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• W2071306987 abstract "We have proposed that growth hormone (GH) and prolactin (PRL) interact to suppress apoptosis in the mammary gland. GH increases insulin-like growth factor-I (IGF-I) synthesis whereas PRL suppresses the production of insulin-like growth factor-binding protein-5 (IGFBP-5) in the epithelial cells, which would otherwise inhibit IGF-mediated cell survival. IGFBP-5 was present in milk from involuting glands at high concentrations (approximately 60 microg/ml) and had a high affinity (8.03 x 10(-10) M) for IGF-I, suggesting an inhibitory effect of IGFBP-5 in the mammary gland. IGFBP-5 was present in the micellar fraction of milk and binds specifically to alpha(s2)-casein. Since alpha(s2)-casein also binds plasminogen and tissue-type plasminogen activator (t-PA), resulting in the conversion of plasminogen to plasmin, and since IGFBP-5 binds to plasminogen activator inhibitor-1 (PAI-1), we investigated whether apoptosis and extracellular matrix (ECM) degradation might be coordinately controlled by GH and PRL possibly acting through IGFBP-5. Litters were removed from lactating rats to initiate involution. Plasminogen activation and t-PA activity were both increased dramatically after 48 h and GH and PRL suppressed this response. By contrast, 17beta-oestradiol, progesterone or corticosterone did not influence either process. An antiserum to IGF-I, which blocked systemic IGF-I effects, failed to inhibit the activation of plasminogen or the increase in t-PA, suggesting that paracrine effects of IGF-I may be more important. Teat-sealing, which led to the accumulation of milk without hormonal changes, also led to increases in plasminogen activation and t-PA activity, suggesting that locally produced factors (of which IGFBP-5 is one) are important in controlling ECM remodelling. We propose that GH and PRL inhibit apoptosis and ECM remodelling by a process that involves the control of IGF-I and PAI-1 availability by IGFBP-5, thus allowing these processes to be tightly coordinated." @default.
• W2071306987 created "2016-06-24" @default.
• W2071306987 creator A5005974685 @default.
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• W2071306987 date "2000-11-01" @default.
• W2071306987 modified "2023-09-23" @default.
• W2071306987 title "Hormonal control of plasmin and tissue-type plasminogen activator activity in rat milk during involution of the mammary gland" @default.
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• W2071306987 doi "https://doi.org/10.1677/joe.0.1670265" @default.
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