Abstract
Choline (Ch) is an essential nutrient that seems to be involved in a wide variety of metabolic reactions and functions that affect the nervous system, while thioacetamide (TAA) is a well-known hepatotoxic agent. The induction of prolonged Ch-deprivation (CD) in rats receiving TAA (through the drinking water) provides an experimental model of mild progressive hepatotoxicity that could simulate commonly-presented cases in clinical practice. In this respect, the aim of this study was to investigate the effects of a 30-day dietary CD and/or TAA administration (300 mg/L of drinking water) on the serum total antioxidant status (TAS) and the activities of brain acetylcholinesterase (AChE), Na+,K+-ATPase and Mg2+-ATPase of adult rats. Twenty male Wistar rats were divided into four groups: A (control), B (CD), C (TAA), D (CD+TAA). Dietary CD was provoked through the administration of Ch-deficient diet. Rats were sacrificed by decapitation at the end of the 30-day experimental period and whole brain enzymes were determined spectrophotometrically. Serum TAS was found significantly lowered by CD (−11% vs Control, p < 0.01) and CD+TAA administration (−19% vs Control, p < 0.001), but was not significantly altered due to TAA administration. The rat brain AChE activity was found significantly increased by TAA administration (+11% vs Control, p < 0.01), as well as by CD+TAA administration (+14% vs Control, p < 0.01). However, AChE was not found to be significantly altered by the 30-day dietary CD. On the other hand, CD caused a significant increase in brain Na+,K+-ATPase activity (+16% vs Control, p < 0.05) and had no significant effect on Mg2+-ATPase. Exposure to TAA had no significant effect on Na+,K+-ATPase, but inhibited Mg2+-ATPase (−20% vs Control, p < 0.05). When administered to CD rats, TAA caused a significant decrease in Na+,K+-ATPase activity (−41% vs Control, p < 0.001), but Mg2+-ATPase activity was maintained into control levels. Our data revealed that an adult-onset 30-day dietary-induced CD had no effect on AChE activity. Treatment with TAA not only reversed the stimulatory effect of CD on adult rat brain Na+,K+-ATPase, but caused a dramatic decrease in its activity (−41%). Previous studies have linked this inhibition with metabolic phenomena related to TAA-induced fulminant hepatic failure and encephalopathy. Our data suggest that CD (at least under the examined 30-day period) is an unfavorable background for the effect of TAA-induced hepatic damage on Na+,K+-ATPase activity (an enzyme involved in neuronal excitability, metabolic energy production and neurotransmission).
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Notes
Ingridients of the Ch-deficient diet: sucrose, coconut oil, starch wheat, dextrine, extracted peanut meal, soy protein, corn oil, dicalcium phosphate, cellulose, potassium citrate, sodium chloride, magnesium oxide, L-cystine, vitamin A, vitamin D3, vitamin E (alpha-tocopherol), copper (copper sulfate pentahydrate), selenium (sodium selenite). Analysis: protein (12%), fat (16%), fiber (2%), ash (3.5%).
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Acknowledgments
This study was funded by the University of Athens. Many thanks are expressed to the medical students Marianna Almpani and Vassilios Memtsas for their assistance.
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Liapi, C., Al-Humadi, H., Zarros, A. et al. Combined thirty-day exposure to thioacetamide and choline-deprivation alters serum antioxidant status and crucial brain enzyme activities in adult rats. Metab Brain Dis 24, 441–451 (2009). https://doi.org/10.1007/s11011-009-9147-4
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DOI: https://doi.org/10.1007/s11011-009-9147-4