Immunohistochemical localization, identification and regulation of the interleukin-1 receptor antagonist in the human endometrium.
There is evidence suggesting the importance of the interleukin-1 receptor type I (IL-1Rtl) and interleukin-1 beta (IL-1 beta) as mediator in local intercellular interactions in endometrial tissue and embryonic implantation. To complete our understanding of the entire endometrial IL-1 system in humans, we have investigated the immunohistochemical distribution of IL-1 receptor antagonist (IL-1ra) in the human endometrium throughout the menstrual cycle. We have also identified the forms of IL-1ra present in human endometrial cells. Immunoreactive IL-1ra was found in both cryostat and paraffin-embedded sections of human endometrium using the alkaline phosphatase-peroxidase (A-P) method with two different IL-1ra antibodies. IL-1ra was present throughout the entire menstrual cycle, located primarily in the endometrial epithelium. However, IL-1ra staining was significantly higher during follicular phase in comparison with early and mid-late luteal phases. Reverse transcriptase polymerase chain reaction of cultured stromal and glandular cells showed that these cells express the intracellular form of IL-1ra mRNA (icIL-1ra). Our results demonstrate the regulated presence of the icIL-1ra in the human endometrium. This finding supports a possible autocrine-paracrine role for the IL-1 system in the human endometrium and embryonic implantation.
Simón
C
C
Instituto Valenciano de Infertilidad, Valencia University, Spain.
Frances
A
A
Lee
B Y
BY
Mercader
A
A
Huynh
T
T
Remohi
J
J
Polan
M L
ML
Pellicer
A
A
D000328:Adult; D001483:Base Sequence; D004717:Endometrium / Q000737:chemistry*; D004848:Epithelium / Q000737:chemistry; D005260:Female; D005498:Follicular Phase; D006801:Humans; D007124:Immunoenzyme Techniques; D053590:Interleukin 1 Receptor Antagonist Protein; D008183:Luteal Phase; D008597:Menstrual Cycle; D008969:Molecular Sequence Data; D012333:RNA, Messenger / Q000378:metabolism; D017472:Receptors, Interleukin-1 / Q000037:antagonists & inhibitors*; D012795:Sialoglycoproteins / Q000032:analysis* / Q000235:genetics; D017154:Stromal Cells / Q000737:chemistry
C507763:IL1RN protein, human; D053590:Interleukin 1 Receptor Antagonist Protein; D012333:RNA, Messenger; D017472:Receptors, Interleukin-1; D012795:Sialoglycoproteins