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Adipocytes Enhance the Proliferation of Human Leiomyoma Cells Via TNF-α Proinflammatory Cytokine

Abstract

Objective

Obesity is a well-documented risk factor for uterine leiomyoma with a major impact on women health and health care system of the nation. Obesity is associated with increased secretion of adipokines that significantly influence growth and proliferation of tumor stroma and malignant cells. Adipokines, such as tumor necrosis factor α (TNF-α), are produced in the adipose tissue with concomitant expression in other organs and tissues. Increased and sustained cytokine production is associated with alterations in cell growth and differentiation. We, therefore, explored the influence of human adipocytes (SW872 cells)–mediated biological humoral factors on human uterine leiomyoma (HuLM) cells.

Methods

We measured cell proliferation and expression of cell-proliferating proteins (proliferating cell nuclear antigen [PCNA], cyclin D1, and B-cell lymphoma 2 [BCL-2]) in human leiomyoma cells cocultured with SW872 cells. SW872-conditioned media was neutralized for TNF-α and proliferation of HuLM cells was observed along with antiapoptotic marker, BCL-2, using Western immunoblot. Results: We found that both SW872-conditioned media and coculture with SW872 cells increased HuLM cell proliferation significantly (P < .05). We determined that this effect was associated with the upregulation of specific markers for proliferation, such as PCNA, cyclin D1, and BCL-2 (P < .05). Furthermore, the addition of neutralizing antibodies, anti-TNF-α, to SW872-conditioned media reversed the proliferation of leiomyoma cells and induced apoptosis as indicated by the reduced expression of antiapoptotic marker BCL-2. Conclusions: SW872 cells secrete TNF-α, which is associated with a proliferative gene profile in HuLM cells and may play a role in initiation and/or progression of uterine leiomyoma.

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Correspondence to Ayman Al-Hendy MD, PhD.

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Nair, S., Al-Hendy, A. Adipocytes Enhance the Proliferation of Human Leiomyoma Cells Via TNF-α Proinflammatory Cytokine. Reprod. Sci. 18, 1186–1192 (2011) doi:10.1177/1933719111408111

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Keywords

  • obesity
  • uterine leiomyoma
  • coculture
  • adipokines