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Cell senescence in rat kidneys in vivo increases with growth and age despite lack of telomere shortening.

Abstract：

BACKGROUND:Somatic cells in vitro have a finite life expectancy before entering a state of senescence, but it is unclear whether this state occurs in vivo in kidney development, growth, and aging. We previously showed that human kidney cortex displays telomere shortening with age. In this study, we compared the structural and functional changes in rat kidney with age to phenomena associated with cellular senescence in vitro. METHODS:We assessed the changes in Fischer 344 rat kidneys from age 1 to 9 months to define growth and development and from age 9 to 24 months to define aging. RESULTS:Rat kidney telomeres were approximately 35 to 40 kb long and did not shorten significantly. Expression of mRNA for p16INK4a, a characteristic senescence gene in vitro, was undetectable in most young rats but rose 27 fold during growth and a further 72-fold during aging. p16INK4a protein was localized to the nucleus and increased with age. p16INK4a mRNA also increased in other tissues. Lipofuscin and senescence-associated beta-galactosidase increased in epithelium with growth and aging and their occurrence was significantly associated with each other. Lipofuscin was particularly found in atrophic nephrons. CONCLUSION:We conclude that cell senescence occurs in both growth and aging in rat kidney and may contribute to the age-related pathology. These changes are not due to telomere shortening, but may reflect cumulative environmental stress.

journal_name

Kidney Int

journal_title

Kidney international

authors

Melk A,Kittikowit W,Sandhu I,Halloran KM,Grimm P,Schmidt BM,Halloran PF

doi

10.1046/j.1523-1755.2003.00032.x

subject

Has Abstract

pub_date

2003-06-01 00:00:00

pages

2134-43

issue

6

eissn

0085-2538

issn

1523-1755

pii

S0085-2538(15)49130-6

journal_volume

63

pub_type

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