Mills, T. W. | bioRxiv Science

bioRxiv2026

Cryptochrome Loss Drives COPD-like Lung Pathology through Disrupted Alveolar Epithelial Proliferation and Immune Homeostasis

Chronic obstructive pulmonary disease (COPD) is a progressive lung disease characterized by alveolar destruction, impaired epithelial regeneration and chronic inflammation. While circadian disruption has been linked to COPD pathogenesis, the cellular mechanisms remain unclear. Here, we identify the core clock components Cryptochrome 1 and 2 (Cry1/2) as essential regulators of alveolar epithelial cell proliferation and pulmonary immune homeostasis. Cry1/2 double knockout (dKO) mice exhibit spontaneous emphysema-like pathology, including airspace enlargement, increased lung compliance, and inflammatory cell infiltration without environmental insults. Mechanistically, Cry1/2-deficient alveolar epithelial cells display reduced proliferative capacity, and transcriptomic profiling revealed a pronounced shift toward a more proximal airway-like phenotype. Notably, these cells share a gene signature with human COPD lungs in pathways involving immune regulation. Furthermore, Cry1/2-deficient macrophages show elevated responsiveness to LPS. Bone marrow (BM) transplantation revealed that mice receiving Cry1/2 dKO BM suffer from enhanced lung inflammation without airspace enlargement, supporting a critical role of epithelial Cry1/2 in maintaining alveolar integrity. Importantly, treatment with Nobiletin, a circadian rhythm-modulating compound, mitigates NF-{kappa}B activation and ameliorates lung inflammation and structural damage in Cry1/2 dKO mice. These findings establish CRY1/2 as critical circadian regulators of epithelial cell proliferation and immune homeostasis, and highlight the therapeutic potential of targeting circadian pathways in COPD.

genetics↗

bioRxiv2024

Deletion of adipocyte Sine Oculis Homeobox Homolog 1 prevents lipolysis and attenuates skin fibrosis.

Dermal fibrosis is a cardinal feature of systemic sclerosis (SSc) for which there are limited treatment strategies. This is in part due to our fragmented understanding of how dermal white adipose tissue (DWAT) contributes to skin fibrosis. We identified elevated sine oculis homeobox homolog 1 (SIX1) expression in SSc skin samples from the GENISOS and PRESS cohorts, the expression of which correlated with adipose-associated genes and molecular pathways. SIX1 localization studies identified increased signals in the DWAT area in SSc and in experimental models of skin fibrosis. Global and adipocyte specific Six1 deletion abrogated end-stage fibrotic gene expression and dermal adipocyte shrinkage induced by SQ bleomycin treatment. Further studies revealed a link between elevated SIX1 and increased expression of SERPINE1 and its protein PAI-1 which are known pro-fibrotic mediators. However, SIX1 deletion did not appear to affect cellular trans differentiation. Taken together these results point at SIX1 as a potential target for dermal fibrosis in SSc. Research in contextO_ST_ABSEvidence before this studyC_ST_ABSSkin thickening and tightening are leading causes of morbidity in systemic sclerosis (SSc). The authors previously reported that the aberrantly expressed developmental transcription factor sine oculis homeobox homology 1 (SIX1) drives pulmonary fibrosis. However, the contribution of SIX1 to skin fibrosis and associated dermal fat loss remains unknown. Added value of this studyThe role of dermal fat loss in skin fibrosis is not fully understood. Studies have shown that adipocytes can transition to mesenchymal cells promoting fibrosis, consistent with loss of the dermal white adipose layer. Our research provides insight into a novel molecular mechanism of lipodystrophy important for skin fibrosis in SSc. We identified the upregulation of SIX1 in adipocytes in skin from patients with SSc which was associated with the progression of skin fibrosis. We found elevated Six1 in mouse dermal adipocytes of early fibrotic skin. Ubiquitous and adipose-specific loss of Six1 decreased markers of experimental skin fibrosis in mice which recapitulate cardinal features of SSc dermal fibrosis. Increased SIX1 expression is linked with elevated levels of Serpine1 the gene that codes for the protein plasminogen activator inhibitor (PAI)-1. This is important since PAI-1 is a known pro-fibrotic agent in the skin that contributes to the deposition of extracellular matrix (ECM) products. Implications of all the available evidenceFat atrophy may represent a targetable contributor to early systemic sclerosis manifestations. This is as it precedes skin fibrosis and the use of topical agent which are usually lipophilic can help us target dermal adipocytes. Our results show that SIX1 could be an important early marker for skin fibrosis in SSc that can also be targeted therapeutically.

molecular biology↗