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• W1972241024 abstract "The influence of the two antibiotics tetracycline hydrochloride (T) and penicillin G sodium (P) on PGI2 synthesis by the male rat thoracic aorta and day-20 pregnant rat myometrium was investigated in vitro using a rat platelet antiaggregatory bioassay method. Pretreatment of the tissues for 30 min at 37 degrees C with T (21-168 microM) or P (28-224 microM) significantly inhibited PGI2 synthesis in absence or presence of exogenous arachidonic acid (AA) (16.6 microM), (P less than 0.01, n = 5-6). Furthermore, pretreatment of rats with the two drugs (T 11 and P 175 mu mole kg-1 for 30 min) significantly antagonised AA (4 n mole kg-1)-induced hypotension in urethane-anaesthetised rats. They also (T 0.5-4 and P 1-6 microM) antagonised AA-induced aggregation in rabbit citrated platelet-rich plasma. T failed to affect ADP-induced aggregation to any significant level whereas P (3-6 microM) reduced ADP-induced aggregation. The drugs seemed to interfere with the action of the PG endoperoxide synthase (or PG cyclooxygenase) enzyme resulting in decreased formation of PGG2 and PGH2. Such an effect may have resulted from the induced formation of toxic [OH-] radicals and/or inhibition of O2 uptake by the tissues under the influence of the drugs. The demonstrated inherent property of these two antibiotics to inhibit the synthesis of the potent vasodilator, platelet antiaggregatory, anticonvulsant and inhibitor of gastric acid secretion--PGI2, may partly contribute towards better understanding of the biochemical mechanisms that underlie some of the previously known but poorly understood actions of these antibiotics. Furthermore, since good evidence exists for the involvement of excessive uterine prostaglandin synthesis in dysmenorrhoea and premature deliveries, it is suggested that the potential benefits of T or P in these two disorders be investigated." @default.
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• W1972241024 date "1991-09-01" @default.
• W1972241024 modified "2023-09-24" @default.
• W1972241024 title "Influence of chemotherapeutic agents on prostacyclin synthesis. II. Effects of tetracycline and penicillin G on prostacyclin synthesis by the rat thoracic aorta and myometrial tissues" @default.
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• W1972241024 doi "https://doi.org/10.1016/0952-3278(91)90142-r" @default.
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