Transcriptomics

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Anoctamin 1 controls bone resorption by coupling Cl- channel activation with RANKL-RANK signaling transduction


ABSTRACT: Osteoclast over-activation leads to bone loss and chloride homeostasis is fundamental for osteoclast function. The calcium-activated chloride channel Anoctamin 1 (also known as TMEM16A) is an important chloride channel involved in many physiological processes. However, its role in osteoclasts remains unresolved. Here, we identify the existence of Anoctamin 1 in osteoclasts and show that its expression positively correlates with osteoclast activity. Osteoclast-specific Anoctamin 1 knockout mice exhibit increased bone mass and decreased bone resorption. Mechanistically, Anoctamin 1 deletion increases intracellular Cl- concentration, decreases H+ secretion and reduces bone resorption. Notably, Anoctamin 1 physically interacts with RANK and this interaction is dependent upon Anoctamin 1 channel activity, jointly promoting RANKL-induced downstream signaling pathways. Anoctamin 1 protein levels are substantially increased in osteoporosis patients and this closely correlates with osteoclast activity. Finally, Anoctamin 1 deletion significantly alleviates ovariectomy induced osteoporosis. These results collectively establish Anoctamin 1 as an essential regulator in osteoclast function and suggest a potential therapeutic target for osteoporosis.

ORGANISM(S): Mus musculus

PROVIDER: GSE193800 | GEO | 2022/05/17

REPOSITORIES: GEO

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