Bruton's Tyrosine Kinase Cooperates with the B Cell Linker Protein SLP-65 As a Tumor Suppressor in Pre-B Cells

Overview

Journal J Exp Med

Specialties Allergy & Immunology
General Medicine

Date 2003 Jul 2

PMID 12835482

Citations 35

Authors

Rogier Kersseboom

Sabine Middendorp

Gemma M Dingjan

Katarina Dahlenborg

Michael Reth

Hassan Jumaa

Rudolf W Hendriks

Affiliations

Soon will be listed here.

Abstract

Expression of the pre-B cell receptor (pre-BCR) leads to activation of the adaptor molecule SLP-65 and the cytoplasmic kinase Btk. Mice deficient for one of these signaling proteins have an incomplete block in B cell development at the stage of large cycling pre-BCR+CD43+ pre-B cells. Our recent findings of defective SLP-65 expression in approximately 50% of childhood pre-B acute lymphoblastic leukemias and spontaneous pre-B cell lymphoma development in SLP-65-/- mice demonstrate that SLP-65 acts as a tumor suppressor. To investigate cooperation between Btk and SLP-65, we characterized the pre-B cell compartment in single and double mutant mice, and found that the two proteins have a synergistic role in the developmental progression of large cycling into small resting pre-B cells. We show that Btk/SLP-65 double mutant mice have a dramatically increased pre-B cell tumor incidence ( approximately 75% at 16 wk of age), as compared with SLP-65 single deficient mice (<10%). These findings demonstrate that Btk cooperates with SLP-65 as a tumor suppressor in pre-B cells. Furthermore, transgenic low-level expression of a constitutive active form of Btk, the E41K-Y223F mutant, prevented tumor formation in Btk/SLP-65 double mutant mice, indicating that constitutive active Btk can substitute for SLP-65 as a tumor suppressor.

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