Netrin as a Novel Biomarker and Its Therapeutic Implications in Diabetes Mellitus and Diabetes-Associated Complications
JOURNAL OF DIABETES RESEARCH
Authors: Yimer, Ebrahim M.; Zewdie, Kaleab Alemayehu; Hishe, Hailemichael Zeru
Abstract
Diabetes is a multifactorial metabolic syndrome and is one of the shared long-lasting illnesses globally. It is linked to long-term microvascular and macrovascular complications that contribute to disability, compromised quality of life, and reduction in lifespan, which eventually leads to death. This disease is not only incurring significant economic burden but also adversely affects the patients, caregivers, communities, and the society at large. The interruption of diabetes progress and its complications is a primary focus of scientific communities. In spite of various diagnostic modalities for diabetes, there is a limited marker to investigate the risk and progress of its complications. Netrin has recently received more attention as a biomarker of diabetes and a broader range of long-term complication. Therefore, the impetus of this review is to exhaustively discuss the role of Netrin as a potential biomarker and its therapeutic implication in diabetes and diverse sets of microvascular and macrovascular complications of diabetes. It also discourses the possible mechanisms of Netrin for the said pharmacological effect for a better understanding of the development and progression of diabetes and its complications in relation to this protein. It enables protective measures to be applied at the subclinical stage and the responses to preventive or therapeutic measures to be scrutinized. Besides, it might also facilitate the appraisal of novel therapeutic options for diabetes and various complications through modifying the endogenous Netrin and provide surrogate endpoints for intervention.
Netrin-1 mediates neuronal survival through PIKE-L interaction with the dependence receptor UNC5B
NATURE CELL BIOLOGY
Authors: Tang, Xiaoling; Jang, Sung-Wuk; Okada, Masashi; Chan, Chi-Bun; Feng, Yue; Liu, Yu; Luo, Shi-Wen; Hong, Yan; Rama, Nicolas; Xiong, Wen-Cheng; Mehlen, Patrick; Ye, Keqiang
Abstract
Netrins, a family of secreted molecules, have critical functions in axon guidance and cell migration during neuronal development(1,2). In addition to its role as a chemotropic molecule, netrin-1 also acts as a survival factor(3-7). Both UNC5 (that is, UNC5A, UNC5B, UNC5C or UNC5D) and DCC are transmembrane receptors for netrin-1 (refs 8, 9). In the absence of netrin-1, DCC and UNC5 act as dependence receptors and trigger apoptosis(3,6,10). However, how netrin-1 suppresses the apoptotic activity of the receptors remains elusive. Here we show that netrin-1 induces interaction of UNC5B with the brain-specific GtPase PIKe-L. this interaction triggers the activation of PtdIns-3-OH kinase signalling, prevents UNC5B's pro-apoptotic activity and enhances neuronal survival. Moreover, this process relies strongly on Fyn because PIKe-L is tyrosine phosphorylated in response to netrin-1, and the netrin-1-mediated interaction of UNC5B with PIKe-l is inhibited in Fyn-null mice. thus, PIKe-L acts as a downstream survival effector for netrin-1 through UNC5B in the nervous system.