Hematopoietic Stem Cell-derived Adipocytes Promote Tumor Growth and Cancer Cell Migration

Overview

Journal Int J Cancer Res Mol Mech

Date 2017 Oct 10

PMID 28989976

Citations 10

Authors

Y Xiong

D L Russell

L T McDonald

L A Cowart

A C LaRue

Affiliations

Soon will be listed here.

Abstract

Adipocytes, apart from their critical role as the energy storage depots, contribute to the composition of the tumor microenvironment. Our previous studies based on a single hematopoietic stem cell (HSC) transplantation model, have revealed a novel source of adipocytes from HSCs monocyte/macrophage progenitors. Herein, we extend these studies to examine the role of HSC-derived adipocytes (HSC-Ad) in tumor progression. When cultured under adipogenic conditions, bone marrow-derived monocytic progenitors differentiated into adipocytes that accumulated oil droplets containing triglyceride. The adipokine array and ELISAs confirmed secretion of multiple adipokines by HSC-Ad. These adipocytes underwent further development when injected subcutaneously into C57Bl/6 mice. When co-injected with melanoma B16F1 cells or breast cancer E0771 cells into syngeneic C57Bl/6 mice, HSC-Ad not only accelerated both melanoma and breast tumor growth, but also enhanced vascularization in both tumors. Conditioned media from HSC-Ad supported B16F1 and E0771 cell proliferation and enhanced cell migration . Among the HSC-Ad secreted adipokines, insulin-like growth factor 1 (IGF-1) played an important role in E0771 cell proliferation. Hepatocyte growth factor (HGF) was indispensable for B16F1 cell migration, whereas HGF and platelet-derived growth factor BB (PDGF-BB) collectively contributed to E0771 cell migration. Expression levels of receptors for IGF-1, HGF, and PDGF-BB correlated with their differential roles in B16F1 and E0771 cell proliferation and migration. Our data suggest that HSC-Ad differentially regulate tumor behavior through distinct mechanisms.

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