Galectin-9 regulates HTR8/SVneo function via JNK signaling

in Reproduction
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  • 1 Department of Obstetrics and Gynecology, Guangzhou First People’s Hospital, School of Medicine, South China University of Technology, Guangzhou, China
  • 2 Laboratory for Reproductive Immunology, NHC Key Lab of Reproduction Regulation (Shanghai Institute of Planned Parenthood Research), Shanghai Key Laboratory of Female Reproductive Endocrine Related Diseases, Hospital of Obstetrics and Gynecology, Fudan University Shanghai Medical College, Shanghai, China
  • 3 Department of Gynecology, Jing’an District Central Hospital, Fudan University, Shanghai, China

Correspondence should be addressed to S Wang or J Zhang or M Du; Email: songcunwang@163.com or g5615335@126.com or dmrlq1973@sina.cn
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To obtain a successful pregnancy, trophoblasts must provide a physical barrier, suppress maternal reactivity, produce immunosuppressive hormones locally, and enhance the production of blocking factors that are able to bind to several antigenic sites. Inadequate placental perfusion has been closely associated with several pregnancy-associated diseases. Galectin-9 (Gal-9) has a wide variety of regulatory functions in innate and adaptive immunity during infection, tumor growth, and organ transplantation. We utilized immortalized human first-trimester extravillous trophoblast cells (HTR8/SVneo) for our functional study and examined the effects of Gal-9 on apoptosis, cytokine production and angiogenesis of HTR8/SVneo cells. Gal-9 inhibited the apoptosis and IFN-γ and IL-17A production, promoted IL-4 production, and coordinated the crosstalk between HTR8/SVneo cells and human umbilical vein endothelial cells via its interaction with Tim-3. Blockade of JNK signaling inhibited Gal-9 activities in HTR8/SVneo cells. In addition, we detected a correlation between low levels of Gal-9 and spontaneous abortion. So Gal-9 could inhibit the apoptosis and proinflammatory cytokine expression, and promote the angiogenesis and IL-4 production in HTR8/SVneo cells via Tim-3 in a JNK dependent manner to help the maintenance of normal pregnancy. These findings possibly identify Gal-9 as a key regulator of trophoblast cells and suggest its potential as a biomarker and target for the treatment of recurrent pregnancy loss.

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