bioRxiv Science⌕ Search
Home/Archive/bioRxiv

bioRxiv · 10.64898/2026.07.23.740406

Sex Differences in Physiological Hair Cycling and Adhesive Material-Induced Hair Regeneration in Mice

Chou, Y. Y.·Inoue, M.·Toge, T.·Yoshimura, A.·Takeuchi, S. Y.·Takahashi, O.·Haraguchi, K.·Kawasaki, K.·Kaminuma, O.·Matsubara, T.·Habu, M.·Kokabu, S.
View original source ↗Export metadata ↓

Abstract

Sex differences in hair growth are clinically evident, but sex-dependent regulation of physiological hair cycling and injury-induced hair regeneration remains incompletely understood. We compared physiological dorsal hair-cycle progression and adhesive material-induced localized hair regeneration in male and female C3H/He mice. Males entered the second and third anagen phases earlier than females, indicating longer telogen phases in females. In contrast, localized hair regrowth after application and removal of a cyanoacrylate adhesive material appeared earlier in females. Ovariectomy induced widespread telogen-to-anagen transition and therefore did not permit isolation of ovarian-hormone effects on the localized response. RNA sequencing of intact dorsal skin identified sex-dependent baseline expression profiles involving inflammation, wound response, and tissue repair. Independent time-course quantitative PCR further demonstrated sex-dependent expression of inflammatory and reparative genes after adhesive material application. Local clodronate liposome administration alone induced delayed perifocal hair growth. When combined with adhesive material application, clodronate treatment markedly delayed wound healing and localized hair regrowth in males, whereas these responses were comparatively preserved in females. These findings show that physiological hair cycling and adhesive material-induced hair regeneration exhibit distinct sex differences and suggest that the localized regenerative response is more macrophage-dependent in males than in females.

Explore related subjects

developmental biologyPreprint

Keep this discovery

Explore connections, maps & timelines

BibTeXRIS

Chou, Y. Y., Inoue, M., Toge, T., Yoshimura, A., Takeuchi, S. Y., Takahashi, O., Haraguchi, K., Kawasaki, K., Kaminuma, O., Matsubara, T., Habu, M., Kokabu, S.. 2026-07-24. Sex Differences in Physiological Hair Cycling and Adhesive Material-Induced Hair Regeneration in Mice. https://doi.org/10.64898/2026.07.23.740406

Cite the original work for its findings. Save a collection to share your selection of sources.

KEEP EXPLORING

Related preprints

bioRxiv2026

Neural regulation of hatching in amphibians

Many animal embryos hatch in response to threats or opportunities, yet how cue sensing activates hatching is unknown. We screened red-eyed treefrog (Agalychnis callidryas) eggs in the field with small molecules to discover that the neurotransmitter acetylcholine is a key mediator of hatching enzyme release. Using behavioral pharmacology, microscopy, and transcriptional profiling we identify direct cholinergic input on hatching gland cells that triggers enzyme release for egg rupture, and serotonergic transduction of embryonic hypoxia sensing. Independent hypoxia-sensing and mechanosensory predation-detection pathways converge on a hatching decision that elicits acetylcholine-dependent enzyme release and coordinated hatching-specific behavior. Cholinergic regulation of hatching enzyme release is conserved in a distantly related frog and salamander, suggesting a shared ancestral hatching mechanism. These results provide a neural basis for hatching plasticity which may have contributed to the evolution of diverse hatching modes in amphibians.

developmental biology↗
bioRxiv2026

Towards Understanding the Microenvironmental Control of Reindeer Antler Regeneration

Deer antlers are the only mammalian appendages capable of complete periodic regeneration and therefore provide a natural model for investigating mechanisms of skeletal regeneration. However, current knowledge of the structural and molecular characteristics of the regenerative antler microenvironment remains incomplete. Here, we compared antler tip and antler base tissues from Rangifer tarandus (reindeer) with mature metacarpal cortical bone using structural, compositional, histological, and proteomic analyses. Antler tissues exhibited smaller and less crystalline apatite structures, elevated carbonate substitution, and higher organic matrix content compared with metacarpal bone, indicating an immature mineral phase. Antlers also exhibited lower bone mineral density, greater porosity, reduced bone volume fraction, and greater trabecular separation, particularly in central regions, consistent with a dynamic remodeling microenvironment. Histological examination revealed abundant active osteons and extensive osteoid seams in antler tissues, whereas metacarpal bone predominantly comprised mature lamellar bone with limited remodeling activity. Proteomic profiling identified distinct extracellular matrix signatures between antler and metacarpal tissues. Metacarpal bone was enriched in proteins associated with skeletal homeostasis, mechanotransduction, and bone remodeling, whereas antler tissues were enriched in proteins involved in extracellular matrix reorganization, metabolic adaptation, and regeneration. Collectively, these findings indicate that reindeer antlers possess a specialized regenerative skeletal microenvironment characterized by immature mineral organization, active remodeling, and distinct molecular signatures associated with rapid tissue growth. These results provide new insights into the biological basis of mammalian appendage regeneration and may facilitate the development of regenerative strategies for bone repair and skeletal tissue engineering.

developmental biology↗
bioRxiv2026

Endogenous expression of mutant RagC in mice results in early-onset dilated cardiomyopathy with features of the Long-Olsen-Distelmaier syndrome

Dilated cardiomyopathy (DCM) is a severe heart condition often linked to arrhythmias, clots, and heart failure, for which treatments are not yet curative. Recently, de novo mutations in genes encoding components of the Rag GTPase nutrient signaling pathway, particularly in RRAGC, have been found in unrelated patients with a severe, early-onset DCM syndrome called Long-Olsen-Distelmaier. Cancer cell lines, hiPSC-derived cardiomyocytes and zebrafish have been used to study this Ragopathy, but a mammalian model to investigate this syndrome has not been generated. Here, we show that mice engineered to endogenously express mutations in Serine 74 (orthologous to the Serine 75 mutated in patients), exhibit early-onset features of DCM with decreased heart size, fibrosis, diastolic dysfunction and aortic insufficiency, characteristics reminiscent of the human syndrome. Moreover, Rragc-mutant hearts display decreased left ventricular mass and interventricular septum. Endogenous heterozygous expression of Rragc mutant variants result in a milder, sublethal defective physiological cardiac growth with increased systolic and diastolic blood pressure. Mechanistically, active RagC does not cause abnormal increase in cardiomyocyte size, but leads to suppressed transcriptional activity of Tfeb and alterations in cardiomyocyte metabolism. Transcriptional profiling of neonatal mutant hearts reveals multiple signatures of impaired mitochondrial activity. Ex vivo and in vitro analyses of murine cardiomyocyte mitochondria from Rragc-mutant mice show suppressed mitochondrial respiration, disturbed complex IV multimerization and super-complex organization. These data point to abnormal early postnatal heart metabolism by deregulated nutrient - Rag GTPase signaling with a potential molecular explanation to the early onset of DCM in patients with de novo missense mutations in RRAGC, and suggests the relevance of early metabolic interventions in conditions with altered nutrient signaling

developmental biology↗