The etiology of the type 1 diabetes (T1D) is unclear but it has been shown that genetic factors influence the pathogenesis. In addition, several studies have shown that environmental factors likely contribute to the disease development. One such factor is virus infections, particularly the Coxsackie B viruses (CBVs), are among the main candidates and there has been numerous of studies showing association between these gut viruses and T1D. To be able to infect a certain cell it has to express an appropriate receptor and the main receptor for CVBs is the tight junction protein Coxsackie-Adenovirus-Receptor (CAR). The expression of the CAR protein has been shown to be increased during healing and during inflammation. The primary aim of this study is to determine the expression of CAR in pancreas especially on b-cell, and to what extent this expression is affected by the disease progress in T1D. The expression on human isolated islets, infected and un-infected cultured for prolonged periods will be studied also be studied. CAR expression in pancreas will also be studied in human pancreatic tissue from recent onset T1D donors, long standing T1D donors, islet autoantibody positive donors, T2D donors and controls to see if this protein “normally” is expressed in pancreas, especially on the b-cells. Studies are also on-going to see if the expression is affected by the auto- immunity in the pre diabetic and T1D islets. Preliminary results indicate that the expression level of CAR is significantly higher in islets from diabetes related donors compared to controls. It is also 10-100 fold higher expression in the endocrine tissue from pre diabetic and T1D donors compared to the exocrine tissue from the same donors.