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Leptin Receptor · Journal article
Regenerative Therapy · July 4, 2026
Raises a question worth testing. It does not answer one.
Using a novel Cxcl12-Cre knock-in mouse model, this mechanistic study demonstrates that the CXCL12-expressing CAR cell lineage accounts for over 60% of endosteal osteoblasts and the majority of bone marrow adipocytes in skeletally mature adult mice, but not during postnatal growth. The work identifies CAR cells as a candidate therapeutic target for bone disease but remains a preclinical finding without human validation or clinical endpoints.
Lineage-tracing study in transgenic mice with single-cell RNA sequencing. Transgenic mice bearing Cxcl12-Cre knock-in allele crossed with a reporter line; traced from perinatal period through skeletal maturity; bone marrow and endosteal bone compartments examined. Intervention: Cxcl12-Cre knock-in allele with permanent lineage tracing via reporter; intermittent parathyroid hormone administration in subset of animals. Compared with: Untreated or vehicle-treated transgenic mice; postnatal growth period versus skeletally mature adulthood. The University of Osaka Graduate School of Dentistry, Japan (institutional affiliation of all authors).
Cxcl12+ lineage accounted for over 60% of endosteal osteoblasts in both cortical and trabecular bones in skeletally mature adult mice Cxcl12+ lineage gave rise to the majority of bone marrow adipocytes Contribution of lineage to osteogenesis was negligible during postnatal growth but substantial in adulthood
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This preclinical work suggests CAR cells may be therapeutic targets for age-related bone disease, but does not yet inform clinical practice. Translation to human bone biology and therapeutic efficacy requires further investigation.
This is a mechanistic lineage-tracing study in genetically modified mice that identifies CAR cells as a source of endosteal osteoblasts and adipocytes, but lacks clinical outcome data, human validation, or therapeutic intervention testing needed to guide practice.
As stated by the source record.
Quoted from the source exactly as published.
This preclinical work suggests CAR cells may be therapeutic targets for age-related bone disease, but does not yet inform clinical practice. Translation to human bone biology and therapeutic efficacy requires further investigation.
Graded across the dimensions that decide whether you should act, each from what the source actually supports. There is no single score, and where a dimension was not assessed it says so.
Introduction. CXCL12-abundant reticular (CAR) cells, characterized by high expression of CXCL12, are perisinusoidal bone marrow stromal cells that establish the hematopoietic stem cell niche. Although CAR cells are postulated to become precursor cells of both osteoblasts and adipocytes, the spatiotemporal dynamics of CAR cells-particularly their contribution to osteoblasts-remain poorly understood. Here, we defined the contribution of the endogenous Cxcl12-expressing (Cxcl12+) lineage to the skeleton from development to adulthood.Methods. A novel Cxcl12-Cre knock-in mouse model was generated that allows permanent lineage tracing of CAR cells and their progeny.Results. Lineage tracing revealed that the Cxcl12+ lineage arose perinatally and was initially localized around sinusoids in the bone marrow. During aging, these cells expanded and progressively populated non-sinusoidal regions distal to the sinusoids. While the contribution of the lineage to osteogenesis was negligible during postnatal growth, the lineage accounted for over 60% of endosteal osteoblasts in both cortical and trabecular bones in skeletally mature adult mice. Additionally, the lineage gave rise to the majority of bone marrow adipocytes. This lineage did not contribute to periosteal osteoblasts or extra-bone adipocytes. Furthermore, intermittent administration of the anabolic agent parathyroid hormone significantly promoted osteoblast differentiation from this lineage. Single-cell RNA sequencing confirmed the presence of both osteogenic and adipogenic precursors within the traced population.Conclusions. The Cxcl12-expression-based lineage tracing approach revealed the CAR cell lineage as the key source of endosteal osteoblasts and adipocytes in adult bone marrow, suggesting their important role in skeletal homeostasis. This lineage may represent a promising therapeutic target for age-related bone diseases.
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