Estradiol regulates MICA expression in human endometrial cells.
The human endometrium undergoes cyclical changes regulated by sex hormones. Evidence suggests that sex hormones regulate NK cell recruitment into the uterus in large numbers. NKG2D is an activating receptor expressed on human NK cells, gammadelta and CD8 T cells. NKG2D ligands are known to be sensors of cellular "stress". In this study, we investigated whether sex hormones directly regulate expression of NKG2D ligands in the human uterus. Estradiol increased MICA expression on uterine epithelial cells; regulation was estrogen receptor-dependent. Real-time PCR analysis showed that NKG2D ligands MICA and MICB were expressed in the human endometrium. MICA protein was detected primarily on epithelial cells, and greater expression was observed in immunohistochemical analysis of tissues from patients in the secretory phase of the menstrual cycle. Thus, estrogens regulate expression of MICA. These data suggest hormonal regulation of innate immunity and NKG2D-mediated recognition in other tissues and diseases where estrogen may be involved.
Basu
Satarupa
S
Department of Microbiology and Immunology, Dartmouth Medical School, Lebanon, NH 03756, USA.
Pioli
Patricia A
PA
Conejo-Garcia
Jose
J
Wira
Charles R
CR
Sentman
Charles L
CL
D045744:Cell Line, Tumor; D004717:Endometrium / Q000276:immunology*; D004958:Estradiol / Q000494:pharmacology*; D005260:Female; D058851:GPI-Linked Proteins; D005786:Gene Expression Regulation / Q000187:drug effects*; D015395:Histocompatibility Antigens Class I / Q000032:analysis / Q000235:genetics* / Q000502:physiology; D006801:Humans; D036341:Intercellular Signaling Peptides and Proteins / Q000032:analysis; D012333:RNA, Messenger / Q000032:analysis
D058851:GPI-Linked Proteins; D015395:Histocompatibility Antigens Class I; D036341:Intercellular Signaling Peptides and Proteins; C099187:MHC class I-related chain A; D012333:RNA, Messenger; C423230:ULBP2 protein, human; D004958:Estradiol