title: Effects of aging on glomerular function and number in living kidney donors.
abstract: To elucidate the pathophysiologic changes in the kidney due to aging, we used physiological, morphometric, and imaging techniques to quantify GFR and its determinants in a group of 24 older (≥ 55 years) compared to 33 younger (≤ 45 years) living donors. Mathematical modeling was used to estimate the glomerular filtration coefficients for the whole kidney (K(f)) and for single nephrons (SNK(f)), as well as the number of filtering glomeruli (N(FG)). Compared to younger donors, older donors had a modest (15%) but significant depression of pre-donation GFR. Mean whole-kidney K(f), renocortical volume, and derived N(FG) were also significantly decreased in older donors. In contrast, glomerular structure and SNK(f) were not different in older and younger donors. Derived N(FG) in the bottom quartile of older donors was less than 27% of median-derived N(FG) in the two kidneys of younger donors. Nevertheless, the remaining kidney of older donors exhibited adaptive hyperfiltration and renocortical hypertrophy post-donation, comparable to that of younger donors. Thus, our study found the decline of GFR in older donors is due to a reduction in K(f) attributable to glomerulopenia. We recommend careful monitoring for and control of post-donation comorbidities that could exacerbate glomerular loss.
authors.affiliation: Division of Nephrology, Department of Medicine, Stanford University, Palo Alto, California 94304-1599, USA. jane.tan@stanford.edu
authors.forename: Jane C
authors.initials: JC
authors.lastname: Tan
authors.forename: Stephan
authors.initials: S
authors.lastname: Busque
authors.forename: Biruh
authors.initials: B
authors.lastname: Workeneh
authors.forename: Bing
authors.initials: B
authors.lastname: Ho
authors.forename: Geraldine
authors.initials: G
authors.lastname: Derby
authors.forename: Kristina L
authors.initials: KL
authors.lastname: Blouch
authors.forename: F Graham
authors.initials: FG
authors.lastname: Sommer
authors.forename: Byard
authors.initials: B
authors.lastname: Edwards
authors.forename: Bryan D
authors.initials: BD
authors.lastname: Myers
mesh_terms: D000328:Adult; D000368:Aged; D000375:Aging / Q000502:physiology*; D005260:Female; D005919:Glomerular Filtration Rate; D006801:Humans; D007678:Kidney Glomerulus / Q000473:pathology / Q000502:physiology*; D016030:Kidney Transplantation; D019520:Living Donors; D008297:Male; D008875:Middle Aged
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