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Osteopontin (OPN) and clusterin are secreted glycoproteins potentially associated with nerve function. Sudomotor dysfunction is associated with the development of foot ulcerations. The purpose of this study was to investigate the potential relationship of OPN and clusterin with sudomotor function (i.e., autonomic nerves that control sweating) in participants with type 2 diabetes mellitus (T2DM). Sudomotor function was assessed using SUDOSCAN® which measures electrochemical skin conductance (ESC) of the hands and feet. Demographics (e.g., age, gender, race, body mass index (BMI)), HbA1c, 25-hydroxyvitamin D, creatinine, OPN, and clusterin were also determined for the participants. Fifty individuals with T2DM (age = 59±11 years; 23/27 male/female; 13 African Americans) participated in this study. Lower ESC for the hands and feet were observed in African Americans versus Caucasians/Asians (p &lt; 0.05). No significant ESC differences were observed for good [HbA1c &lt;7%] versus poor [HbA1c ≥7%] glycemic control. With regard to gender, ESC values were lower for the hands for females (p &lt; 0.05). In linear regression with ESC for the hands or feet as the dependent variable, increased OPN levels, but not clusterin, were independently associated with reduced sudomotor function while adjusting for age, gender, race, BMI, and glycemic control (ESC hands model R 2  = 0.504, p &lt; 0.001; ESC feet model R 2  = 0.534, p &lt; 0.001). The association between OPN and reduced sudomotor function found in our study warrants further investigation to delineate the underlying mechanisms and determine if OPN is neuroprotective, involved in the pathogenesis of sudomotor dysfunction, or simply a bystander.

Osteopontin and clusterin levels in type 2 diabetes mellitus: differential association with peripheral autonomic nerve function