Cellular proteolytic modification of tumor-suppressor CYLD is critical for the initiation of human T-cell acute lymphoblastic leukemiaby Mansi Arora, Deepak Kaul, Neelam Varma, R.K. Marwaha

Blood Cells, Molecules, and Diseases


Molecular Biology / Hematology / Molecular Medicine / Cell Biology


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su ob a duca igarh rh 1 itio ults nd of M udy ic c ion ity to program the genome of these cells resulting in T-cell lineage ALL. Based upon crucia tion in

FkB pa nsible get and transcriptional repressor, sustainsNFkB activation by repressing gradient centrifugation method and cultured as described before [9]. ined in the declaration

Blood Cells, Molecules and Diseases xxx (2014) xxx–xxx

YBCMD-01840; No. of pages: 7; 4C:

Contents lists available at ScienceDirect

Blood Cells, Molecu .e l(MALT-1) has recently emerged as the most critical regulator of CYLDmediated NFkB activation in various immune and non-immune cells [6–8]. In this context, the present study was addressed to understand three specific issues: 1) how MALT-1 over-expression within human blood mononuclear cells programs these cells?; 2) does MALT-1 inFurther, the study conforms to the principles outl of Helsinki [10].

Transfectionthe deubiquitinase CYLD [2]. Cylindromatosis (CYLD), a tumor suppressor gene, has been shown to regulate the activity of NFkBwithin human cells. Post-translational modifications of CYLD including phosphorylation, ubiquitination and proteolytic cleavage appear to be critical for its function [3–5]. The para-caspase mucosa associated lymphoid tissue

T-cellswere isolated byMACS separation according to themanufacturer's protocol (Miltenyi Biotec, Germany). Freshly diagnosed T-ALL patient subjects of pediatric age group (n= 15) were employed from the outpatient department (OPD) of Pediatrics of our institute with their prior informed consent and ethical approval by institute's ethical committee.duced CYLD-cleavage govern this transformat

CYLD post-translational modification occur acute lymphoblastic leukemia subjects of pedi ⁎ Corresponding author. Fax: +91 172 2744401.

E-mail address: dkaul_24@hotmail.com (D. Kaul). http://dx.doi.org/10.1016/j.bcmd.2014.07.008 1079-9796/© 2014 Published by Elsevier Inc.

Please cite this article as: M. Arora, et al., Bloukemia [1,2]. It has been 1, a canonical Notch tarprior informed consent ensuring that these subjects had abstained from any medication for 2 weeks before blood donation) using densitydisease known as T-cell acute lymphoblastic le recently demonstrated that Notch through HesCYLD cleavage


Pediatric T-ALL


Several studies have demonstrated a nonical and non-canonical NFkB activa hematological malignancies [1]. Such N downstream of oncogenic Notch-I respo© 2014 Published by Elsevier Inc. l involvement of both cathe evolution of human thways have been found for thymocyte neoplastic

Material and methods

Cell culture

Normal peripheral blood mononuclear cells (PBMCs) were isolated from blood withdrawn from 15 normal healthy volunteers (with theirMALT1 th o ese results, we propose that MALT1 inhibitors may be of crucial importance in the treatment of T-ALL subjects f pediatric age group.Human PBMCs cells had the inherent capacCellular proteolytic modification of tumorthe initiation of human T-cell acute lymph

Mansi Arora a, Deepak Kaul a,⁎, Neelam Varma b, R.K. M a Department of Experimental Medicine & Biotechnology, Post-Graduate Institute of Medical E b Department of Hematology, Post-graduate Institute of Medical Education & Research, Chand c Department of Pediatrics, Post-graduate Institute of Medical Education & Research, Chandiga a b s t r a c ta r t i c l e i n f o

Article history:

Submitted 29 May 2014

Available online xxxx (Communicated by Mohandas Narla, 15 Jul 2014)


There exists a general recogn lytic cleavage byMALT-1 res ed with cancer in general a understand the contribution leukemia (T-ALL). Such a st

MALT-1 mediated proteolyt group. Further, over-express j ourna l homepage: wwwion?; and 3) does similar in T-cells derived from atric age-group? od Cells Mol. Diseases (2014)ppressor CYLD is critical for lastic leukemia rwaha c tion & Research, Chandigarh 160012, India 160012, India 60012, India n of the fact that post translationalmodification of CYLD protein through proteoin sustained cellular NF-kB activity which is conspicuously found to be associathematological malignancies in particular. The present study was directed to

ALT-1 and deubiquitinase CYLD to the initiation of T-cell acute lymphoblastic revealed for the first time that the 35 kDa CYLD cleaved factor generated by leavage was conspicuously present in human T- ALL subjects of pediatric age of this 35 kDa CYLD factor within normal human peripheral blood mononuclear les and Diseases sev ie r .com/ locate /bcmdp3F-Strep-mMALT1 obtained from “Addgene plasmid 33315” [11] was transfected into PBMCs using ESCORT transfection reagent (Sigma) to overexpress MALT1 protein. siRNA against conserved sequence of

MALT1 mRNA (Sigma) was used to knock-down the expression of

MALT1. The sequences corresponding to the MALT1 cleaved CYLD— 35 kDa and 70 kDa, were amplified using specific designed primers and the PCR amplicons were cloned in a pEF6V5His TOPO expression vector , http://dx.doi.org/10.1016/j.bcmd.2014.07.008 2 M. Arora et al. / Blood Cells, Molecules and Diseases xxx (2014) xxx–xxx(Invitrogen) and subsequently transfected into normal human PBMCs followed by maintenance of these cells in vitro culture up to 5 days.

Expression analysis

Transcriptional expression of various genes was analyzed by RT-PCR using gene specific primers. Further the PCR products were run on 2.5% agarose gel and to analyze the relative expression of genes a densitometry scanning of bands was done using scion image analysis software.

Immuno-blot analysis and immuno-precipitation

Cellular protein was extracted and subsequently subjected to SDSPAGE, followed by western blotting and immuno-detection as per the standard procedure [9] using specific antibodies against MALT1, CYLD (Polyclonal and C terminal) and β-actin obtained from Sigma. Cellular immuno-precipitation experiments were done as described previously [9]. In order to verify the status of NFkB activity, the PBMCs transfected with 35 kDa factor were processed for separation of cytoplasmic and nuclear protein fractions. The cells were suspended in buffer containing 250 mM Sucrose, 20mMHEPES (pH 7.4), 10 mMKCl, 1.5 mMMgCl2, 1 mM EDTA, 1 mM EGTA, 1 mM DTT and protease inhibitor cocktail (Sigma) passed through a 25G needle 10 times using a 1 ml syringe and left on ice for 20 min. The nuclear pellet was centrifuged out, washed with buffer and re-suspended in standard lysis buffer with