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Toll-like receptor 4-mediated growth of endometriosis by human heat-shock protein 70

Khaleque Newaz Khan1, Michio Kitajima, Takehito Imamura

  • 1Department of Obstetrics and Gynecology, Graduate School of Biomedical Sciences, Nagasaki University, 1-7-1 Sakamoto, Nagasaki 852-8501, Japan. nemokhan@nagasaki-u.ac.jp

Human Reproduction (Oxford, England)
|July 4, 2008
PubMed
Abstract

Insights

Human heat-shock protein 70 (Hsp70) promotes pelvic inflammation and endometriosis growth by activating Toll-like receptor 4 (TLR4). This stress protein is elevated in endometriosis lesions, suggesting a key role in disease progression.

Area of Science:

  • Immunology
  • Cell Biology
  • Gynecology

Background:

  • Endometriosis is a condition characterized by endometrial tissue growth outside the uterus.
  • Toll-like receptor 4 (TLR4) is implicated in inflammatory processes.
  • Human heat-shock protein 70 (Hsp70) is a stress protein with potential roles in cellular responses.

Purpose of the Study:

  • To investigate the role of human heat-shock protein 70 (Hsp70) in Toll-like receptor 4 (TLR4)-mediated growth of endometriosis.
  • To examine the effects of Hsp70 on macrophage activation and endometrial stromal cell proliferation.

Main Methods:

  • TLR4 expression was analyzed in macrophages from women with and without endometriosis.
  • Macrophage production of cytokines was measured using ELISA after Hsp70 or anti-TLR4 antibody treatment.
  • Endometrial stromal cell growth was assessed via BrdU incorporation following Hsp70 and lipopolysaccharide (LPS) exposure.

Main Results:

  • Hsp70 significantly stimulated cytokine production (HGF, VEGF, IL-6, TNF-α) in macrophages from endometriosis patients, an effect blocked by anti-TLR4 antibody.
  • Hsp70 markedly enhanced endometrial stromal cell proliferation (approx. 50% increase), with a synergistic effect observed with LPS, both suppressed by anti-TLR4 antibody.
  • Elevated Hsp70 levels were found in eutopic endometria and peritoneal lesions of women with endometriosis compared to controls.

Conclusions:

  • Human Hsp70 induces pelvic inflammation and contributes to TLR4-mediated growth of endometrial cells in endometriosis.
  • A significant stress response is evident in endometriosis-associated peritoneal lesions.
  • Hsp70 represents a potential therapeutic target for managing endometriosis.

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