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Fluctuations of acetylcholinesterase in the mouse spinal cord and in vivo sodium effect during the development of morphine tolerance, dependence, and withdrawal

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Abstract

Tolerance to and physical dependence on morphine were produced and assessed in Swiss inbred albino mice by giving morphine sulphate (s.c.) three times a day for a period of 15 days in an increasing dose of 10 mg/kg every 24 hours. Physical dependence was assessed taking naloxone induced jumping as well as weight loss during normal withdrawal into consideration. The effect of sodium ions in the potency of naloxone in antagonizing morphine's effect was also analyzed. The spinal cord was assayed for acetylcholinesterase employing both biochemical and histochemical parameters. It was found that the amount of the enzyme increased with the development of tolerance but the amount decreased as the animals became physically dependent. However, the values were significantly above the control. Administration of naloxone brought about a sudden and significant fall in the level of the enzyme. Normal withdrawal too was characterized by a weak activity of the enzyme. It has been found that sodium ions can influence naloxone antagonism in an in vivo system.

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Author notes

  1. K. P. Mohanakumar &  P. P. Sood

    Present address: Division of Pharmacology and Experimental Therapeutics, Indian Institute of Chemical Biology, 4 Raja S. C. Mullick Road Jadavpur, 700032, Calcutta, India

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  1. Department of Biosciences, Saurashtra University, 360005, Rajkot, India

    K. P. Mohanakumar &  P. P. Sood

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Mohanakumar, K.P., Sood, P.P. Fluctuations of acetylcholinesterase in the mouse spinal cord and in vivo sodium effect during the development of morphine tolerance, dependence, and withdrawal. Neurochem Res 11, 505–520 (1986). https://doi.org/10.1007/BF00965320

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