2003
DOI: 10.1080/03008200390151963
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Proteolytic Mechanisms in the Ovulatory Folliculo-Luteal Transformation

Abstract: The connective tissue matrix of the wall of ovarian follicles is degraded and remodeled during ovulatory rupture and formation of the corpus luteum. Ovarian surface epithelial cells in close contact with the apical wall of preovulatory ovine follicles secrete a urokinase-type plasminogen activator in response to surge levels of gonadotropins. Urokinase activates latent collagenases and stimulates release of tumor necrosis factor alpha from thecal endothelium. Tumor necrosis factor alpha progressively induces m… Show more

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Cited by 38 publications
(34 citation statements)
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“…Follicle rupture may be the most sensitive event, because it requires many cooperating steps to occur. Remodeling of the extracellular matrices, the cell layers in the follicle wall, and the ovarian surface epithelium at the apex of the follicle is required for follicle rupture (31,41,53). Constriction of a layer of smooth-muscle cells in the follicular wall at the time of rupture is also likely important (20).…”
Section: Discussionmentioning
confidence: 99%
“…Follicle rupture may be the most sensitive event, because it requires many cooperating steps to occur. Remodeling of the extracellular matrices, the cell layers in the follicle wall, and the ovarian surface epithelium at the apex of the follicle is required for follicle rupture (31,41,53). Constriction of a layer of smooth-muscle cells in the follicular wall at the time of rupture is also likely important (20).…”
Section: Discussionmentioning
confidence: 99%
“…PLANH1, the primary inhibitor of plasminogen activator that has been implicated in tumor growth and cellular remodeling (Stefansson et al 2003) and annexin a2 (ANXA2), a plasminogen-plasminogen activator co-receptor with angiogenic properties (Kim & Hajjar 2002), were also found to be differentially expressed. The upregulation of both PLANH1 and ANXA2 is curious given their contrasting functions within the plasminogen-plasminogen activator system that has functional roles in both ovulation and angiogenesis (Murdoch & Gottsch 2003). Their coexistence may simply reflect the delicate enzymatic balance that exists during cellular remodeling.…”
Section: Genbankmentioning
confidence: 99%
“…Growth factors may act directly to control follicular growth or may act indirectly by modifying the sensitivity of follicular cells to FSH and LH (Lucy 2000, Richards et al 2002a,b, Webb et al 2003, Fortune et al 2004. The release of the LH surge near the onset of estrus redirects preovulatory development and causes the biochemical differentiation of the follicle (luteinization) and ovulation (Richards et al 2002, Murdoch & Gottsch 2003. There is a shift from estrogen to progesterone synthesis, thinning and folding of the follicle wall, and dispersion of the granulosa cell layer (Smith et al 1994, Murphy et al 2001.…”
Section: Introductionmentioning
confidence: 99%
“…The MMPs are a comprehensive family of at least 28 zinc-containing endopeptidases, which can be classified into collagenases, gelatinases, stromelysins, membrane type and other MMPs by their structure, substrate specificity and subcellular distribution (Nagase & Woessner 1999, Curry & Osteen 2003. The activity of MMPs in the extracellular milieu is regulated by their tissue inhibitors (TIMPs 1-4), which bind reversibly to MMPs in a 1:1 stoichiometry and inhibit their activity (Gomez et al 1997, Brew et al 2000, Murdoch & Gottsch 2003. The PA system consists of the ubiquitous zymogen plasminogen, which can be activated to the proteolytic enzyme plasmin by two distinct forms of PA (tissue-type PA (tPA) and urokinase-type PA (uPA)) (Tsafriri & Reich 1999, Ny et al 2002.…”
Section: Introductionmentioning
confidence: 99%