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Changes in male rat urinary protein profile during puberty: a pilot study

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Title: Changes in male rat urinary protein profile during puberty: a pilot study
Authors: Vettorazzi, A
Wait, R
Nagy, J
Monreal, JI
Mantle, P
Item Type: Journal Article
Abstract: BACKGROUND: Androgen-dependent proteins (lipocalins) circulate in blood of male rats and mice and, being small (~ 18 kDa), pass freely into glomerular filtrate. Some are salvaged in proximal nephrons but some escape in urine. Several organic molecules can bind to these proteins causing, where salvage occurs, nephropathy including malignancy in renal cortex. In urine, both free lipocalins and ligands contribute to an increasingly-recognised vital biological role in social communication between adults, especially in the dark where reliance is on smell and taste. Crystal structure of the first-characterised lipocalin of male rats, α2u-globulin, has been determined and peptide sequences for others are available, but no study of occurrence during early puberty has been made. We have followed temporal occurrence in urine of juveniles (n = 3) for non-invasive pilot study by high resolution gradient mini-gel electrophoresis, tryptic digest of excised protein bands, and LC-MS/MS of digest to identify peptide fragments and assign to specific lipocalins. Study objective refers directly to external availability for social communication but also indirectly to indicate kinetics of circulating lipocalins to which some xenobiotics may bind and constitute determinants of renal disease. RESULTS: Mini-gels revealed greater lipocalin complexity than hitherto recognised, possibly reflecting post-translational modifications. Earliest patterns comprised rat urinary protein 1, already evident in Sprague-Dawley and Wistar strains at 36 and 52 days, respectively. By 44 and 57 days major rat protein (α2u-globulin) occurred as the progressively more dominant protein, though as two forms with different electrophoretic mobility, characterised by seven peptide sequences. No significant change in urinary testosterone had occurred in Wistars when major rat protein became evident, but testosterone surged by 107 days concomitant with the marked abundance of excreted lipocalins. CONCLUSIONS: Qualitative temporal changes in the composition of excreted lipocalins early in puberty, and apparent increase in major urinary protein as two resolvable forms, should catalyse systematic non-invasive study of urinary lipocalin and testosterone dynamics from early age, to illuminate this aspect of laboratory rodent social physiology. It could also define the potential temporal onset of nephrotoxic ligand risk, applicable to young animals used as toxicological models.
Issue Date: 15-Jun-2013
Date of Acceptance: 3-Jun-2013
URI: http://hdl.handle.net/10044/1/52236
DOI: https://dx.doi.org/10.1186/1756-0500-6-232
ISSN: 1756-0500
Publisher: BioMed Central
Start Page: 232
End Page: 232
Journal / Book Title: BMC Research Notes
Volume: 6
Copyright Statement: © 2013 Vettorazzi et al.; licensee BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Keywords: Animals
Male
Pilot Projects
Proteinuria
Rats
Rats, Sprague-Dawley
Rats, Wistar
Sexual Maturation
1199 Other Medical And Health Sciences
Bioinformatics
Publication Status: Published
Conference Place: England
Appears in Collections:Centre for Environmental Policy
Faculty of Medicine
Faculty of Natural Sciences



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