Glycolytic enzyme expression and pyruvate kinase activity in cultured fibroblasts from type 1 diabetic patients with and without nephropathy

详细信息    查看全文

• 作者：Elisabetta Iori ; Renato Millioni ; Lucia Puricelli ; Giorgio Arrigoni ; Livia Lenzini ; Roberto Trevisan ; Peter James ; Gian Paolo Rossi ; Lorenzo A. Pinna ; Paolo Tessari
• 关键词：Type 1 diabetic nephropathy ; Two-dimensional electrophoresis ; Human skin fibroblast
• 刊名：Biochimica et Biophysica Acta (BBA)/Molecular Basis of Disease
• 出版年：2008
• 出版时间：November 2008
• 年：2008
• 卷：1782
• 期：11
• 页码：627-633
• 全文大小：451 K

文摘

Since type 1 diabetes mellitus (T1DM) patients with nephropathy (DN+) are insulin-resistant, we aimed to identify (new) potential molecular sites involved in the alterations of glucose metabolism in these patients. We examined the expression of glycolytic enzymes in cultured fibroblasts from T1DM(DN+) patients as compared to those from T1DM patients without nephropathy (DN−) and from controls. Pyruvate kinase (PK) activity was also determined. Human skin fibroblasts were grown in normal glucose (6 mM). RNAs and proteins were analyzed, respectively, using cRNA microarray and two-dimensional electrophoresis followed by identification with mass spectrometry. PK activity was measured using a spectrophotometric assay. As compared to controls, increases in the gene expression of hexokinase, phosphoglucomutase, phosphofructokinase, aldolase and triosephosphate isomerase were found in T1DM(DN+) patients, but not in T1DM(DN−) patients. In T1DM(DN+) patients, the protein analysis showed an altered expression of three glycolytic enzymes: triosophosphate isomerase, enolase and PK. In addition, PK activity in fibroblasts from T1DM(DN+) patients was lower than that in T1DM(DN−) and in controls. In conclusion, this study reports novel alterations of enzymes involved in glucose metabolism that may be associated with the pathophysiology of insulin resistance and of renal damage in T1DM(DN+) patients.