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Using approaches of molecular mouse genetics and spatial transcriptomics applied to formalin-fixed, paraffin-embedded tissues, we show that ADGRG6\/GPR126, a cartilage-enriched adhesion G protein-coupled receptor (GPCR), is essential for maintaining slow-cycling resting zone cells, appropriate chondrocyte proliferation and differentiation, and growth plate homeostasis in mice. Constitutive ablation of Adgrg6 in osteochondral progenitor cells with Col2a1Cre leads to a shortened resting zone, formation of cell clusters within the proliferative zone, and an elongated hypertrophic growth plate, marked by limited expression of parathyroid hormone-related protein (PTHrP) but increased Indian Hedgehog (IHH) signaling throughout the growth plate. Attenuation of smoothened-dependent hedgehog signaling restored the Adgrg6 deficiency-induced expansion of hypertrophic chondrocytes, confirming that IHH signaling can promote chondrocyte hypertrophy in a PTHrP-independent manner. In contrast, postnatal ablation of Adgrg6 in mature chondrocytes with AcanCreERT2, induced after the formation of the resting zone, does not affect PTHrP expression but causes an overall reduction of growth plate thickness marked by increased cell death specifically in the resting zone cells and a general reduction of chondrocyte proliferation and differentiation. Spatial transcriptomics reveals that ADGRG6 is essential for maintaining chondrocyte homeostasis by regulating osteogenic and catabolic genes in all the zones of the postnatal growth plates, potentially through positive regulation of SOX9 expression. Our findings elucidate the essential role of a cartilage-enriched adhesion GPCR in regulating cell proliferation and hypertrophic differentiation by regulation of PTHrP\/IHH signaling, maintenance of slow-cycle resting zone chondrocytes, and safeguarding chondrocyte homeostasis in postnatal mouse growth plates.<\/jats:p>","DOI":"10.1093\/jbmr\/zjae144","type":"journal-article","created":{"date-parts":[[2024,9,5]],"date-time":"2024-09-05T19:48:19Z","timestamp":1725565699000},"page":"1644-1658","source":"Crossref","is-referenced-by-count":19,"title":["The G protein-coupled receptor ADGRG6 maintains mouse growth plate homeostasis through IHH signaling"],"prefix":"10.1093","volume":"39","author":[{"given":"Fangzhou","family":"Bian","sequence":"first","affiliation":[{"name":"Center for Craniofacial Molecular Biology , Herman Ostrow School of Dentistry, , Los Angeles, CA 90033,","place":["United States"]},{"name":"University of Southern California , Herman Ostrow School of Dentistry, , Los 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Pediatric Research Institute, , Austin, TX 78723,","place":["United States"]},{"name":"The University of Texas at Austin , Dell Pediatric Research Institute, , Austin, TX 78723,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yang","family":"Chai","sequence":"additional","affiliation":[{"name":"Center for Craniofacial Molecular Biology , Herman Ostrow School of Dentistry, , Los Angeles, CA 90033,","place":["United States"]},{"name":"University of Southern California , Herman Ostrow School of Dentistry, , Los Angeles, CA 90033,","place":["United States"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chia-Lung","family":"Wu","sequence":"additional","affiliation":[{"name":"Center for Musculoskeletal Research , Department of Orthopedics and Rehabilitation, , Rochester, NY 14642,","place":["United States"]},{"name":"University of Rochester Medical Center , Department of Orthopedics and Rehabilitation, , Rochester, NY 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