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Oncotarget, Advance Publications 2015
Cerdulatinib, a novel dual SYK/JAK kinase inhibitor, has broad
anti-tumor activity in both ABC and GCB types of diffuse large B
cell lymphoma
Jiao Ma1, Wei Xing2, Greg Coffey3, Karen Dresser2, Kellie Lu4, Ailin Guo5, Gordana

Raca6, Anjali Pandey3, Pamela Conley3, Hongbo Yu2, Y. Lynn Wang5
Department of Pathology and Laboratory Medicine, Weill Cornell Medical College, New York, NY
2Department of Pathology, University of Massachusetts Memorial Medical Center and Medical School, Worcester, MA
3Department of Biology, Portola Pharmaceuticals, Inc., South San Francisco, CA
4University of Chicago Laboratory School, Chicago, IL
5Department of Pathology, Division of Genomic and Molecular Pathology, University of Chicago, Chicago, IL
6Department of Medicine, University of Chicago, IL
Correspondence to: Y. Lynn Wang, e-mail: [email protected]
Keywords: diffuse large B cell lymphoma, cerdulatinib, SYK, JAK-STAT, molecularly targeted therapy
Received: May 27, 2015 Accepted:

October 23, 2015 Published: November 05, 2015
B-cell receptor (BCR) and JAK/STAT pathways play critical roles in diffuse large
B-cell lymphoma (DLBCL). Herein, we investigated the anti-lymphoma activity of
cerdulatinib, a novel compound that dually targets SYK and JAK/STAT pathways. On a
tissue microarray of 62 primary DLBCL tumors, 58% expressed either phosphorylated
SYK or STAT3 or both. SYK and STAT3 are also phosphorylated in a panel of eleven
DLBCL cell lines although ABC and GCB subtypes exhibited different JAK/STAT
and BCR signaling profiles. In both ABC and GCB cell lines, cerdulatinib induced
apoptosis that was associated with caspase-3 and PARP cleavage. The compound
also blocked G1/S transition and caused cell cycle arrest, accompanied by inhibition
of RB phosphorylation and down-regulation of cyclin E. Phosphorylation of BCR
components and STAT3 was sensitive to cerdulatinib in both ABC and GCB cell lines
under stimulated conditions. Importantly, JAK/STAT and BCR signaling can be blocked
by cerdulatinib in primary GCB and non-GCB DLBCL tumor cells that were accompanied
by cell death. Our work provides mechanistic insights into the actions of cerdulatinib,
suggesting that the drug has a broad anti-tumor activity in both ABC and GCB DLBCL,
at least in part by inhibiting SYK and JAK pathways.

demand for the development of more effective therapies based on the understanding of molecular pathogenesis.
Diffuse large B-cell lymphoma (DLBCL) is the Aberrant B-cell receptor (BCR) signaling is most common type of non-Hodgkin lymphoma (NHL) implicated in B-cell malignancies including DLBCL. and accounts for approximately 40% of all NHL cases. The BCR complex consists of surface immunoglobulins The tumor progresses rapidly and treatment is normally (sIg) that bind antigen in association with disulfide-linked initiated immediately after a patient is diagnosed with the heterodimer CD79A and CD79B proteins [1]. Upon antigen disease. The standard chemoimmunoregimen, rituximab, binding, the conformational change of sIg transduces cyclophosphamide, doxorubicin, vincristine and the signal to the cytoplasmic portions of CD79A/B and prednisone (R-CHOP), is effective in 60% of patients, results in the phosphorylation of the immunoreceptor but nearly 50% of patients treated with R-CHOP will tyrosine-based activation motif (ITAM) by SRC-family eventually progress and relapse. The death rate of DLBCL protein tyrosine kinase LYN. Phosphorylation of ITAMs remains at approximately 30%. Thus, there is an urgent then recruits cytosolic tyrosine kinase SYK and causes its phosphorylation and activation. SYK then triggers From a clinical perspective, targeting the BCR activation of the PI3K-AKT and BTK-PLCγ2 pathways pathway, however, has met with limited success in with the subsequent generation of inositol triphosphate DLBCL patients compared to patients with other types (IP ) and diacylglycerol (DAG). This event is followed by of NHL and chronic lymphocytic leukemia (CLL). activation of multiple distal signaling pathways for B-cell Fostamatinib, a SYK inhibitor, produced an objective activation, such as RAS-MAPK pathway, PKC activation response in 5 of 23 (22%) relapsed/refractory (R/R) and formation of CARD11/BCL10/MALT1 complex, and DLBCL patients in a phase I/II study [15]. Enzastaurin, subsequent NFκB activation [1].
a PKCβ inhibitor, produced 3 complete responses and The first evidence that dysregulated BCR activation 1 stable disease in 55 R/R patients [16]. As to ibrutinib, is a major contributor to DLBCL pathogenesis came from a BTK inhibitor, in a phase II study of 80 R/R DLBCL, gene expression profiling analysis. Based on relatedness of only 37% ABC and 5% GCB subtypes were responsive gene expression profiles to normal B-cell subsets, DLBCL and the response rate of all DLBCL tumors was 19% [17]. were classified into three cell-of-origin subtypes: germinal Genetic analysis revealed that mutation in MYD88 can center B-cell (GCB) subtype, activated B-cell (ABC) subtype nullify the effect of BCR signaling blockade via Toll-like- and primary mediastinal B-cell lymphoma (PMBL) [2–5].
receptor (TLR) signaling pathway leading to downstream Subsequent studies revealed that different signaling NF-κB activation [17]. In addition, gain-of-function pathways are involved in these distinct subtypes of DLBCL mutations in downstream CARD11 and A20 can drive the [6]. The main molecular and genetic abnormalities in constitutive activation of the NF-κB pathway irrespective GCB DLBCL include activation of PI3K/AKT/mTOR of upstream BTK blockade. The complexity of molecular pathway, BCL2 translocations, and BCL6 rearrangements and genomic alterations in DLBCL has severely limited and overexpression, MYC rearrangements, and EZH2 the effectiveness of single-targeted therapy, thus the mutations; while ABC DLBCL is featured with the combination of targeted agents or multi-targeted agents activation of BCR, NF-κB and JAK-STAT pathways have greater appeals in improving treatment response in with associated mutations in genes including CD79A/B, CARD11, TNFAIP3 (A20) and MYD88. For PMBL DLBCL, The Janus kinase and Signal Transducer and key molecular abnormalities include CIITA translocations, Activator of Transcription (JAK-STAT) pathway amplification of REL, amplification of chromosome represents another important signaling pathway in the region 9p24 containing PD-L1, PD-L2 and JAK2 loci, and pathogenesis of DLBCL. One mechanism of STAT3 activation of NF-κB pathways [3, 7, 8]. These molecular activation in ABC DLBCL (or non-GCB) has been defined. subtypes are clinically relevant as patient outcomes and STAT3 is both overexpressed and activated primarily as responses to chemoimmunotherapeutic regimens are a function of autocrine secretion of IL-6/IL-10 by tumor different: GCB DLBCL has much higher response rate than cells [18], a survival mechanism that can be promoted in ABC subtype to R-CHOP, while most of PMBL DLBCL the context of mutations that drive NF-κB activation and can be cured with DA-EPOCH-R regimen [6].
subsequent NF-κB-mediated cytokine expression [19]. In Additional information regarding the molecular addition, it is possible that non-tumor cells of the tumor features of DLBCL was revealed by analysis of gene microenvironment promote malignant cell survival in expression profiles with consensus clustering which part via paracrine cytokine secretion [20, 21]. Clinically, groups lymphomas by functional relatedness of genes STAT3 activation, as reflected by STAT3 phosphorylation [9]. This analysis also identified three groups: BCR/ has been associated with worse survival in patients treated proliferation, OxPhos, and Host response. The BCR group with R-CHOP [22]. In vitro inhibition of STAT3 activity is featured with high expression of SYK mRNA along with with either JAK inhibitors or STAT3 knockdown results mRNA of other BCR pathway components. Concordance in decreased cell proliferation and increased apoptosis in between the cell-of-origin and consensus clustering ABC tumor cell lines [18, 23]. Moreover, early clinical schemes, however, is poor. A common molecular feature studies suggest that targeting JAK/STAT pathways using identified is the increased BCR signaling in a significant small molecule JAK inhibition [24], STAT3 knock down fraction of DLBCL patients, ABC-DLBCL by cell-of- (Hong DS, et al. 2013 ASCO annual meeting abstract origin scheme and BCR-DLBCL by consensus clustering #8523), or a neutralizing antibody specific for IL-6 [25] scheme. These studies provide a strong rationale to target may be beneficial for patients with B-cell malignancies.
BCR signaling in DLBCL.
Thus, literature evidence provides a strong rationale Previously, several groups including ours have to target both BCR and JAK-STAT pathway in DLBCL. explored the potential of inhibiting BCR pathways in Cerdulatinib (previously known as PRT062070) is a novel DLBCL cell lines and primary tumor cells [10–14]. We orally available small-molecule ATP-competitive inhibitor showed that targeting LYN [12] or SYK [13] inhibits BCR that demonstrates inhibition of SYK, JAK1, JAK2, JAK3, signaling and cell proliferation in a subset of DLBCL. and TYK2 in a biochemical assay [26] (Table 1). However, Shipp's group further demonstrated the cells responding to at the cellular level, cerdulatinib demonstrates specificity SYK inhibition carry the BCR signature with either high towards JAK1/JAK3 and TYK2, but not JAK2-mediated or low NFκB activity [14].
responses. The specificity of cerdulatinib was also Table 1: Activity of cerdulatinib against selected kinases, and their expression in normal LN and
IC50 (nM)
Expression in normal lymph node*
Expression in primary lymphoma tissue*
Medium to High
Medium to High
Mostly High
Low to Medium
Low to Medium
Low to Medium
Medium to High
Mostly High
Medium to High
Mostly High
ND: Not detected. N/A: Not Available.
*Tissue microarray data adapted from the human protein atlas website at: IC data were derived from Coffey G, et al. [26].
demonstrated by its lack of inhibition of T cell receptor refractory CLL and B cell non-Hodgkin lymphoma (NHL; signaling or protein kinase C signaling in whole blood NCT01994382). Initial clinical results have demonstrated [26]. In animal models, the agent reduces inflammation good tolerability, significant inhibition of SYK and JAK, in a rat model of autoimmune disease, and blocks B-cell and greater than 50% target tumor reductions in patients activation and alleviates splenomegaly induced by chronic with CLL and NHL (Flinn I, et al. 2015 ASCO annual BCR stimulation in mice [26]. Notably, in primary CLL meeting Abstract #8531). Herein, we further characterize cells with the BTKC481S mutation, cerdulatinib is able to antitumor activities of cerdulatinib in subtypes of DLBCL overcome ibrutinib resistance by completely blocking the cell lines and primary tumor cells. The results suggest proliferation of the resistant cells [27–29]. Cerdulatinib cerdulatinib exerts broad anti-tumor activity in both ABC is currently under investigation as a single orally and GCB DLBCL including cells with resistance to BCR- administered agent in a dose escalation study in relapsed/ targeted therapy.
sites (LY3, DHL2 and LY10). In contrast, little total or phosphorylated STAT3 proteins were detected in the six GCB cell lines. The immunoblotting also revealed some STAT3 and SYK are active in an array of
interesting findings regarding all the GCB and HBL1 cell primary DLBCL tissues of both GCB and
lines. Although the expression and phosphorylation of SYK, PLCγ2 and ERK and total AKT levels are variable among the cell lines, in general, all GCB appear to To determine whether simultaneous targeting of express higher levels of p-SYK, p-PLCγ2 (at both Y759 both JAK/STAT and SYK is relevant in DLBCL, we and Y1217) and p-AKT suggesting downstream BCR examined the expression of p-STAT3 (Y705) and p-SYK activity is more active in these cell lines. Among five (Y525/526) on a tissue microarray of 62 DLBCL primary ABC cell lines, HBL1 cell line appears to be the only one tumors, including 41 germinal center-like (GCB) and 21 that expresses high levels of p-PLCγ2 (Figure 2). Taken non-germinal-center-like (non-GCB) tumors classified together with Figure 1, active forms of SYK and JAK are using Han's algorithm [30] (Figure 1). p-STAT3 exhibits expressed in a wider range of DLBCL tumors than each of a characteristic nuclear staining pattern in DLBCL cases the single molecule alone.
(Figure 1A). Patterns other than nuclear were excluded as positive staining. p-STAT3 staining in tonsil is included Both ABC and GCB subtypes of DLBCL are
as control (Figure 1 A-d). A total of 26 (26/62, 42%) sensitive to dual SYK/JAK inhibition with
stained positive for nuclear p-STAT3; 16 were GCB type (16/41, 39%) and 10 were non-GCB type (10/21, 48%, Figure 1B). p-SYK expression was detected in 29 (29/62, Cerdulatinib is an orally available ATP-competitive 47%) cases with a characteristic peri-membrane staining small molecule kinase inhibitor currently in clinical pattern (Figures 1A and 1B). Patterns other than peri- development for the treatment of B-cell malignancies membrane were excluded as positive staining. p-SYK (NCT01994382). Early clinical results (Flinn I, et al. 2014 staining in tonsil is included as control (Figure 1A-h). ASCO annual meeting Abstract #2619) suggest that high While occasionally germinal centers were found to contain level of SYK and JAK inhibition is achieved in treated a few scattered p-SYK positive cells, most of the germinal patients, with an acceptable safety profile. In biochemical centers in the tonsil are completely negative for p-SYK. Of assays, cerdulatinib demonstrated inhibitory activity these 29 p-SYK positive cases, 17 were GCB type (17/41, against 24 kinases with IC 's < 200 nM (Table 1). Most 41%) and 12 were non-GCB type (12/21, 57%, Figure of the kinases affected by cerdulatinib are not expressed at 1B). Interestingly, there are 19 cases (19/62, 31%) among all, or expressed at very low levels in normal lymph nodes the total 62 cases with reactivity for both p-SYK and and primary lymphoma tissues. Seven of these affected p-STAT3, of which, 11 were GCB type (11/41, 27%) and kinases are notably expressed including AMPK, JAK2, 8 were non-GCB type (8/21, 38%, See Figure 1B for case TBK1, JAK1, RSK4, SYK, and FLT3 (Bold in Table 1). numbers and Figure 1C for percentage breakdown). These Cerdulatinib inhibits SYK and JAK1 with IC 's of 32 nM data are consistent with the single stain results published and 12 nM, respectively. A recent publication detailing the previously on p-STAT3 by Huang et al [22] and on p-SYK translation of biochemical assays to cellular potency and by our group [13]. Together, these findings demonstrated selectivity revealed that cerdulatinib principally acted as a that SYK and STAT3 are active in a significant number of SYK, JAK1/3, and TYK2 inhibitor, lacking cellular activity DLBCL cases (Figure 1C).
against JAK2, against the SRC family members LCK and LYN, as well as the structural homolog ZAP70 [26]. STAT3 and SYK are active in a panel of DLBCL
Potency against AMPK, TBK1, RSK family members, and cell lines of both GCB and ABC subtypes
FLT3 has not been determined in cellular assays.
We next investigated the activity of cerdulatinib in We then determined the basal expression levels the panel of DLBCL cell lines. A cell-based MTT assay of BCR signaling and JAK/STAT signaling molecules that reflects cellular metabolic activity was performed and their phosphorylation status in a panel of GCB and at 72 h following treatment with cerdulatinib at varying ABC DLBCL cell lines using immunoblotting analysis. concentrations (Figure 3A). All cell lines demonstrated The cell lines studied include six GCB cell lines: OCI- sensitivity to cerdulatinib with IC at or below 2 μM LY1 (LY1), OCI-LY4 (LY4), OCI-LY8 (LY8), OCI-LY18 (data compiled in Figure 3B). Notably, ABC cell lines (LY18), SUDHL6 (DHL6) and VAL, and 5 ABC cell with relatively higher total and phosphorylated STAT3 lines: OCI-LY3 (LY3), SUDHL2 (DHL2), HBL1, U2932 (Figure 2) displayed good sensitivity to the drug with and OCI-LY10 (LY10). As shown in Figure 2, three of IC ranging from 0.29 to 1.80 μM (Figure 3B). Of these the five ABC cell lines exhibited very high levels of ABC cell lines, LY3 and DHL2 were insensitive to a total and phosphorylated STAT3 at both Y705 and S727 SYK selective inhibitor, PRT060318, as demonstrated

Figure 1: Expression of p-STAT3 (Y705) and p-SYK (Y525/526) in normal tonsil and primary DLBCL tissues on tissue
microarray. A. Expression of p-STAT3 (a-d) and p-SYK (e-h) was examined by immunohistochemistry on paraffin-embedded sections
from DLBCLs (a-c and e-g) and normal tonsil tissue (d and h). a. A representative example of strongly positive p-STAT3 staining (60–90%
lymphoma cells). b. A representative example of weakly positive p-STAT3 staining (30–50% lymphoma cells). c. A representative example
of negative p-STAT3 staining (<30% lymphoma cells). d. Basal level of p-STAT3 expression in normal tonsil tissue with scattered positive
cells in germinal center. e. A representative example of strongly positive p-SYK staining (60–90% lymphoma cells). f. A representative
example of weakly positive p-SYK staining (30–50% lymphoma cells). g. A representative example of negative p-SYK staining (<30%
lymphoma cells). h. Absence of p-SYK positivity in normal tonsil tissue. (a-h, x1,000). B. Table showing the number breakdown of p-SYK
and p-STAT3 staining in all, GCB or non-GCB cases. C. Pie charts showing the percent breakdown of p-SYK and p-STAT3 staining in all,
GCB or non-GCB cases.

in our previous study [13]. LY4, a GCB cell line, was and LY18) and three ABC (HBL1, SUDHL2 and LY3) cell also resistant to the selective SYK inhibition due to lack lines, which were characterized further below.
of surface immunoglobulins [13]. The cell line was, however, sensitive to dual inhibition by cerdulatinib with Cerdulatinib induces apoptosis in both GCB and
an IC of 2.1 μM. Early clinical results suggest that these ABC subtypes of DLBCL cell lines via caspase 3
concentrations can be safely achieved in the plasma of and PARP cleavage
treated patients (Flinn I, et al. 2014 ASCO annual meeting Abstract #2619). Overall, the results demonstrate potent The effects of cerdulatinib on cellular metabolism and broad activity of cerdulatinib in DLBCL cell lines. (MTT) can result from either cell death or cell cycle Sensitivity to cerdulatinib was confirmed in an independent inhibition or both. We therefore analyzed the effects of cell growth assay (Figure 3C) utilizing two GCB (SUDHL6 cerdulatinib on DLBCL cell viability. Using annexin V Figure 2: Distinct signaling pathways in GCB-DLBCL vs ABC-DLBCL cell lines. Western blotting analysis of the basal
levels of total and phosphorylated STAT3, SYK, PLCγ2, AKT and ERK in GCB and ABC DLBCL cell lines. Phosphorylated residues for each protein are indicated. β-actin was included as a loading control.

Figure 3: Both ABC and GCB subtypes of DLBCL are sensitive to dual SYK/JAK inhibition with cerdulatinib. A.
DLBCL cell lines were treated with various concentrations of cerdulatinib for 72 h followed by MTT assay. GCB are highlighted in blue and ABC in red. B. IC values were calculated using GraphPad Prism 5 software (GraphPad, La Jolla, CA). C. DLBCL cell lines were
treated with indicated concentrations of cerdulatinib for up to 72 h. Cell numbers were determined at indicated time points and normalized to vehicle treated control. Error bars represent the standard error of the mean (SEM) from three independent experiments.

and 7-AAD double staining, we demonstrated that with Cell cycle arrest by cerdulatinib is associated
the exception of LY18, viability of all cell lines was with inhibition of RB phosphorylation and
reduced by cerdulatinib treatment in a concentration- and down-regulation of cyclin E
time-dependent manner (Figure 4A). Apoptosis induction with increasing concentrations of cerdulatinib in the four After establishing apoptosis induction as one of the responding cell lines was accompanied by both PARP and drug's actions, we then studied the effect of cerdulatinib caspase 3 cleavage whereas little changes were observed on cell cycle progression using BrdU incorporation. As in LY18 (Figure 4B).
shown in Figure 5A, DHL6, LY18 and HBL1 appeared Figure 4: Cerdulatinib induces apoptosis in both GCB and ABC subtypes of DLBCL cell lines via caspase 3 and PARP
cleavage. A. Viability of DLBCL cells treated with various doses of cerdulatinib for up to 72 h. Cells were collected at indicated time
points, and stained with annexin V and 7-AAD. Cell viability was measured using flow cytometry, and shown as the percent viable cells (annexin V-/7-AAD-) relative to vehicle treated control. Error bars represent the SEM from three independent experiments. B. DLBCL cells
were treated with indicated doses of cerdulatinib for 48 h. Western blotting was performed using antibodies against PARP and caspase 3. β-actin was included as a normalization control.

to be particularly sensitive to cerdulatinib treatment with cerdulatinib to inhibit cell cycle and induce apoptosis significant dose-dependent reduction in S phase fraction, under the condition of BCR stimulation. Figure 6A shows while the effects of the drug on DHL2 and LY3 were that BCR stimulation with anti-IgM and anti-IgG drove modest in comparison. The dose-dependent S-phase more cells into S-phase in all five cell lines regardless of reductions caused by the drug are largely consistent with subtypes and these stimulated tumor cells were sensitive its inhibition of phosphorylated RB and with decrease in to cerdulatinib treatment. Similarly, the viability of cyclin E expression (Figure 5B): While bigger changes stimulated DLBCL cells were reduced by cerdulatinib in were observed in HBL1, SUDHL6 and LY18, little all cell lines tested (Figure 6B). Taken together with the or no changes were observed in SUDHL2 and LY3. results under the resting conditions (Figure 4A and 5A), Collectively, our data on apoptosis (Figure 4) and on cell we conclude that cerdulatinib achieves its anti-tumor cycle progression (Figure 5) suggests that cerdulatinib effects in ABC and GCB DLBCL cell lines via induction achieves its inhibitory effects in different DLBCL cell of apoptosis and cell cycle arrest with or without external lines (Figure 3A and 3B, MTT assay) via different cellular processes, either induction of apoptosis or induction of cell cycle arrest.
Cerdulatinib blocks JAK/STAT and BCR
signaling in both ABC and GCB DLBCL cell
Cerdulatinib induces apoptosis and cell cycle
arrest in BCR-stimulated DLBCL cells
To determine whether cerdulatinib inhibits BCR Since the BCR pathway may be chronically active and JAK-STAT signaling pathways, we first measured in many DLBCL, we next examined the capability of the phosphorylation of SYK, PLCγ2, AKT and ERK in Figure 5: Cerdulatinib blocks cell cycle in both ABC and GCB subtypes of DLBCL via inhibition of RB phosphorylation
and down-regulation of cyclin E. A. DLBCL cells were treated with indicated doses of cerdulatinib for 48 h. Cells were labeled with
10 μM BrdU for 2 h, followed by double staining with BrdU antibody and 7-AAD prior to flow cytometry analysis. Percentage of cells at S phase was statistically analyzed using one-way ANOVA test and graphed using prism 5 GraphPad. Error bars represent the SEM from three independent experiments. *p < 0.05; **p < 0.01; ***p < 0.005. B. DLBCL cells were treated with indicated concentrations of cerdulatinib.
The whole cell lysates were prepared at 48 h following treatment. Immunoblotting was performed using p-RB and cyclin E antibodies. β-actin was included as a loading control.

BCR-stimulated DLBCL cells treated with or without was observed: SYK, PLCγ2, AKT and ERK in DHL6; cerdulatinib (Figure 7A). Immunoblotting analyses SYK, PLCγ2 and AKT in LY18; SYK and AKT in HBL1, revealed a significant reduction of p-SYK in all cell lines, SYK in DHL2; and SYK, AKT and ERK in LY3. Thus, reduction of p-PLCγ2 in the two GCB cell lines (DHL6 despite the variability, at least one signaling component of and LY18), reduction of p-AKT in four of the five cell the BCR pathway was effectively inhibited by cerdulatinib lines (except DHL2) and reduction of p-ERK in two of the in each individual cell line.
five cell lines (DHL6 and LY3). When analyzing data by We also determined whether cerdulatinib inhibits individual cell lines, reduction in protein phosphorylation the JAK-STAT signaling pathways under the condition of Figure 6: Cerdulatinib induces cell cycle arrest and apoptosis under the condition of BCR stimulation in all DLBCL
cell lines. A. DLBCL cells were treated with 3 μM of cerdulatinib for 48 h and labeled with 10 μM BrdU for 2 h, followed by double
staining with BrdU antibody and 7-AAD prior to flow cytometry analysis. B. Following 48 hr drug treatment, cells were stained with
annexin V and 7-AAD. Percentage of viable cell relative to vehicle control or cells at S phase was statistically analyzed using one-way ANOVA test and graphed using prism 5 GraphPad. Error bars represent the SEM from three independent experiments. *p < 0.05; **p < 0.01; ***p < 0.001.

cytokine stimulation. Cells stimulated with IL-6 and IL-10 cellular toxicity in terms of cell survival and proliferation were treated with cerdulatinib or vehicle, phosphorylation of STAT3 at Y705 was measured. As shown in Figure 7B, cytokine stimulated cells expressed very high levels Cerdulatinib induces cell death in primary
of p-STAT3 regardless of subtype designation. Addition human DLBCL samples
of cerdulatinib completely blocked this phosphorylation event to a level that goes below the detection level. Thus, To confirm whether data obtained with the cell lines we conclude that modulation of both BCR and JAK-STAT are reproducible with primary patient tumors, we tested signaling pathways by cerdulatinib correlated with its several human DLBCL samples, including 3 GCB, 2 non- Figure 7: Cerdulatinib blocks JAK/STAT and BCR signaling in both ABC and GCB DLBCL cell lines. DLBCL cells were
treated with 3 μM of cerdulatinib for 30 min, and then stimulated with either anti IgM/IgG or IL6/IL10 for 24 h before cell collection and lysate preparation. Immunoblotting analysis of A. p-SYK, p-PLCγ2, p-AKT, p-ERK expressions and B. p-STAT3 expression in selected
DLBCL cell lines. β-actin was included as a loading control.
GCB and one unclassified (patient information shown and JAK inhibition (Table 1), the data presented herein in Supplemental Table 1), for their apoptotic response with DLBCL cell lines and primary tumors are at least to 0.5 μM and 1 μM cerdulatinib. As shown in Figure consistent with the hypothesis that SYK and JAK 8A, all primary DLBCL cells responded to cerdulatinib inhibition contributes to the antitumor activities of the in a concentration-dependent manner with variable drug. Target selectivity of cerdulatinib was demonstrated previously in different cell types of normal human whole We next studied the inhibition of p-STAT3, p-ERK blood as well. The compound potently inhibit BCR and and p-AKT in response to cerdulatinib treatment in these FcR-induced SYK activation and cytokine receptor- primary patient cells stimulated with anti-BCR. Phospho- induced JAK1/3 and JAK1/TYK2 activation in B cells, flow assay demonstrated a marked and simultaneous T cells and monocytes while it does not inhibit protein down-regulation of p-STAT3, p-AKT and p-ERK in kinase C-mediated PMA signaling or LCK and ZAP70– response to increasing concentrations of cerdulatinib in mediated T cell antigen receptor signaling, or JAK2- all six primary DLBCL cells regardless of their subtype mediated GM-CSF signaling. [26] designation (Figures 8B, 8C and 8D), but inhibition of the Cerdulatinib demonstrated broader anti-tumor individual protein phosphorylation was highly variable activity relative to several BCR-specific inhibitors among these primary samples. For instance, DLBCL3 we have evaluated. Previously, we have shown that showed no significant inhibition in p-STAT3 in response dasatinib (targets mainly SRC family kinases at low to increasing concentrations of cerdulatinib, presumably concentrations) and PRT318 (highly specific for SYK) due to its very low baseline p-STAT3 level in untreated exert anti-tumor activity primarily by affecting cell cycle cells compared to the other patient samples (Figure 8B). with minimal impact on cell viability [12, 13]. However, DLBCL1 and DLBCL4 had little to no suppression of with cerdulatinib, we observed apoptosis induction in p-ERK activity upon cerdulatinib treatment (Figure 8D). addition to cell cycle inhibition (Figures 4–6) although These results are similar to those observed in cell lines the specific cellular effect varied from cell line to cell (Figure 7) suggesting individual patient samples may line. These data suggest that simultaneous inhibition of rely upon different signaling pathways. Interestingly, multiple therapeutically relevant targets, such as combined a significant linear correlation was found between the SYK and JAK, may represent a more effective approach degree of p-ERK inhibition and the extent of cell death compared to single target-directed agent.
response (Figure 8E, left, p = 0.0117). Meanwhile, no It is also noteworthy that many cell lines resistant significant linear correlation was identified between the to BCR-targeted inhibitors were sensitive to cerdulatinib. extent of p-AKT inhibition and the cell death response Among the cell lines studied, LY3 carries an activating (Figure 8F, right, p = 0.2142). The results suggest that mutation in CARD11 [31] (Supplemental Table 2); LY3, indirect inhibition of downstream ERK phosphorylation LY10, U2932 (ABC) along with LY8, VAL, and SUDHL2 by cerdulatinib may play a role in the final cellular (GCB) carry inactivating mutations or hemizygous outcome, and ERK inhibition may mediate the therapeutic deletion in TNFAIP3 (A20), which negatively regulates effects of cerdulatinib.
NFκB activity. Loss of A20 function results in constitutive activation of NFκB that promotes tumor growth and survival. ABC cell lines, HBL1, LY3, LY10 and SUDHL2, along with GCB cell line SUDHL6 all carry activating Available clinical data indicate that BCR-directed MYD88 mutations, which promote IRAK1/4 and TRAF6 inhibitors such as SYK (fostmatinib), BTK (ibrutinib) dimerization and subsequent NFκB activation.
and PKCβ (enzastaurin) are active in ≤ 20% of DLBCL The ultimate activation of NFκB, resulting from patients. This highlights the need to continue exploring these BCR-associated or MYD88 mutations, leads novel agents with expanded activities in this disease. to increased IL6 and IL10 autocrine secretion that In this study, we first demonstrated the presence of subsequently activates JAK-STAT3 pathway to enhance active SYK and JAK in their phosphorylated forms in cell survival and proliferation. This perhaps represents a significant fraction of DLBCL primary tumor tissues one of several mechanisms rendering tumor cells resistant and cell lines. We then showed that cerdulatinib, a to inhibitors of early BCR components. As a matter potent inhibitor of SYK and JAK, has broad anti-tumor of fact, high levels of baseline phosphorylated STAT3 activity as demonstrated by inhibition of 1) cellular exhibited in the ABC cell lines (Figure 2) may be a result metabolic function, 2) cell viability, 3) cell cycling, 4) of the BCR/MYD88 mutations they carry. Cerdulatinib, signal transduction through SYK-PLCγ2-AKT or ERK, with its ability to inhibit p-STAT3 in both cell lines and and 5) signal transduction through JAK-STAT. We primary tumors, provides another point of blockade after further demonstrated that cerdulatinib induced cell death NFκB activation. Antitumor activities were achieved by in primary DLBCL cells and the degree of cell death cerdulatinib in all cell lines carrying mutations including significantly correlated with decreased p-ERK.
ABC cell lines HBL1 (MYD88), LY3 (CARD11, A20 and While the broad activity of cerdulatinib in DLBCL MYD88), LY10 (A20 and MYD88), SUDHL2 (A20 and cell lines may be ascribed to mechanisms beyond SYK MYD88), and U2932 (A20) as well as GCB cell lines LY8

Figure 8: Primary DLBCL cells are sensitive to dual SYK/JAK inhibition. A. Six primary human DLBCL samples were
treated with 0.5 μM or 1 μM cerdulatinib for 72 h. Cell viability was measured by MTT assay, and normalized to vehicle control. Primary human DLBCL samples were treated with 0.5 μM or 1 μM cerdulatinib for 6 h followed by stimulation with 5 μg/ml IgM/IgG for 15 min at 37°C. Phospho-flow assays were performed to determine the levels of p-STAT3 in B, p-AKT in C and p-ERK in D in the primary cells.
Error bars represent the SEM from three independent experiments. *p < 0.05, **p < 0.01, ***p < 0.001, ****p < 0.0001. E. Relationship
between cell death following treatment with 1 μM cerdulatinib and percent inhibition of ERK1/2 was analyzed by Spearman correlation. F. Relationship between cell death and percentage of inhibition of AKT was statistically analyzed using one-way ANOVA test. Percent
inhibition of phosphorylation was calculated using the formula: [(MFI (A20), SUDHL6 (MYD88) and VAL (A20) (Supplemental Table 2), likely by blocking the up-regulation of STAT3 activity induced by the sequential events of BCR/MYD88 The study included 62 DLBCL samples in two tissue microarrays from 2000–2011. Twenty-five cases were STAT. In particular, not only high levels of baseline from nodal sites and 37 from extranodal sites. Only tumors phosphorylated STAT3 exhibited in the ABC cell lines with enough tissues were included. Immunohistochemical render these cells very sensitive to cerdulatinib inhibition, stains of p-STAT3 (Y705, rabbit monoclonal Ab, clone but also cytokine-induced STAT3 phosphorylation in D3A7, Cell Signaling) and p-SYK (Y525/526; rabbit GCB cell lines (Figure 7B). Notably, some of these cell polyclonal Ab; Cell Signaling) were performed and the lines, LY3 in particular, was shown to be highly resistant results were evaluated by proportion of lymphoma cells to inhibition of SRC, SYK and BTK [10]. In the clinical that were stained. The antibody reactivity in ≥ 30% of trial setting, patients with mutations in CARD11, A20 the lymphoma cells was considered positive. Paraffin- and MYD88 indeed demonstrated resistance to ibrutinib, embedded normal tonsil tissue was included as a baseline a BTK inhibitor [17]. In addition to BCR inhibitor- expression level for p-STAT3 and p-SYK.
resistant DLBCL, cerdulatinib (PRT2070) also has the capability to overcome ibrutinib resistance in CLL cells Immunoblotting assays and antibodies
carrying BTKC481S mutation [28, 29]. These data suggest that simultaneous inhibition of multiple therapeutically Immunoblotting were performed as previously relevant targets, such as combined SYK and JAK, may described [32]. Antibodies including total STAT3, represent a more effective approach for the treatment of SYK, PLCγ2, AKT, ERK1/2, PARP, caspase 3, and B-cell lymphoma.
phosphorylated STAT3 (S727), STAT3 (Y705), SYK (Y525/526), PLCγ2 (Y759), PLCγ2 (Y1217), AKT (S473), ERK1/2 (Y204) and RB (S807/811) were purchased from MATERIALS AND METHODS
Cell Signaling (Danvers, MA). Cyclin E antibody was purchased from Santa Cruz Biotechnology (Dallas, TX), and β-actin antibody was purchased from Sigma-Aldrich Cell lines, primary cells and culture conditions
(St Louis, MO). Antibodies used in phosphoflow assay, GCB cell lines OCI-LY1, OCI-LY4, OCI-LY8, including phosphorylated STAT3 (S727), SYK (Y525/526), OCI-LY18, SUDHL6 and VAL were cultured in Iscove's PLCγ2 (Y759), AKT (S473), and ERK1/2 (Y204) were Modified Dulbecco's Medium (IMDM) supplemented purchased from BD Biosciences (San Jose, CA).
with 20% Fetal Bovine Serum (FBS) and 100 μg/mL penicillin/streptomycin. ABC cell lines SUDHL2 and Cell metabolic activity, cell growth and viability
HBL1 were cultured in RPMI1640 supplemented with 20% FBS and 100 μg/mL penicillin/streptomycin. OCI- LY3 cells were grown in RPMI1640 supplemented DLBCL cell lines were treated with various with 20% FBS, 100 μg/ml penicillin/streptomycin concentrations of cerdulatinib for up to 72 h. The and HEPES. ABC cell lines OCI-LY10 was cultured metabolic activities of cells were determined with MTT in Iscove's Modified Dulbecco's Medium (IMDM) assay according to manufacturer's instruction (Roche supplemented with 20% human serum and 100 μg/ Applied Science, Indianapolis, IN) at 72 h time point. mL penicillin/streptomycin. ABC cell line U2932 was IC was calculated using the Sigma Plot generated with cultured in high glucose RPMI1640 supplemented GraphPad Prism 6 software (GraphPad, La Jolla, CA). with 20% FBS, 100 μg/ml penicillin/streptomycin. Cell growth was measured at every 24 h counting live All cells were maintained in a humidified 37°C/5% cells with flow cytometry as previously described [12]. CO incubator. Frozen primary DLBCL cells were Cells were collected every 24 h and cell viability was obtained from the tumor bank of the Department of determined by the PE Annexin V Apoptosis Detection Kit Pathology at Weill Cornell Medical College after I (BD Biosciences).
Institutional Review Board review and approval. All primary cells were thawed as previously described Cell cycle analysis
[32] and cultured in above conditions at 37°C for 6 h DLBCL cells were treated with various in the presence or absence of cerdulatinib followed by concentrations of cerdulatinib for 48 h. Cells were incubated BCR stimulations with 5 μg/mL of IgM and IgG. The with 10 μM BrdU (BD Biosciences, San Jose, CA) at 37°C clinical characteristics of these patients are listed in for 2 h, and stained with PE conjugated anti-BrdU antibody the supplemental Table 1. Cerdulatinib [26] was kindly (BD Biosciences) according to the supplier's manual. The provided by Portola Pharmaceuticals Inc. (South San percentage of cell cycle distribution was analyzed with Francisco, CA) and stored as 10 mM stock at −20°C.
FlowJo (Tree Star Inc. Ashland, OR).
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