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Abstract:

The effect of the in vivo administration of hexachlorobenzene (HCB) (100 mg/100 g bw) for 30 days, on the activities of brown adipose tissue (BAT) lipogenic enzymes, i.e. malic enzyme (ME), and glucose-6-phosphate dehydrogenase (G6PD) and the mitochondrial non lipogenic enzyme, L-glycerol-3-phosphate dehydrogenase (LG3PD), was studied in male Wistar rats, submitted to various neurohormonal manipulations. BAT ME, G6PD and LG3PD activities showed significant reductions in response to HCB treatment both in euthyroid and surgically thyroidectomized rats, showing that the effect does not depend on the presence of thyroid hormones. These results differ from those obtained for hepatic ME and G6PD activities, which increased in HCB intoxicated rats without alteration in LG3PD. HCB decreased BAT ME activity under BAT denervation. Administration of HCB resulted in time and dose-dependent decreases in the activity of BAT malic enzyme. The basal activity of ME was increased in hypothyroid rats, while that of LG3PD was reduced. A stimulatory effect of receptor-saturating doses of triiodothyronine (T 3 ) (50 μg/100 g body weight) was observed on BAT ME and LG3PD activities in thyroidectomized rats, showing that the enzymes responded to thyroid hormone stimulation in a normal manner. The stimulatory effect of saturating doses of T 3 on ME and LG3PD was reduced by HCB. The results presented herein unequivocally show that brown adipose tissue is a specific target in HCB-induced toxicity, which in turn involves severe alterations in the regulation of BAT lipogenesis.

Registro:

Documento: Artículo
Título:Effect of hexachlorobenzene on NADPH-generating lipogenic enzymes and L-glycerol-3-phosphate dehydrogenase in brown adipose tissue
Autor:Alvarez, L.; Randi, A.; Alvarez, P.; Kölliker Frers, R.; Kleiman De Pisarev, D.L.
Filiación:Depto. de Bioquímica Humana, Facultad de Medicina, Universidad de Buenos Aires, Vidal 2483, 8O B, 1428 Capital Federal, Argentina
Palabras clave:Brown adipose tissue; Glucose-6-phosphate dehydrogenase; Hexachlorobenzene; L-glycerol-3-phosphate dehydrogenase; Lipogenic enzymes; Liver; Malic enzyme,; Thyroid hormones; glucose 6 phosphate dehydrogenase; glycerol 3 phosphate dehydrogenase; hexachlorobenzene; liothyronine; malate dehydrogenase (decarboxylating); reduced nicotinamide adenine dinucleotide phosphate; thyroid hormone; animal cell; animal experiment; animal model; animal tissue; article; brown adipose tissue; controlled study; energy balance; enzyme activity; hypothyroidism; lipogenesis; male; nonhuman; rat; thyroidectomy; time
Año:1999
Volumen:22
Número:6
Página de inicio:436
Página de fin:445
DOI: http://dx.doi.org/10.1007/BF03343587
Título revista:Journal of Endocrinological Investigation
Título revista abreviado:J. Endocrinol. Invest.
ISSN:03914097
CODEN:JEIND
CAS:glucose 6 phosphate dehydrogenase, 37259-83-9, 9001-40-5; glycerol 3 phosphate dehydrogenase, 9001-49-4; hexachlorobenzene, 118-74-1, 55600-34-5; liothyronine, 6138-47-2, 6893-02-3; malate dehydrogenase (decarboxylating), 9028-46-0, 9074-02-6, 9080-52-8; reduced nicotinamide adenine dinucleotide phosphate, 53-57-6
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03914097_v22_n6_p436_Alvarez

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Citas:

---------- APA ----------
Alvarez, L., Randi, A., Alvarez, P., Kölliker Frers, R. & Kleiman De Pisarev, D.L. (1999) . Effect of hexachlorobenzene on NADPH-generating lipogenic enzymes and L-glycerol-3-phosphate dehydrogenase in brown adipose tissue. Journal of Endocrinological Investigation, 22(6), 436-445.
http://dx.doi.org/10.1007/BF03343587
---------- CHICAGO ----------
Alvarez, L., Randi, A., Alvarez, P., Kölliker Frers, R., Kleiman De Pisarev, D.L. "Effect of hexachlorobenzene on NADPH-generating lipogenic enzymes and L-glycerol-3-phosphate dehydrogenase in brown adipose tissue" . Journal of Endocrinological Investigation 22, no. 6 (1999) : 436-445.
http://dx.doi.org/10.1007/BF03343587
---------- MLA ----------
Alvarez, L., Randi, A., Alvarez, P., Kölliker Frers, R., Kleiman De Pisarev, D.L. "Effect of hexachlorobenzene on NADPH-generating lipogenic enzymes and L-glycerol-3-phosphate dehydrogenase in brown adipose tissue" . Journal of Endocrinological Investigation, vol. 22, no. 6, 1999, pp. 436-445.
http://dx.doi.org/10.1007/BF03343587
---------- VANCOUVER ----------
Alvarez, L., Randi, A., Alvarez, P., Kölliker Frers, R., Kleiman De Pisarev, D.L. Effect of hexachlorobenzene on NADPH-generating lipogenic enzymes and L-glycerol-3-phosphate dehydrogenase in brown adipose tissue. J. Endocrinol. Invest. 1999;22(6):436-445.
http://dx.doi.org/10.1007/BF03343587