Protective role of female gender in programmed accelerated renal aging in the rat

Area of Science:

• Nephrology
• Endocrinology
• Aging Research

Background:

• Kidney aging is characterized by reduced glomerular filtration rate (GFR), inflammation, and oxidative stress.
• The role of ovarian hormones in the accelerated progression of age-related kidney disease is not fully understood.

Purpose of the Study:

• To investigate the influence of ovarian hormones on programmed accelerated renal aging.
• To assess the interaction between ovarian hormones and aging processes in the kidney.
• To examine changes in angiotensin II receptor type 2 (AGTR2) expression in aging kidneys.

Main Methods:

• Utilized a rat model of developmentally programmed accelerated renal aging.
• Implemented ovariectomy to study the effects of estrogen absence.
• Analyzed kidney function (GFR), albuminuria, proteinuria, inflammatory markers, and tissue carbonyls over an 18-month period.
• Measured AGTR2 gene expression.

Main Results:

• Kidney function (GFR) declined with age, worsened by fetal exposure to a maternal low-protein diet and estrogen absence.
• Reduced GFR correlated with increased albuminuria, proteinuria, inflammation, and oxidative stress (tissue carbonyls).
• AGTR2 expression increased at 18 months in offspring from mothers on a low-protein diet, but not in controls.

Conclusions:

• Ovarian hormones significantly influence programmed accelerated renal aging and AGTR2 expression throughout life.
• Ovariectomy is identified as a risk factor for increased aging-related renal injury.
• Age-related renal injury and oxidative damage may be associated with alterations in AGTR2 expression.