Effects of Tamm-Horsfall Protein and Albumin on Calcium Oxalate Crystallization and Importance of Sialic Acids

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Title:	Effects of Tamm-Horsfall Protein and Albumin on Calcium Oxalate Crystallization and Importance of Sialic Acids
Authors:	陳汶吉(Chen Wen-Chi);林和昇(Lin HS);陳慧毅(Huey-Yi Chen);石清華(Shih CH);李家維(Li CW)
Contributors:	中醫學院中西醫結合研究所;中國附醫泌尿部
Date:	2001-03
Issue Date:	2009-08-20 19:18:47 (UTC+8)
Abstract:	Background: Tamm-Horsfall protein and human serum albumin are common urinary proteins that show uncertain inhibitory action on the crystallization of calcium oxalate monohydrate. Materials and Methods: Batch experiments on crystal nucleation, growth, and aggregation were performed using purified Tamm-Horsfall protein and albumin before and after enzymatic removal of sialic acids from the proteins. Results: At a concentration of 100 nM, both Tamm-Horsfall protein and albumin promoted the time of crystal nucleation by 18.4% and 8.9%, respectively, relative to the control. However, both of the proteins exerted an inhibitory effect on crystal growth, with the IC50 being 7.27 nM for Tamm-Horsfall protein and 37.5 nM for albumin. The inhibition of crystal aggregation was 81.82% by Tamm-Horsfall protein 100 nM but only 54.55% at 50 nM after enzymatic removal of the sialic acid. Instead of increasing the inhibition, the effect was changed to promotion after an increase in the concentration of Tamm-Horsfall protein to more than 500 nM for native protein and to more than 100 nM for the enzymatic digest. Albumin showed little change after enzymatic treatment and maintained a maximal inhibitory effect of 72.73% on crystal aggregation when the concentration reached to 100 nM. Conclusion: Because the promotion of nucleation could lessen the subsequent saturation of a calcium oxalate solution, it is concluded that Tamm-Horsfall protein and albumin show an overall effect of inhibition on crystallization in vitro. The inhibitory effect of Tamm-Horsfall protein is partly related to sialic acid.
Relation:	Molecular urology 5(1):1~5
Appears in Collections:	[Graduate Institute of Integrated Medicine] Journal articles

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