Abstract:
:Accumulation of carboxymethylated proteins (CML-proteins) is taken as a biomarker of glycoxidative stress which is thought to contribute to the age-related impairment in tissue and cell function. To investigate the occurrence and extent of glycoxidative damage with aging in rat kidney, serum and urine, we have prepared a polyclonal antibody against CML-modified bovine serum albumin. We subsequently used it for immunolocalization and in enzyme-linked immunosorbent assays to evaluate CML-protein content. In the serum, CML-protein level was 1.43+/-0.14 pmol CML/micrograms protein at 3 months and significantly increased by 50% from 10 to 27 months (1.50+/-0.14 pmol CML/micrograms protein vs 2.27+/-0.26 pmol CML/micrograms protein), albumin and transferrin being the main modified proteins. In the urine, CML-protein level was 2.50+/-0.14 pmol CML/micrograms protein at 3 months and markedly increased from 10 months (2.99+/-0.24 pmol CML/micrograms protein) to 27 months (3.76+/-0.25 pmol CML/micrograms protein), with albumin as the main excreted modified protein. Immunolocalization of CML-proteins in kidney provided evidence for an age-dependent increased accumulation in extracellular matrices. Intense staining of the glomerular basement membrane (GBM), Bowman's capsule, and the tubular basement membrane was found. Additionally, the CML content for collagen from GBM was 195.85+/-28.95 pmol CML/microgrms OHPro at 3 months and significantly increased from 10 months (187.61+/-21.99 pmol CML/micrograms OHPro) to 27 months (334.55+/-62.21 pmol CML/micrograms OHPro). These data show that circulating CML-protein level in serum and urine and CML accumulation in nephron extracellular matrices with aging are increasing in parallel. The CML-protein measurement in serum and urine may thus be used as an index for the assessment of age-associated glycoxidative kidney damage.
journal_name
Arch Biochem Biophysjournal_title
Archives of biochemistry and biophysicsauthors
Hamelin M,Borot-Laloi C,Friguet B,Bakala Hdoi
10.1016/s0003-9861(02)00735-xsubject
Has Abstractpub_date
2003-03-15 00:00:00pages
215-22issue
2eissn
0003-9861issn
1096-0384pii
S000398610200735Xjournal_volume
411pub_type
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