The biological function of type I receptors of bone morphogenetic protein in bone
Shuxian Lin , Kathy K H Svoboda , Jian Q Feng , Xinquan Jiang
Bone Research ›› 2016, Vol. 4 ›› Issue (1) : 16005
Bone morphogenetic proteins (BMPs) have multiple roles in skeletal development, homeostasis and regeneration. BMPs signal via type I and type II serine/threonine kinase receptors (BMPRI and BMPRII). In recent decades, genetic studies in humans and mice have demonstrated that perturbations in BMP signaling via BMPRI resulted in various diseases in bone, cartilage, and muscles. In this review, we focus on all three types of BMPRI, which consist of activin-like kinase 2 (ALK2, also called type IA activin receptor), activin-like kinase 3 (ALK3, also called BMPRIA), and activin-like kinase 6 (ALK6, also called BMPRIB). The research areas covered include the current progress regarding the roles of these receptors during myogenesis, chondrogenesis, and osteogenesis. Understanding the physiological and pathological functions of these receptors at the cellular and molecular levels will advance drug development and tissue regeneration for treating musculoskeletal diseases and bone defects in the future.
Molecular biology: Signaling receptors tied to bone disease
Understanding how a group of receptors activate growth factors called bone morphogenetic proteins (BMPs) could lead to new drug targets. BMPs are essential for proper development, and diseases of the bone, cartilage, and muscles have all been linked to aberrant BMP signaling. In a review article, a team led by Xinquan Jiang from Shanghai Jiao Tong University in China and Jian Feng from Texas A&M Baylor College of Dentistry in the USA discuss the essential roles of cell-surface BMP “type I” receptors in bone formation. Animal models have revealed the molecular ways in which all three kinds of type I receptors have distinct biological functions in a variety of cells. The authors note that modulating BMP signaling through these receptors could one day help patients with bone and muscle defects.
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