{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,27]],"date-time":"2026-09-27T13:42:43Z","timestamp":1790516563509,"version":"4.1.0"},"reference-count":35,"publisher":"National Academy of Sciences","issue":"25","content-domain":{"domain":["www.pnas.org"],"crossmark-restriction":true},"short-container-title":["Proc. Natl. Acad. Sci. U.S.A."],"published-print":{"date-parts":[[1997,12,9]]},"abstract":"<jats:p>\n                    Mice in which the genes encoding the parathyroid hormone (PTH)-related peptide (PTHrP) or the PTH\/PTHrP receptor have been ablated by homologous recombination show skeletal dysplasia due to accelerated endochondral bone formation, and die at birth or\n                    <jats:italic>in utero<\/jats:italic>\n                    , respectively. Skeletal abnormalities due to decelerated chondrocyte maturation are observed in transgenic mice where PTHrP expression is targeted to the growth plate, and in patients with Jansen metaphyseal chondrodysplasia, a rare genetic disorder caused by constitutively active PTH\/PTHrP receptors. These and other findings thus indicate that PTHrP and its receptor are essential for chondrocyte differentiation. To further explore the role of the PTH\/PTHrP receptor in this process, we generated transgenic mice in which expression of a constitutively active receptor, HKrk-H223R, was targeted to the growth plate by the rat \u03b11 (II) collagen promoter. Two major goals were pursued: (\n                    <jats:italic>i<\/jats:italic>\n                    ) to investigate how constitutively active PTH\/PTHrP receptors affect the program of chondrocyte maturation; and (\n                    <jats:italic>ii<\/jats:italic>\n                    ) to determine whether expression of the mutant receptor would correct the severe growth plate abnormalities of PTHrP-ablated mice (PTHrP\u2212\/\u2212). The targeted expression of constitutively active PTH\/PTHrP receptors led to delayed mineralization, decelerated conversion of proliferative chondrocytes into hypertrophic cells in skeletal segments that are formed by the endochondral process, and prolonged presence of hypertrophic chondrocytes with delay of vascular invasion. Furthermore, it corrected at birth the growth plate abnormalities of PTHrP\u2212\/\u2212 mice and allowed their prolonged survival. \u201cRescued\u201d animals lacked tooth eruption and showed premature epiphyseal closure, indicating that both processes involve PTHrP. These findings suggest that rescued PTHrP\u2212\/\u2212 mice may gain considerable importance for studying the diverse, possibly tissue-specific role(s) of PTHrP in postnatal development.\n                  <\/jats:p>","DOI":"10.1073\/pnas.94.25.13689","type":"journal-article","created":{"date-parts":[[2002,7,26]],"date-time":"2002-07-26T10:42:40Z","timestamp":1027680160000},"page":"13689-13694","update-policy":"https:\/\/doi.org\/10.1073\/pnas.cm10313","source":"Crossref","is-referenced-by-count":305,"title":["Targeted expression of constitutively active receptors for parathyroid hormone and parathyroid hormone-related  peptide delays endochondral bone formation and rescues  mice that lack parathyroid hormone-related\u2009peptide"],"prefix":"10.1073","volume":"94","author":[{"given":"E.","family":"Schipani","sequence":"first","affiliation":[{"name":"Endocrine Unit, Department of Medicine and Children\u2019s Service, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02114; and Institute of Pathology, Forschungszentrum f\u00fcr Umwelt und Gesundheit GmbH, M\u00fcnchen, D85758 Neuherberg, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"B.","family":"Lanske","sequence":"additional","affiliation":[{"name":"Endocrine Unit, Department of Medicine and Children\u2019s Service, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02114; and Institute of Pathology, Forschungszentrum f\u00fcr Umwelt und Gesundheit GmbH, M\u00fcnchen, D85758 Neuherberg, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J.","family":"Hunzelman","sequence":"additional","affiliation":[{"name":"Endocrine Unit, Department of Medicine and Children\u2019s Service, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02114; and Institute of Pathology, Forschungszentrum f\u00fcr Umwelt und Gesundheit GmbH, M\u00fcnchen, D85758 Neuherberg, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A.","family":"Luz","sequence":"additional","affiliation":[{"name":"Endocrine Unit, Department of Medicine and Children\u2019s Service, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02114; and Institute of Pathology, Forschungszentrum f\u00fcr Umwelt und Gesundheit GmbH, M\u00fcnchen, D85758 Neuherberg, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"C. S.","family":"Kovacs","sequence":"additional","affiliation":[{"name":"Endocrine Unit, Department of Medicine and Children\u2019s Service, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02114; and Institute of Pathology, Forschungszentrum f\u00fcr Umwelt und Gesundheit GmbH, M\u00fcnchen, D85758 Neuherberg, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"K.","family":"Lee","sequence":"additional","affiliation":[{"name":"Endocrine Unit, Department of Medicine and Children\u2019s Service, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02114; and Institute of Pathology, Forschungszentrum f\u00fcr Umwelt und Gesundheit GmbH, M\u00fcnchen, D85758 Neuherberg, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"A.","family":"Pirro","sequence":"additional","affiliation":[{"name":"Endocrine Unit, Department of Medicine and Children\u2019s Service, Massachusetts General Hospital and Harvard Medical School, Boston, MA 02114; and Institute of Pathology, Forschungszentrum f\u00fcr Umwelt und Gesundheit GmbH, M\u00fcnchen, D85758 Neuherberg, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"H. 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