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Protective effect of prostaglandins D2, E1 and I2 against cerebral hypoxia/anoxia in mice

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Summary

  1. 1.

    The protective effect of prostaglandins (PGs) against cerebral hypoxia/anoxia was investigated with a variety of experimental models in relation to their CNS depressant effects in mice. Furthermore, the effect of PGs on the changes of cerebral energy metabolites and cyclic nucleotide was examined in hypoxic mice. Mice were given s.c. doses of PGs 30 min before tests. Among the PGs tested, treatment with PGD2, PGE1 and PGI2 Na showed a consistent and dose-dependent protection against cerebral anoxia induced by all models studied: histotoxic anoxia by KCN, hypobaric hypoxia, normobaric hypoxia and decapitation-induced gasping. However, PGA1, PGA2, PGB1, PGB2, PGE2, PGF1α, PGF2α and 6-keto-PGF1α at a dose of 3mg/kg were without effect against normobaric hypoxia and gasping duration.

  2. 2.

    The three PGs, i.e. PGD2, PGE1 and PGI2 which showed anti-hypoxic effects decreased locomotor activity and potentiated hexobarbital-induced sleep. On the other hand, PGE2, PGA1, PGA2 and PGB2 also caused a decrease in locomotor activity. Similarly, PGE2 and PGA1 caused a potentiation of hexobarbital-induced sleep, but interestingly they did not cause clear-cut increase in cerebral resistance to hypoxia, in contrast with the former three PGs. Thus general depression of CNS function appears not to be responsible for the PGD2-, PGE1- and PGI2-induced increase in cerebral resistance to hypoxia.

  3. 3.

    The levels of Cr-P and ATP were significantly reduced and those of ADP and AMP were markedly elevated in hypoxic brain, resulting in a decrease in a calculated energy charge potential. The lactate level and lactate/pyruvate ratio increased and the glucose level decreased markedly. Also, an elevation in cyclic AMP was observed in hypoxic brain. Treatment with 1–3 mg/kg, s.c. of PGD2 or PGE1 and 0.1–3 mg/kg, s.c. of PGI2 Na was found to be effective against the changes of energy metabolites and cyclic nucleotide in hypoxic brain.

  4. 4.

    Thus, PGD2, PGE1 and PGI2 possess a protective effect against cerebral hypoxia/anoxia by various causing, and it was suggested that these protective effect was related to an increase in the energy reserve available or a decrease in the cerebral energy demand.

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Authors and Affiliations

  1. Department of Pharmacology, Research Laboratories, Dainippon Pharmaceutical Co., Ltd., Suita-shi, 564, Osaka, Japan

    Yoshinobu Masuda, Yuko Ochi, Yoshiaki Ochi, Tadahiko Karasawa, Naonobu Hatano, Toshiaki Kadokawa & Masanao Shimizu

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  1. Yoshinobu Masuda
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  2. Yuko Ochi
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  3. Yoshiaki Ochi
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  6. Toshiaki Kadokawa
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Masuda, Y., Ochi, Y., Ochi, Y. et al. Protective effect of prostaglandins D2, E1 and I2 against cerebral hypoxia/anoxia in mice. Naunyn-Schmiedeberg's Arch. Pharmacol. 334, 282–289 (1986). https://doi.org/10.1007/BF00508783

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  • DOI: https://doi.org/10.1007/BF00508783

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