The study in the level of 1α-hydroxylase in kidney tissue and the variation of serum calcium in rats with severe acute pancreatitis / 中华急诊医学杂志

ABSTRACT

Objective To investigate the renal level of 1o-hydroxylase and the change of serum calcium in rats with severe acute pancreatitis,and their correlation.Methods Eighty male Wistar rats were randomly (random number) divided into two groupssham operation group (SO group),severe acute pancreatitis group (SAP group),and each group was further randomly divided into 1 h,3 h,6 h,and 12 h subgroups (n =10).Severe acute pancreatitis model was made by retrograde infusion with 5％ sodium taurocholate solution into the biliopancreatic duct,rats were sacrificed at 1 h,3 h,6 h,and 12 h separately after modeling.The levels of serum amylase,serum calcium,serum urea nitrogen,serum creatinine,serum 1,25-dihydroxy vitamin D3 were measured,and the level of lα-hydroxylase protein in the kidney was determined with immunohistochemistry and Western blotting.The histopathologic changes of kidney tissue were observed under light microscope and the changes of the proximal tubular epithelial cell were observed under electron microscope.Results Compared with SO group,the levels of serum amylase,serum urea nitrogen,and serum creatinine were higher in SAP group,but the levels of serum calcium and 1,25-dihydroxy vitamin D3 decreased at 3,6,and 12 h,and the renal level of 1 α-hydroxylase also decreased at 3,6,and 12 h after modeling.In SAP group,the levels of serum calcium,serum 1,25-dihydroxy vitamin D3 and the renal level of 1 α-hydroxylase gradually decreased,and the renal level of 1 α-hydroxylase and the level of serum 1,25-dihydroxy vitamin D3 had positive correlation at 3 h,6 h,and 12 h (r =0.93,P ＜0.01; r=0.951,P ＜0.01; r =0.92,P ＜0.01; r =0.878,P ＜0.01),and the renal level of 1α-hydroxylase and the level of serum calcium had positive correlation at 3 h,6 h,and 12 h (r =0.975,P ＜0.01; r=0.946,P＜0.01; r=0.747,P＜0.01).Conclusions Intheearly course of SAP,the lowered activity of 1 α-hydroxylase may play an important role in the development of hypocalcemia.