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- W1997358556 abstract "This study compared the pharmacological activity of venom from male and female white-tailed spiders (L. cylindrata). In guinea-pig ileum, male L. cylindrata venom (1-10 microg/ml) caused dose-dependent contractions. The response to venom (5 microg/ml) was significantly inhibited by mepyramine (0.5 microM). Venom (5-50 microg/ml) from female L. cylindrata had no contractile activity in this tissue. However, female L. cylindrata venom (50 microg/ml) inhibited electrically-evoked twitches of guinea-pig ileum. This inhibitory effect was attenuated by 8-phenyltheophylline (10 microM) or by prior exposure of venom to adenosine deaminase. In the rat vas deferens, male (5 microg/ml) and female (50 microg/ml) L. cylindrata venom inhibited electrically-evoked twitches. 8-Phenyltheophylline (20 microM) significantly attenuated the response to female L. cylindrata venom, while the histamine H(2)- and H(3)-receptor antagonists ranitidine (10 microM) and thioperamide (0.2 microM) significantly attenuated the response to male L. cylindrata venom. Male L. cylindrata venom (5-20 microg/ml) caused dose-dependent contractions in the epididymal segment of the rat vas deferens. The response to male L. cylindrata venom (10 microg/ml) was significantly inhibited by prazosin (0.3 microM) but was unaffected by depleting monoamine stores with reserpine. Male L. cylindrata venom (5-15 microg/ml) caused dose-dependent increases in rate and force of rat atria which were significantly inhibited by propranolol (5 microM) but not by reserpine. Female L. cylindrata venom (50 microg/ml) had no effect in atria. In the anaesthetised (pentobarbitone, 100 mg/kg, i.p.) rat, male L. cylindrata venom (10-300 microg/kg, i.v.) caused dose-dependent depressor responses while venom (up to 1 mg/kg, i.v.) from female L. cylindrata had no effect on arterial pressure. A histamine content of 5 and 0.01% (dry weight) was detected in venom from male and female L. cylindrata, respectively. Venom from male L. cylindrata was found to contain 56 pg noradrenaline/microg whereas venom from the female contained negligible noradrenaline. The results of this study show the presence of histamine and noradrenaline in venom from male L. cylindrata. Although devoid of significant quantities of these amines, female L. cylindrata venom has activity at adenosine receptors." @default.
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- W1997358556 date "2000-08-01" @default.
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- W1997358556 title "Sex differences in the pharmacological activity of venom from the white-tailed spider (Lampona cylindrata)" @default.
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- W1997358556 doi "https://doi.org/10.1016/s0041-0101(99)00226-3" @default.
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