BIGH3 Promotes Osteolytic Lesions in Renal Cell Carcinoma Bone Metastasis by Inhibiting Osteoblast Differentiation

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Updated: Feb 17, 2026

Models of Bone Metastasis
08:49

Models of Bone Metastasis

Published on: September 4, 2012

43.2K

Tianhong Pan1, Song-Chang Lin2, Kai-Jie Yu3

  • 1Department of Orthopedic Oncology, University of Texas, MD Anderson Cancer Center, Houston, TX, USA.

Neoplasia (New York, N.Y.)
|December 1, 2017
PubMed
Abstract

Insights

Renal cell carcinoma (RCC) bone metastasis causes osteolytic lesions by inhibiting osteoblast differentiation. The protein BIGH3 (Beta ig h3 protein) plays a key role in this bone destruction.

Area of Science:

  • Oncology
  • Orthopedics
  • Molecular Biology

Background:

  • Bone metastasis is a frequent complication of renal cell carcinoma (RCC), characterized by osteolytic lesions.
  • The precise mechanisms underlying bone destruction in RCC bone metastasis remain largely unknown.

Purpose of the Study:

  • To investigate the role of osteoblast differentiation inhibition in the development of osteolytic bone lesions in RCC bone metastasis.
  • To identify potential molecular mediators involved in RCC-induced osteolysis.

Main Methods:

  • Establishment of an in vivo mouse model using direct intrafemoral injection of bone-derived 786-O RCC cells (Bo-786).
  • Assessment of the effect of Bo-786 cell conditioned medium (Bo-786 CM) on osteoblast differentiation in vitro.
  • Secretome analysis of Bo-786 CM to identify key proteins, followed by in vitro and in vivo validation.
  • Immunohistochemical analysis of BIGH3 expression in human RCC bone metastasis specimens.

Main Results:

  • Bo-786 cells induced osteolytic bone lesions in mouse femurs.
  • Bo-786 CM significantly inhibited osteoblast differentiation.
  • BIGH3 (Beta ig h3 protein) was identified as highly expressed in Bo-786 CM and demonstrated to inhibit osteoblast differentiation in vitro.
  • Knockdown of BIGH3 in RCC cells reduced osteoblast differentiation inhibition and ameliorated osteolytic bone lesions in vivo.
  • High BIGH3 expression was observed in a majority of human RCC bone metastasis samples.

Conclusions:

  • Suppression of osteoblast differentiation by BIGH3 is a significant mechanism contributing to osteolytic lesions in RCC bone metastasis.
  • BIGH3 represents a potential therapeutic target for managing RCC-induced bone destruction.
  • Therapeutic strategies aimed at promoting bone formation may offer improved outcomes for patients with RCC bone metastasis.

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