Endothelin-2 in Ovarian Follicle Rupture

卵巢卵泡破裂中的内皮素 2

• 批准号: 7393644
• 负责人: CHEMYONG JAY KO
• 金额: $ 23.14万
• 依托单位: UNIVERSITY OF KENTUCKY
• 依托单位国家: 美国
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-05-15 至 2011-02-28
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/7393644
• 关键词: Animal Model; BQ123; Binding Sites; Biochemical; Biochemical Process; Clinical; Constriction procedure; Count; Cyst; Databases; Development; Disease; Endothelin; Endothelin Receptor; Endothelin Receptor Antagonist; Endothelin-2; Estrogen Receptor alpha; Estrogens; Experimental Models; Failure; Female infertility; Gene Expression; Gene Expression Profiling; Genes; Genome; Goals; Growth; Hormonal; Immunohistochemistry; In Situ Hybridization; Individual; Indomethacin; Infertility; Injection of therapeutic agent; Isometric Exercise; Knockout Mice; Knowledge; Label; Lead; Link; Luteinizing Hormone; Mammalian Oviducts; Measurement; Measures; Mediating; Molecular; Molecular Profiling; Mus; Numbers; Oocytes; Ovarian; Ovarian Diseases; Ovarian Follicle; Ovarian Tissue; Ovary; Ovulation; PTGS2 gene; Pattern; Pituitary Gonadotropins; Porifera; Process; Progesterone; Progesterone Receptors; Prostaglandin Receptor; Prostaglandins; RU-486; Radioimmunoassay; Rattus; Research Personnel; Residual state; Reverse Transcriptase Polymerase Chain Reaction; Role; Rupture; Smooth Muscle; Structure; Symptoms; Syndrome; System; Techniques; Theca Externa; Therapeutic; Tissues; Vasoactive Intestinal Peptide; corpus luteum; granulosa cell; in vivo; inhibitor/antagonist; intraovarian; novel; programs; receptor; research study; tezosentan; therapeutic target

The goal of the proposed studies is to elucidate the mechanism of endothelin-2 (EDN-2) action in follicle rupture. The program of ovulation is activated by a surge of luteinizing hormone, which initiates dramatic changes in molecular, biochemical, and physical aspects of the ovary, eventually leading to rupture of follicles. However, the factors involved in and the mechanism governing the process of follicle rupture are yet to be unveiled. Using a gene expression profiling approach, we have identified EDN-2, a potent smooth muscle constrictor, which is exclusively and transiently expressed in the granulosa cells of periovulatory follicles immediately prior to ovulation. We found that EDN-2 induces rapid and sustained contraction in the ovarian tissue, while tezosentan, an endothelin receptor antagonist, released the contraction. These novel findings led us to hypothesize that EDN-2 directly constricts periovulatory follicles leading to the rupture of the follicle. Supporting the hypothesis, immunohistochemical analysis identified a well-organized smooth muscle layer in the theca externa of each follicle, which forms a sponge-like smooth muscle network at the whole ovarian level. Furthermore, we found that intraovarian injection of tezosentan prior to ovulation completely blocked follicle rupture. In this study, we will elucidate the mechanism of EDN-2 action in follicle rupture. We will determine the target tissues of EDN-2 action, the endothelin receptor subtype(s) that mediates EDN-2 action, and the ovarian concentration of EDN-2. We will also determine the mechanism of endothelin-2 induced follicular constriction in relation to other ovary-produced vasoconstrice molecules (VIPs, PACAPs, and prostaglandins). In addition, the functional link of progesterone, estrogen, and prostaglandin to the follicle rupture in relation to EDN-2 will be explored. The major strength of this proposal is in the identification of EDN-2 and the ovarian smooth muscle network as the key components of follicle rupture. The novelty of the proposed experiments is the interdisplinary approachs (genome-wide gene expression profiling, intraovarian injection, and isometric tension measurement). The proposed studies are exceptionally important in order to further our understanding of the mechanism of follicle rupture. The proposed experiments will provide clinical direction in identifying the therapeutic target for the cure of annovulatory symptoms, one of the leading causes of female infertility.

本研究的目的是阐明内皮素-2 （EDN-2）在卵泡中的作用机制