Bim: Guardian of Tissue Homeostasis and Critical Regulator of the Immune System, Tumorigenesis and Bone Biology

REVIEW

Abstract

One of the most important roles of apoptosis is the maintenance of tissue homeostasis. Impairment of apoptosis leads to a number of pathological conditions. In response to apoptotic signals, various proteins are activated in a pathway and signal-specific manner. Recently, the pro-apoptotic molecule Bim has attracted increasing attention as a pivotal regulator of tissue homeostasis. The Bim expression level is strictly controlled in both transcriptional and post-transcriptional levels. This control is dependent on cell, tissue and apoptotic stimuli. The phenotype of Bim-deficient mice is a systemic lupus erythematosus-like autoimmune disease with an abnormal accumulation of hematopoietic cells. Bim is thus a critical regulator of hematopoietic cells and immune system. Further studies have revealed the critical roles of Bim in various normal and pathological conditions, including bone homeostasis and tumorigenesis. The current understanding of Bim signaling and roles in the maintenance of tissue homeostasis is reviewed in this paper, focusing on the immune system, bone biology and tumorigenesis to illustrate the diversified role of Bim.

Keywords

Bim Apoptosis Tissue homeostasis Immune system Tumorigenesis Bone biology 

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Copyright information

© L. Hirszfeld Institute of Immunology and Experimental Therapy, Wroclaw, Poland 2011

Authors and Affiliations

  1. 1.Department of Orthopaedic Surgery, Saitama Medical CenterJichi Medical UniversitySaitamaJapan
  2. 2.Department of Orthopaedic Surgery, Faculty of MedicineThe University of TokyoTokyoJapan

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