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Adrenocorticotropic hormone (ACTH) has neuroprotective actions and is a candidate to ameliorate brain damage following PIVH. Here, we tested the efficacy of ACTH<jats:sub>1-24<\/jats:sub> on a collagenase-induced lesion of the germinal matrix (GM) in newborn male rats. Animals received microinjection of the vehicle (PBS, 2\u00a0\u00b5l) or collagenase type VII (0.3\u00a0IU) into the GM\/periventricular tissue on postnatal day (PN) 2. Twelve hours later pups received microinjection of either the agonist ACTH<jats:sub>1-24<\/jats:sub> (0.048\u00a0mg\/kg), or the antagonist SHU9119 (antagonist of MCR3\/MCR4 receptors, 0.01\u00a0mg\/kg), or their combination. Morphological outcomes included striatal injury extension, neuronal and glial cells counting, and immunohistochemical expression of brain lesion biomarkers ipsilateral and contralateral to the hemorrhagic site. Data were evaluated on PN 8. Collagenase induced PIVH and severe ipsilateral striatal lesion. ACTH<jats:sub>1-24<\/jats:sub> dampened the deleterious effects of collagenase-induced hemorrhage in significantly reducing the extension of the damaged area, the striatal neuronal and glial losses, and the immunoreactive expression of the GFAP, S100\u03b2, and NG2-glia biomarkers in the affected periventricular area. SHU9119 blocked the glial density rescuing effect of ACTH<jats:sub>1-24<\/jats:sub>. ACTH<jats:sub>1-24<\/jats:sub> could be further evaluated to determine its suitability for preclinical models of PVH in premature infants.<\/jats:p>","DOI":"10.1038\/s41598-020-74712-7","type":"journal-article","created":{"date-parts":[[2020,10,20]],"date-time":"2020-10-20T10:03:16Z","timestamp":1603188196000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Neuroprotective effect of ACTH on collagenase-induced peri-intraventricular hemorrhage in newborn male rats"],"prefix":"10.1038","volume":"10","author":[{"given":"Camila A.","family":"Martins","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Laura Tartari","family":"Neves","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Marina M. B. 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