TY - JOUR
T1 - Post-transcriptional control of catalase expression in garlic-treated rats
AU - Pedraza-Chaverrí, José
AU - De Los Ángeles Granados-Silvestre, María
AU - Medina-Campos, Omar N.
AU - Maldonado, Perla D.
AU - Olivares-Corichi, Ivonne M.
AU - Ibarra-Rubio, María E.
N1 - Funding Information:
This work was presented in part at the 32nd Annual Meeting of the American Society of Nephrology, Miami, FL, November 1999, and has been published in abstract form (J Am Soc Nephrol 10: 632, 1999). The work was supported by DGAPA (IN203797), and Facultad de Química (PAIP 6190-03) from the National Autonomous University of Mexico (UNAM) and CONACYT (25441-M).
PY - 2001
Y1 - 2001
N2 - Regulation of catalase (CAT) expression, a major antioxidant enzyme that detoxifies H2O2, is very complex. Garlic is effective to prevent or ameliorate oxidative stress probably through its intrinsic antioxidant properties and/or to its ability to modify antioxidant enzyme expression. In this paper we studied the effect of a 2% garlic diet on the renal and hepatic CAT expression (mRNA levels, and enzyme activity, content, synthesis, and degradation). The study was made 2 weeks after feeding rats with a 2% garlic diet. CAT activity and content were measured by a spectrophotometric method and Western blot, respectively. CAT mRNA levels and CAT synthesis (kS) and degradation (kD) in vivo were measured by Northern blot and kinetic of reappearance of CAT activity after aminotriazole injection, respectively. Garlic-treatment decreased CAT activity and content, and CAT mRNA levels were unchanged in both tissues, kS decreased and kD remained unchanged in kidney and liver. The decrease in kS without changes in kD and CAT mRNA levels could explain the low CAT expression in garlic-fed rats. In vivo H2O2 generation in kidney and liver was markedly decreased in garlic-fed rats which could be due to a direct antioxidant effect of garlic. This may be the initial event in the garlic-fed rats that leads to the decreased CAT expression. Our data strongly suggest that the diminished renal and hepatic CAT expression in garlic-fed rats is mediated by post-transcriptional changes (mainly low translational efficiency) which could be an adaptation to the low H2O2.
AB - Regulation of catalase (CAT) expression, a major antioxidant enzyme that detoxifies H2O2, is very complex. Garlic is effective to prevent or ameliorate oxidative stress probably through its intrinsic antioxidant properties and/or to its ability to modify antioxidant enzyme expression. In this paper we studied the effect of a 2% garlic diet on the renal and hepatic CAT expression (mRNA levels, and enzyme activity, content, synthesis, and degradation). The study was made 2 weeks after feeding rats with a 2% garlic diet. CAT activity and content were measured by a spectrophotometric method and Western blot, respectively. CAT mRNA levels and CAT synthesis (kS) and degradation (kD) in vivo were measured by Northern blot and kinetic of reappearance of CAT activity after aminotriazole injection, respectively. Garlic-treatment decreased CAT activity and content, and CAT mRNA levels were unchanged in both tissues, kS decreased and kD remained unchanged in kidney and liver. The decrease in kS without changes in kD and CAT mRNA levels could explain the low CAT expression in garlic-fed rats. In vivo H2O2 generation in kidney and liver was markedly decreased in garlic-fed rats which could be due to a direct antioxidant effect of garlic. This may be the initial event in the garlic-fed rats that leads to the decreased CAT expression. Our data strongly suggest that the diminished renal and hepatic CAT expression in garlic-fed rats is mediated by post-transcriptional changes (mainly low translational efficiency) which could be an adaptation to the low H2O2.
KW - Catalase
KW - Garlic
KW - Post-transcriptional control
UR - http://www.scopus.com/inward/record.url?scp=0035126132&partnerID=8YFLogxK
U2 - 10.1023/A:1011050619406
DO - 10.1023/A:1011050619406
M3 - Artículo
C2 - 11216869
AN - SCOPUS:0035126132
SN - 0300-8177
VL - 216
SP - 9
EP - 19
JO - Molecular and Cellular Biochemistry
JF - Molecular and Cellular Biochemistry
IS - 1-2
ER -