Back to Search
Start Over
Administration of estradiol and progesterone modulate the activities of antioxidant enzyme and aminotransferases in naturally menopausal rats.
- Source :
-
Experimental gerontology [Exp Gerontol] 2005 Apr; Vol. 40 (4), pp. 295-302. - Publication Year :
- 2005
-
Abstract
- In aging tissues the oxidative stress increases due to decreased activity of antioxidant enzymes and proteolysis increases due to decreased activity of aminotransferases, which can be modified by hormonal replacement therapy (HRT). The aim of the present study was to determine the effect of HRT on the activities of an antioxidant enzyme superoxide dismutase (SOD) and aminotransferases like alanine aminotransferase (Ala-AT) and aspartate aminotransferase in different age groups (12, 18 and 24 months) of naturally menopausal rats. The rats were given the subcutaneous injection of 17beta-estradiol, progesterone and combination of estradiol and progesterone for 1 month. The activity of SOD, Ala-AT and Asp-AT was measured in the brain (cerebral hemisphere, CH), heart, liver, kidney and uterus. The activity of SOD decreased with age in all the tissues taken particularly in liver. After HRT the enzyme activities were increased as compared to age-matched controls in all the tissues of aging rats. The activities of transaminases (Ala-AT and Asp-AT) showed a decrease with age in all the tissues and administration of estradiol and combination of estradiol and progesterone further decreased both the aminotransferases. Our study elucidates that increased activity of SOD contributes in protection of cells from oxygen toxicity by catalyzing the dismutation of free radicals in tissues. Furthermore, the HRT probably decreases gluconeogenesis and proteolysis by decreasing the activities of Ala-AT and Asp-AT in aging rat tissues.
- Subjects :
- Aging metabolism
Alanine Transaminase drug effects
Alanine Transaminase metabolism
Animals
Antioxidants metabolism
Aspartate Aminotransferases drug effects
Aspartate Aminotransferases metabolism
Estradiol blood
Female
Menopause physiology
Oxidative Stress
Progesterone blood
Rats
Rats, Wistar
Superoxide Dismutase metabolism
Transaminases metabolism
Estradiol pharmacology
Estrogen Replacement Therapy
Progesterone pharmacology
Superoxide Dismutase drug effects
Transaminases drug effects
Subjects
Details
- Language :
- English
- ISSN :
- 0531-5565
- Volume :
- 40
- Issue :
- 4
- Database :
- MEDLINE
- Journal :
- Experimental gerontology
- Publication Type :
- Academic Journal
- Accession number :
- 15820610
- Full Text :
- https://doi.org/10.1016/j.exger.2005.01.004