{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,18]],"date-time":"2026-09-18T10:17:18Z","timestamp":1789726638252,"version":"4.0.1"},"reference-count":64,"publisher":"The Endocrine Society","issue":"3","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[1998,3,1]]},"abstract":"<jats:p>Echistatin, an RGD-containing peptide, was shown to inhibit the acute calcemic response to exogenous PTH or PTH-related protein (PTH-rP) in thyroparathyroidectomized rats, suggesting that echistatin inhibits bone resorption. In this study: 1) we present histological evidence for echistatin inhibition of bone resorption in mice with secondary hyperparathyroidism, and show that 2) echistatin binds to osteoclasts in vivo, 3) increases osteoclast number, and 4) does not detectably alter osteoclast morphology. Infusion of echistatin (30\u03bc g\/kg\u00b7min) for 3 days prevented the 2.6-fold increase in tibial cancellous bone turnover and the 36% loss in bone volume, produced by a low calcium diet. At the light microscopy level, echistatin immunolocalized to osteoclasts and megakaryocytes. Echistatin treatment increased osteoclast-covered bone surface by about 50%. At the ultrastructural level, these osteoclasts appeared normal, and the fraction of cells containing ruffled borders and clear zones was similar to controls. Echistatin was found on the basolateral membrane and in intracellular vesicles of actively resorbing osteoclasts. Weak labeling was found in the ruffled border, and no immunoreactivity was detected at the clear zone\/bone surface interface. These findings provide histological evidence for echistatin binding to osteoclasts and for inhibition of bone resorption in vivo, through reduced osteoclast efficacy, without apparent changes in osteoclast morphology.<\/jats:p>","DOI":"10.1210\/endo.139.3.5828","type":"journal-article","created":{"date-parts":[[2014,1,8]],"date-time":"2014-01-08T16:09:28Z","timestamp":1389197368000},"page":"1401-1410","source":"Crossref","is-referenced-by-count":26,"title":["Histomorphometric Evidence for Echistatin Inhibition of Bone Resorption in Mice with Secondary Hyperparathyroidism"],"prefix":"10.1210","volume":"139","author":[{"given":"Patricia","family":"Masarachia","sequence":"first","affiliation":[{"name":"Department of Bone Biology and Osteoporosis Research, Merck Research Laboratories, West Point, Pennsylvania 19486"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michiko","family":"Yamamoto","sequence":"additional","affiliation":[{"name":"Department of Bone Biology and 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