{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,7]],"date-time":"2026-10-07T06:12:22Z","timestamp":1791353542471,"version":"4.3.1"},"reference-count":111,"publisher":"The Endocrine Society","issue":"4","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2015,4,1]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Defects in the Lhx4, Lhx3, and Pitx2 genes can cause combined pituitary hormone deficiency and pituitary hypoplasia in both humans and mice. Not much is known about the mechanism underlying hypoplasia in these mutants beyond generally increased cell death and poorly maintained proliferation. We identified both common and unique abnormalities in developmental regulation of key cell cycle regulator gene expression in each of these three mutants. All three mutants exhibit reduced expression of the proliferative marker Ki67 and the transitional marker p57. We discovered that expression of the cyclin-dependent kinase inhibitor 1a (Cdkn1a or p21) is expanded dorsally in the pituitary primordium of both Lhx3 and Lhx4 mutants. Uniquely, Lhx4 mutants exhibit reduced cyclin D1 expression and have auxiliary pouch-like structures. We show evidence for indirect and direct effects of LHX4 on p21 expression in \u03b1T3-1 pituitary cells. In summary, Lhx4 is necessary for efficient pituitary progenitor cell proliferation and restriction of p21 expression.<\/jats:p>","DOI":"10.1210\/me.2014-1380","type":"journal-article","created":{"date-parts":[[2015,2,10]],"date-time":"2015-02-10T17:39:37Z","timestamp":1423589977000},"page":"597-612","source":"Crossref","is-referenced-by-count":12,"title":["Lhx4 Deficiency: Increased Cyclin-Dependent Kinase Inhibitor Expression and Pituitary Hypoplasia"],"prefix":"10.1210","volume":"29","author":[{"given":"Peter","family":"Gergics","sequence":"first","affiliation":[{"name":"Department of Human Genetics, University of Michigan, Ann Arbor, Michigan 48109"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michelle L.","family":"Brinkmeier","sequence":"additional","affiliation":[{"name":"Department of Human Genetics, University of Michigan, Ann Arbor, Michigan 48109"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sally 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