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Uterine motility in the reptile Anolis c ... landins, calcium, and vasotocin
Uterine motility in the reptile Anolis carolinensis interactive effects of tension, prostaglandins, calcium, and vasotocin
5383
Uteri of Anolis carolinensis exhibited spontaneous rhythmic contractions in vitro. Addition of arginine vasotocin (AVT) caused an immediate, strong, tonic contraction followed by rhythmic contractions with the same frequency as spontaneous contractions but of a greater amplitude. At low tension (1.5 g) the AVT-induced tonic contraction was blocked by low dose of indomethacin, suggesting that it is influenced by calcium rather than prostaglandins (PGs). An increase in tension (from 1.5 to 15 g) reduced the duration of the AVT-induced tonic contraction; this stretch-induced decrease was also blocked by indomethacin. Stretch also decreased the duration of the rhythmic contractions, but this stretch effect was not inhibited by indomethacin. The rest interval between rhythmic contractions was decreased by PGF2alpha and PGE2, and indomethacin or stretch blocked these PG effects. Indomethacin, AVT, or stretch alone did not affect PGF2alpha secretion from AVT-treated uteri. Stretch also reduced PGF2alpha secretion from AVT-treated uteri, an effect inhibited by indomethacin.
Jones RE, Lopez KH, Austin HB, Orlicky DJ, Summers CH
Journal of experimental zoology. Part A, Comparative experimental biology
2006-12-01 00:00
305
12
1030-40
Animals,Calcium,Female,Indomethacin,Lizards,Muscle Tonus,Prostaglandins,Reflex, Stretch,Uterine Contraction,Vasotocin,Prostaglandins,Indomethacin,Calcium,Vasotocin
Laboratory of Comparative Reproduction, Department of Integrative Physiology, University of Colorado, Boulder, Colorado 80309, USA.
J. Exp. Zoolog. Part A Comp. Exp. Biol.
NICHD 2-R01-HD14000-05, NCRR P20 RR15567
1548-8969
10.1002/jez.a.351
0
False
17041917
