CXCL8 enhances proliferation and growth and reduces apoptosis in endometrial stromal cells in an autocrine manner via a CXCR1-triggered PTEN/AKT signal pathway

Ming-Qing Li, Ming‐Qing Li, Xuezhen Luo, Xue-Zhen Luo, Yu-Han Meng, Y. H. Meng, Jie Mei, Xiaoli Zhu, Xiao-Yong Zhu, Li-Ping Jin, L.-P. Jin, D.-J. Li, Da-Jin Li
Human Reproduction · 2012 · vol. 27(7) , pp. 2107–2116 · doi:10.1093/humrep/des132 · PMID:22563025 · W2099330373
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CXCL8 enhances endometrial stromal cell proliferation and growth while reducing apoptosis in an autocrine manner via a CXCR1-triggered PTEN/AKT pathway.

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Abstract

BACKGROUND: Chemokine CXCL8 (also known as IL-8) has been identified as a potential regulator of endometrial stromal cells (ESCs), but it is unclear how CXCL8 regulates the survival of ESCs in the pathogenesis of endometriosis. METHODS: We assessed the secretion of CXCL8 by enzyme-linked immunosorbent assays and the expression of its receptors, CXCR1 and CXCR2, by in-cell Western assay and immunohistochemistry. The effects of CXCL8 on the activation or expression of various cell mediators were also investigated by in-cell Western assay. The effects of CXCL8 on the proliferation, growth and apoptosis of ESCs in vitro were assessed by BrdU assays, cell counts and annexin V labeling, respectively. RESULTS: Secretion of CXCL8 and expression of CXCR1 in the eutopic ESCs from women with endometriosis were significantly higher than that in control ESCs, but the expression of CXCR2 showed no significant difference between these two cell types. CXCL8 stimulated proliferation and growth and reduced apoptosis of ESCs in an autocrine manner, and these effects were abolished by anti-human CXCL8 and CXCR1 neutralizing antibodies and by a PI3K/Akt inhibitor. Moreover, CXCL8 up-regulated the expression of the anti-apoptotic proteins, survivin and Bcl-2, inhibited the expression of the Phosphatase and tensin homolog (PTEN) and activated the phosphorylation of Akt. CONCLUSIONS: This study suggests that CXCL8 and CXCR1 are involved in the pathogenesis of endometriosis by up-regulating proliferation and growth and restricting apoptosis in ESCs by activating the PTEN/Akt pathway and mediating the expression of survivin and Bcl-2.

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Condition tags

mesh:D004715endometriosis

MeSH descriptors

Endometrium Interleukin-8 Receptors, Interleukin-8A Adult Apoptosis Bromodeoxyuridine Bromodeoxyuridine Cell Enlargement Cell Proliferation Endometriosis Endometriosis Endometrium Enzyme-Linked Immunosorbent Assay Enzyme-Linked Immunosorbent Assay Female Humans Immunohistochemistry Immunohistochemistry Inhibitor of Apoptosis Proteins Inhibitor of Apoptosis Proteins

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