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Landa-Moreno CI, Trejo-Hurtado CM, Lemus-de la Cruz J, Peña-Montes DJ, Murillo-Villicaña M, Huerta-Cervantes M, Montoya-Pérez R, Salgado-Garciglia R, Manzo-Avalos S, Cortés-Rojo C, Monribot-Villanueva JL, Guerrero-Analco JA, Saavedra-Molina A. Antioxidant Effect of the Ethyl Acetate Extract of Potentilla indica on Kidney Mitochondria of Streptozotocin-Induced Diabetic Rats. PLANTS (BASEL, SWITZERLAND) 2023; 12:3196. [PMID: 37765360 PMCID: PMC10538127 DOI: 10.3390/plants12183196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2023] [Revised: 08/17/2023] [Accepted: 09/05/2023] [Indexed: 09/29/2023]
Abstract
Diabetes mellitus (DM) is a metabolic disorder characterized by persistent hyperglycemia. This state may lead to an increase in oxidative stress, which contributes to the development of diabetes complications, including diabetic kidney disease. Potentilla indica is a traditional medicinal herb in Asia, employed in the treatment of several diseases, including DM. In this study, we investigated the antioxidant effect of the ethyl acetate extract of Potentilla indica both in vitro and on kidneys of streptozotocin-induced diabetic male rats. Firstly, phytochemicals were identified via UPLC-MS/MS, and their in vitro antioxidant capabilities were evaluated. Subsequently, male Wistar rats were assigned into four groups: normoglycemic control, diabetic control, normoglycemic treated with the extract, and diabetic treated with the extract. At the end of the treatment, fasting blood glucose (FBG) levels, creatinine, blood urea nitrogen (BUN), and uric acid were estimated. Furthermore, the kidneys were removed and utilized for the determination of mitochondrial reactive oxygen species (ROS) production, mitochondrial respiratory chain complex activities, mitochondrial lipid peroxidation, glutathione peroxidase (GSH-Px), superoxide dismutase (SOD), and catalase (CAT) activities. The in vitro findings showed that the major phytochemicals present in the extract were phenolic compounds, which exhibited a potent antioxidant activity. Moreover, the administration of the P. indica extract reduced creatinine and BUN levels, ROS production, and lipid peroxidation and improved mitochondrial respiratory chain complex activity and GSH-Px, SODk, and CAT activities when compared to the diabetic control group. In conclusion, our data suggest that the ethyl acetate extract of Potentilla indica possesses renoprotective effects by reducing oxidative stress on the kidneys of streptozotocin-induced diabetic male rats.
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Affiliation(s)
- Cinthia I. Landa-Moreno
- Instituto de Investigaciones Químico-Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Francisco J. Múgica S/N, Morelia 58030, Michoacán, Mexico; (C.I.L.-M.); (C.M.T.-H.); (J.L.-d.l.C.); (D.J.P.-M.); (M.M.-V.); (M.H.-C.); (R.M.-P.); (R.S.-G.); (S.M.-A.); (C.C.-R.)
| | - Cristian M. Trejo-Hurtado
- Instituto de Investigaciones Químico-Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Francisco J. Múgica S/N, Morelia 58030, Michoacán, Mexico; (C.I.L.-M.); (C.M.T.-H.); (J.L.-d.l.C.); (D.J.P.-M.); (M.M.-V.); (M.H.-C.); (R.M.-P.); (R.S.-G.); (S.M.-A.); (C.C.-R.)
| | - Jenaro Lemus-de la Cruz
- Instituto de Investigaciones Químico-Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Francisco J. Múgica S/N, Morelia 58030, Michoacán, Mexico; (C.I.L.-M.); (C.M.T.-H.); (J.L.-d.l.C.); (D.J.P.-M.); (M.M.-V.); (M.H.-C.); (R.M.-P.); (R.S.-G.); (S.M.-A.); (C.C.-R.)
| | - Donovan J. Peña-Montes
- Instituto de Investigaciones Químico-Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Francisco J. Múgica S/N, Morelia 58030, Michoacán, Mexico; (C.I.L.-M.); (C.M.T.-H.); (J.L.-d.l.C.); (D.J.P.-M.); (M.M.-V.); (M.H.-C.); (R.M.-P.); (R.S.-G.); (S.M.-A.); (C.C.-R.)
| | - Marina Murillo-Villicaña
- Instituto de Investigaciones Químico-Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Francisco J. Múgica S/N, Morelia 58030, Michoacán, Mexico; (C.I.L.-M.); (C.M.T.-H.); (J.L.-d.l.C.); (D.J.P.-M.); (M.M.-V.); (M.H.-C.); (R.M.-P.); (R.S.-G.); (S.M.-A.); (C.C.-R.)
| | - Maribel Huerta-Cervantes
- Instituto de Investigaciones Químico-Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Francisco J. Múgica S/N, Morelia 58030, Michoacán, Mexico; (C.I.L.-M.); (C.M.T.-H.); (J.L.-d.l.C.); (D.J.P.-M.); (M.M.-V.); (M.H.-C.); (R.M.-P.); (R.S.-G.); (S.M.-A.); (C.C.-R.)
| | - Rocío Montoya-Pérez
- Instituto de Investigaciones Químico-Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Francisco J. Múgica S/N, Morelia 58030, Michoacán, Mexico; (C.I.L.-M.); (C.M.T.-H.); (J.L.-d.l.C.); (D.J.P.-M.); (M.M.-V.); (M.H.-C.); (R.M.-P.); (R.S.-G.); (S.M.-A.); (C.C.-R.)
| | - Rafael Salgado-Garciglia
- Instituto de Investigaciones Químico-Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Francisco J. Múgica S/N, Morelia 58030, Michoacán, Mexico; (C.I.L.-M.); (C.M.T.-H.); (J.L.-d.l.C.); (D.J.P.-M.); (M.M.-V.); (M.H.-C.); (R.M.-P.); (R.S.-G.); (S.M.-A.); (C.C.-R.)
| | - Salvador Manzo-Avalos
- Instituto de Investigaciones Químico-Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Francisco J. Múgica S/N, Morelia 58030, Michoacán, Mexico; (C.I.L.-M.); (C.M.T.-H.); (J.L.-d.l.C.); (D.J.P.-M.); (M.M.-V.); (M.H.-C.); (R.M.-P.); (R.S.-G.); (S.M.-A.); (C.C.-R.)
| | - Christian Cortés-Rojo
- Instituto de Investigaciones Químico-Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Francisco J. Múgica S/N, Morelia 58030, Michoacán, Mexico; (C.I.L.-M.); (C.M.T.-H.); (J.L.-d.l.C.); (D.J.P.-M.); (M.M.-V.); (M.H.-C.); (R.M.-P.); (R.S.-G.); (S.M.-A.); (C.C.-R.)
| | - Juan Luis Monribot-Villanueva
- Red de Estudios Moleculares Avanzados, Clúster BioMimic, Instituto de Ecología, A.C., Xalapa 91073, Veracruz, Mexico; (J.L.M.-V.); (J.A.G.-A.)
| | - José Antonio Guerrero-Analco
- Red de Estudios Moleculares Avanzados, Clúster BioMimic, Instituto de Ecología, A.C., Xalapa 91073, Veracruz, Mexico; (J.L.M.-V.); (J.A.G.-A.)
| | - Alfredo Saavedra-Molina
- Instituto de Investigaciones Químico-Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Francisco J. Múgica S/N, Morelia 58030, Michoacán, Mexico; (C.I.L.-M.); (C.M.T.-H.); (J.L.-d.l.C.); (D.J.P.-M.); (M.M.-V.); (M.H.-C.); (R.M.-P.); (R.S.-G.); (S.M.-A.); (C.C.-R.)
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Simon L, Molina PE. Cellular Bioenergetics: Experimental Evidence for Alcohol-induced Adaptations. FUNCTION 2022; 3:zqac039. [PMID: 36120487 PMCID: PMC9469757 DOI: 10.1093/function/zqac039] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Revised: 08/08/2022] [Accepted: 08/10/2022] [Indexed: 01/07/2023] Open
Abstract
At-risk alcohol use is associated with multisystemic effects and end-organ injury, and significantly contributes to global health burden. Several alcohol-mediated mechanisms have been identified, with bioenergetic maladaptation gaining credence as an underlying pathophysiological mechanism contributing to cellular injury. This evidence-based review focuses on the current knowledge of alcohol-induced bioenergetic adaptations in metabolically active tissues: liver, cardiac and skeletal muscle, pancreas, and brain. Alcohol metabolism itself significantly interferes with bioenergetic pathways in tissues, particularly the liver. Alcohol decreases states of respiration in the electron transport chain, and activity and expression of respiratory complexes, with a net effect to decrease ATP content. In addition, alcohol dysregulates major metabolic pathways, including glycolysis, the tricarboxylic acid cycle, and fatty acid oxidation. These bioenergetic alterations are influenced by alcohol-mediated changes in mitochondrial morphology, biogenesis, and dynamics. The review highlights similarities and differences in bioenergetic adaptations according to tissue type, pattern of (acute vs. chronic) alcohol use, and energy substrate availability. The compromised bioenergetics synergizes with other critical pathophysiological mechanisms, including increased oxidative stress and accelerates cellular dysfunction, promoting senescence, programmed cell death, and end-organ injury.
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Affiliation(s)
- Liz Simon
- Department of Physiology and Comprehensive Alcohol-HIV/AIDS Research Center, Louisiana State University Health Sciences Center, 1901 Perdido Street, New Orleans, LA 70112, USA
| | - Patricia E Molina
- Department of Physiology and Comprehensive Alcohol-HIV/AIDS Research Center, Louisiana State University Health Sciences Center, 1901 Perdido Street, New Orleans, LA 70112, USA
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Bravo-Sánchez E, Peña-Montes D, Sánchez-Duarte S, Saavedra-Molina A, Sánchez-Duarte E, Montoya-Pérez R. Effects of Apocynin on Heart Muscle Oxidative Stress of Rats with Experimental Diabetes: Implications for Mitochondria. Antioxidants (Basel) 2021; 10:antiox10030335. [PMID: 33668280 PMCID: PMC7996266 DOI: 10.3390/antiox10030335] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Revised: 02/17/2021] [Accepted: 02/20/2021] [Indexed: 12/13/2022] Open
Abstract
Diabetes mellitus (DM) constitutes one of the public health problems today. It is characterized by hyperglycemia through a defect in the β-cells function and/or decreased insulin sensitivity. Apocynin has been tasted acting directly as an NADPH oxidase inhibitor and reactive oxygen species (ROS) scavenger, exhibiting beneficial effects against diabetic complications. Hence, the present study’s goal was to dissect the possible mechanisms by which apocynin could mediate its cardioprotective effect against DM-induced oxidative stress. Male Wistar rats were assigned into 4 groups: Control (C), control + apocynin (C+A), diabetes (D), diabetes + apocynin (D+A). DM was induced with streptozotocin. Apocynin treatment (3 mg/kg/day) was applied for 5 weeks. Treatment significantly decreased blood glucose levels and insulin resistance in diabetic rats. In cardiac tissue, ROS levels were higher, and catalase enzyme activity was reduced in the D group compared to the C group; the apocynin treatment significantly attenuated these responses. In heart mitochondria, Complexes I and II of the electron transport chain (ETC) were significantly enhanced in the D+A group. Total glutathione, the level of reduced glutathione (GSH) and the GSH/ oxidized glutathione (GSSG) ratio were increased in the D+A group. Superoxide dismutase (SOD) and the glutathione peroxidase (GSH-Px) activities were without change. Apocynin enhances glucose uptake and insulin sensitivity, preserving the antioxidant defense and mitochondrial function.
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Affiliation(s)
- Estefanía Bravo-Sánchez
- Instituto de Investigaciones Químico-Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Francisco J. Múgica S/N, Col. Felicitas del Río, Morelia 58030, Michoacán, Mexico; (E.B.-S.); (D.P.-M.); (S.S.-D.); (A.S.-M.)
| | - Donovan Peña-Montes
- Instituto de Investigaciones Químico-Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Francisco J. Múgica S/N, Col. Felicitas del Río, Morelia 58030, Michoacán, Mexico; (E.B.-S.); (D.P.-M.); (S.S.-D.); (A.S.-M.)
| | - Sarai Sánchez-Duarte
- Instituto de Investigaciones Químico-Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Francisco J. Múgica S/N, Col. Felicitas del Río, Morelia 58030, Michoacán, Mexico; (E.B.-S.); (D.P.-M.); (S.S.-D.); (A.S.-M.)
| | - Alfredo Saavedra-Molina
- Instituto de Investigaciones Químico-Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Francisco J. Múgica S/N, Col. Felicitas del Río, Morelia 58030, Michoacán, Mexico; (E.B.-S.); (D.P.-M.); (S.S.-D.); (A.S.-M.)
| | - Elizabeth Sánchez-Duarte
- Departamento de Ciencias Aplicadas al Trabajo, Universidad de Guanajuato Campus León, Eugenio Garza Sada 572, Lomas del Campestre Sección 2, León 37150, Guanajuato, Mexico
- Correspondence: (E.S.-D.); (R.M.-P.); Tel.: +521-477-2670-4900 (ext. 4833) (E.S.-D.); +521-(443)-322-3500 (ext. 4217) (R.M.-P.)
| | - Rocío Montoya-Pérez
- Instituto de Investigaciones Químico-Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Francisco J. Múgica S/N, Col. Felicitas del Río, Morelia 58030, Michoacán, Mexico; (E.B.-S.); (D.P.-M.); (S.S.-D.); (A.S.-M.)
- Correspondence: (E.S.-D.); (R.M.-P.); Tel.: +521-477-2670-4900 (ext. 4833) (E.S.-D.); +521-(443)-322-3500 (ext. 4217) (R.M.-P.)
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Peña-Montes DJ, Huerta-Cervantes M, Ríos-Silva M, Trujillo X, Cortés-Rojo C, Huerta M, Saavedra-Molina A. Effects of dietary iron restriction on kidney mitochondria function and oxidative stress in streptozotocin-diabetic rats. Mitochondrion 2020; 54:41-48. [DOI: 10.1016/j.mito.2020.07.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Revised: 06/10/2020] [Accepted: 07/08/2020] [Indexed: 12/22/2022]
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5
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Cortés-Rojo C, Clemente-Guerrero M, Saavedra-Molina A. Effects of D-amino acids on lipoperoxidation in rat liver and kidney mitochondria. Amino Acids 2006; 32:31-7. [PMID: 16868653 DOI: 10.1007/s00726-005-0356-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2005] [Accepted: 11/16/2005] [Indexed: 10/24/2022]
Abstract
The effects of the amino acids D-ser, D-asp, and D-ala on lipoperoxidation under conditions of hypertension, alcoholism, and ammonemia in rat liver and kidney mitochondria were studied. Under normal conditions, D-alanine increased in 54% free radicals production in liver mitochondria (p < 0.05). The D-amino acids had no effect on kidney mitochondria. D-ser and D-ala increased lipoperoxidation in spontaneously hypertensive rats (SHR) as compared with their normotensive genetic control Wistar-Kyoto (WKY) rats (p < 0.05). During hypertension and in oxidative stress in the presence of calcium, only D-ala produced 46% and 29% free radicals in liver and kidney mitochondria (p < 0.05), respectively. During chronic alcoholism, D-ser increased lipoperoxidation in 80% in kidney mitochondria (p < 0.05), as compared to control. During ammonemia, D-ser produced 41% free radicals.
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Affiliation(s)
- C Cortés-Rojo
- Instituto de Investigaciones Químico-Biológicas, Universidad Michoacana de San Nicolás de Hidalgo, Morelia, México
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6
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Riveros-Rosas H, Zentella de Piña M, Guinzberg R, Saldaña-Balmori Y, Julián-Sánchez A, Saavedra-Molina A, Piña E. Antagonism between the metabolic responses induced by epinephrine and piroxicam on isolated rat hepatocytes. Eur J Pharmacol 1999; 380:49-59. [PMID: 10513559 DOI: 10.1016/s0014-2999(99)00521-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Nonsteroidal anti-inflammatory drugs (NSAIDs) are one of the most employed therapeutic agents. They have a wide spectrum of biological effects, some of which are independent of cyclooxygenase inhibition, such as the alterations on the components of signal transduction systems. In particular, previous data from our laboratory suggested an antagonism between epinephrine and piroxicam, one of the most prescribed NSAIDs. Thus, this study deals with the epinephrine-piroxicam antagonism recorded for metabolic responses in isolated rat hepatocytes. The obtained results show that epinephrine stimulates lactate and ethanol consumption, stimulates glucose release from lactate only, and has no effect on cellular triacylglycerides content. Otherwise, in a dose-dependent basis, piroxicam stimulates lactate and ethanol consumption accompanied by an increase in triacylglycerides content, without changes in glucose release by hepatocytes. Piroxicam blocks the epinephrine-induced stimulation of glucose release from lactate, and epinephrine blocks the piroxicam-mediated increase in triacylglycerides content from lactate or ethanol. In contrast, the effects of epinephrine and piroxicam, promoting the consumption of lactate and ethanol, are not antagonized or added after the simultaneous administration of both compounds. This last result is probably related to the ability of both compounds to stimulate oxygen consumption. On isolated rat liver mitochondria, micromolar doses of piroxicam partially uncouple oxidative phosphorylation, and paradoxically stimulates an ATP-dependent mitochondrial function as citrullinogenesis. These results show for first time, on isolated rat hepatocytes, an antagonism between the metabolic responses of epinephrine and piroxicam, at the concentration found in plasma after its therapeutical administration.
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Affiliation(s)
- H Riveros-Rosas
- Departamento de Bioquímica, Facultad de Medicina, Universidad Nacional Autónoma de México, México, DF.
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Baraona E, Lieber CS. Alcohol and lipids. RECENT DEVELOPMENTS IN ALCOHOLISM : AN OFFICIAL PUBLICATION OF THE AMERICAN MEDICAL SOCIETY ON ALCOHOLISM, THE RESEARCH SOCIETY ON ALCOHOLISM, AND THE NATIONAL COUNCIL ON ALCOHOLISM 1998; 14:97-134. [PMID: 9751944 DOI: 10.1007/0-306-47148-5_5] [Citation(s) in RCA: 65] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Alcoholic fatty liver and hyperlipemia result from the interaction of ethanol and its oxidation products with hepatic lipid metabolism. An early target of ethanol toxicity is mitochondrial fatty acid oxidation. Acetaldehyde and reactive oxygen species have been incriminated in the pathogenesis of the mitochondrial injury. Microsomal changes offset deleterious accumulation of fatty acids, leading to enhanced formation of triacylglycerols, which are partly secreted into the plasma and partly accumulate in the liver. However, this compensatory mechanism fades with progression of the liver injury, whereas the production of toxic metabolites increases, exacerbating the lesions and promoting fibrogenesis. The early presence of these changes confers to the fatty liver a worse prognosis than previously thought. Alcoholic hyperlipemia results primarily from increased hepatic secretion of very-low-density lipoprotein and secondarily from impairment in the removal of triacylglycerol-rich lipoproteins from the plasma. Hyperlipemia tends to disappear because of enhanced lipolytic activity and aggravation of the liver injury. With moderate alcohol consumption, the increase in high-density lipoprotein becomes the predominant feature. Its mechanism is multifactorial (increased hepatic secretion and increased extrahepatic formation as well as decreased removal) and explains part of the enhanced cholesterol transport from tissues to bile. These changes contribute to, but do not fully account for, the effects on atherosclerosis and/or coronary heart disease attributed to moderate drinking.
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Affiliation(s)
- E Baraona
- Department of Medicine, Mount Sinai School of Medicine, New York, New York, USA
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Franke H, Kittner H, Berger P, Wirkner K, Schramek J. The reaction of astrocytes and neurons in the hippocampus of adult rats during chronic ethanol treatment and correlations to behavioral impairments. Alcohol 1997; 14:445-54. [PMID: 9305459 DOI: 10.1016/s0741-8329(96)00209-1] [Citation(s) in RCA: 90] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Chronic ethanol treatment of Wistar rats to 10% (v/v) ethanol over a period of 4, 12, and 36 weeks produced distinct alterations of the glial fibrillary acidic protein immunoreactivity (GFAP-IR) of dorsal hippocampal astrocytes. Ethanol consumption over a period of 4 weeks caused an increase in the total GFAP-IR of the astrocytes. Down-regulation of the total GFAP-IR was measured in all examined brain regions after 36 weeks of ethanol treatment. Prolonged ethanol treatment induced a significant loss of the total number of hippocampal pyramidal and dentate gyrus granule cells. Regional differences in the vulnerability to the neurotoxic effects of chronic ethanol intake over 36 weeks were found: CA3 > CA1 + CA2 > > CA4 > GD. In agreement with the degree of neuronal cell loss, ethanol-induced behavioral impairments were found. The acquisition of maze performance using a complex elevated labyrinth was deteriorated after 36 weeks of ethanol treatment, suggesting a deficit in learning and memory. These findings illustrate the importance of time-response analysis when determining the structural and functional changes produced by chronic ethanol treatment.
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Affiliation(s)
- H Franke
- Institute of Pharmacology and Toxicology, University of Leipzig, Germany
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Wirkner K, Damme B, Poelchen W, Pankow D. Effect of long-term ethanol pretreatment on the metabolism of dichloromethane to carbon monoxide in rats. Toxicol Appl Pharmacol 1997; 143:83-8. [PMID: 9073595 DOI: 10.1006/taap.1996.8077] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The present study investigates the influence of long-term ethanol (ETOH) treatment of rats [10% (v/v) for 4, 12, and 36 weeks] on the metabolism of DCM after its oral and inhalative uptake to CO. Biotransformation of DCM to CO as measured by carboxyhemoglobin (COHb) formation was stimulated after long-term ETOH treatment in rats. A single oral dose of DCM (6.2 mmol/kg body mass) caused a significant increase of COHb, the maximum of about 9% occurring approximately 6 hr after DCM administration. In comparison to this control, in the blood of rats pretreated with ETOH (10% v/v) for 4, 12, and 36 weeks COHb values of 18, 17, and 13%, respectively, were measured. Long-term ETOH treatment followed by inhalation of 100, 500, and 2500 ppm DCM for 4 hr stimulated the formation of COHb, compared to controls. The elevation of COHb level was accompanied by decreased concentrations of DCM in the blood. The reason for the elevated biotransformation of DCM was ascertained by means of the determination of p-nitrophenol and aniline hydroxylation in liver microsomes of rats after long-term ETOH treatment to be an increase in cytochrome P450-dependent enzyme activities.
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Affiliation(s)
- K Wirkner
- Institute of Pharmacology and Toxicology, University of Leipzig, Germany
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Wirkner K, Poelchen W. Influence of long-term ethanol treatment on rat liver aniline and p-nitrophenol hydroxylation. Alcohol 1996; 13:69-74. [PMID: 8837938 DOI: 10.1016/0741-8329(95)02015-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The present study investigates the influence of long-term ethanol (EtOH) treatment of rats [10% (v/v) for 1, 4, 12, and 36 weeks] on hepatic microsomal cytochrome P450 (P450) content and liver aniline and p-nitrophenol hydroxylation. Total P450 per liver was stimulated after EtOH treatment for 1, 4, and 12 weeks. In the case of longer EtOH treatment no additional stimulation in P450 content was observed. Aniline and p-nitrophenol hydroxylase activity increased in direct relation with the duration of EtOH consumption. The stimulation of both enzymatic activities was different. In comparison to controls, in rats treated with 10% (v/v) EtOH for 1, 4, 12, and 36 weeks, an increase in nitrocatechol formation (1.1-, 1.2-, 2.2-, and 2.8-fold, respectively) was found. In contrast, no effect was observed on the metabolism of aniline after 1 and 4 weeks of EtOH consumption. Aniline hydroxylation increased after 12 and 36 weeks of EtOH treatment only. Addition of EtOH in vitro had an inhibitory effect on both aniline and p-nitrophenol hydroxylation. With liver microsomes from controls as well as EtOH-treated rats the inhibition of p-nitrophenol hydroxylation was competitive in nature (Ki = 5.6 mM and Ki = 5.9 mM). In contrast, there was a competitive inhibition of aniline hydroxylation with liver microsomes from controls only. With microsomes from EtOH-treated rats a mixed inhibition was found.
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Affiliation(s)
- K Wirkner
- Department of Pharmacology and Toxicology, University of Leipzig, Germany
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11
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Adachi K, Matsuhashi T, Nishizawa Y, Usukura J, Popinigis J, Wakabayashi T. Studies on urea synthesis in the liver of rats treated chronically with ethanol using perfused livers, isolated hepatocytes, and mitochondria. Biochem Pharmacol 1995; 50:1391-9. [PMID: 7503789 DOI: 10.1016/0006-2952(95)02023-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Changes in urea synthesis in the liver of rats treated with 32% ethanol in the drinking water for up to 6 months were studied using perfused livers, isolated hepatocytes, and mitochondria. Results obtained from ethanol-treated rats are summarized as follows: (1) the mitochondria of the hepatocytes of rats treated with ethanol for 2 months or longer became enlarged to various degrees, (2) the levels of ammonia in the serum remained within a normal range, while those in liver tissue were elevated compared with the control, (3) urea synthesis from ammonia in perfused livers was decreased markedly, while that from citrulline remained in the normal range, (4) the activities of carbamyl phosphate synthetase (CPS; EC 2.7.2.5) and ornithine transcarbamylase (OTC; EC 2.1.3.3) in mitochondria were unchanged compared with those of the control, and (5) the levels of ATP in liver tissue and the ability of mitochondria to synthesize ATP were decreased markedly compared with the control. Both the level of ATP in the hepatocytes and the synthesis of urea from ammonia by perfused livers of rats treated with ethanol were resistant to externally added ethanol, while those of control animals were severely affected. These results suggest that the intracellular level of ATP is intimately related to urea synthesis in both control and ethanol-treated animals, and lowered levels of ATP may be a key factor in the suppression of urea synthesis in ethanol-treated animals.
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Affiliation(s)
- K Adachi
- Department of Cell Biology and Molecular Pathology, Nagoya University School of Medicine, Japan
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Ribiere C, Hininger I, Saffar-Boccara C, Sabourault D, Nordmann R. Mitochondrial respiratory activity and superoxide radical generation in the liver, brain and heart after chronic ethanol intake. Biochem Pharmacol 1994; 47:1827-33. [PMID: 8204099 DOI: 10.1016/0006-2952(94)90312-3] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Functional characteristics of mitochondria isolated from liver, brain and heart were studied in ethanol-fed rats using ethanol administration in drinking water as a model of moderate alcohol intoxication. Our results show a slight decrease in liver cytochrome aa3 content, the mitochondrial alteration which is most consistently observed during chronic ethanol feeding. In liver and heart mitochondria, ethanol consumption led to an increase in state 3 respiration with NAD(+)-linked substrates, whereas no changes were apparent in respiration rates with succinate as substrate. However a decrease was found in state 3 respiration with succinate in brain mitochondria isolated from ethanol-fed rats. Submitochondrial particles (SMP) were used to study the superoxide radical (O2-.) production at the level of antimycin-inhibited regions of the respiratory chain. It appears that there is no clear correlation between ethanol effects on respiration and O2-. production. Whereas O2-. generation remained unchanged in heart mitochondria, an elevation of O2-. generation was observed in brain mitochondria, and in contrast, the rate of O2-. production was decreased in liver mitochondria of the ethanol-group in comparison to the control-group. Our findings support a tissue specificity for the toxic effects of ethanol towards the mitochondria and indicate that mitochondrial free radical mechanisms are involved in ethanol-induced toxicity in the brain.
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Affiliation(s)
- C Ribiere
- Department of Biomedical Research on Alcoholism, Faculté de Médecine, Paris, France
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Van de Wiel JA, Fijneman PH, Teeuw KB, Van Ommen B, Noordhoek J, Bos RP. Influence of long-term ethanol treatment on rat liver biotransformation enzymes. Alcohol 1993; 10:397-402. [PMID: 8216887 DOI: 10.1016/0741-8329(93)90027-l] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The influence of rats' long-term ethanol consumption on liver enzymes that could be involved in the biotransformation of benzo(a)pyrene [B(a)P] has been studied. Male and female Wistar rats received an increasing amount of ethanol in their drinking water up to 15% (w/v) in three weeks. The ethanol content was kept at a concentration of 15% for another three weeks. One group of rats also received B(a)P in the last week of the ethanol treatment. Livers were isolated, and microsomal and cytosolic fractions were prepared. In every enzyme measurement sex differences were observed. Long-term ethanol consumption induced P450, especially aniline 4-hydroxylase (P4502E1). However, testosterone 6 beta-hydroxylase (P4503A2 and P4502C13) in males and testosterone 12 beta-hydroxylase in females were decreased. The phase 2 enzymes glutathione S-transferase (subunit 1) and epoxide hydrolase were also decreased in their activity. Our results support the hypothesis that the effect of long-term ethanol consumption on B(a)P biotransformation as found in in vivo and in vitro studies, consisting of lowered formation of phenolic and diolic metabolites, is the result of a decrease of constitutive P450 isoenzymes.
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Affiliation(s)
- J A Van de Wiel
- Department of Toxicology, Faculty of Medical Sciences, University of Nijmegen, Netherlands
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