NDLI: Timing of parturition in two species of viviparous lizard: influences of β-adrenergic stimulation and temperature upon uterine responses to arginine vasotocin (AVT)

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Timing of parturition in two species of viviparous lizard: influences of β-adrenergic stimulation and temperature upon uterine responses to arginine vasotocin (AVT)

Content Provider	Springer Nature Link
Author	Atkins, Natalia Jones, Susan M. Guillette, Louis J.
Copyright Year	2006
Abstract	The southern snow skink Niveoscincus microlepidotus is a viviparous alpine lizard with biennial reproduction, in which embryos are fully developed before winter but parturition is delayed until spring. We aimed to determine whether, in this species, in vitro uterine preparations are responsive to arginine vasotocin (AVT) and prostaglandin (PGF2α) in autumn and spring, and whether pre-treatment with the β-adrenergic agonist isoproterenol decreases the effectiveness of AVT in stimulating uterine contractions. Using the spotted snow skink (Niveoscincus ocellatus), an annually breeding species, we aimed to determine influences of temperature and the β-adrenergic system upon the response to AVT in vivo. In both N. microlepidotus and N. ocellatus females are more responsive to AVT than to PGF2α, and that the response to AVT is decreased, but not prevented, by β-adrenergic stimulation. In N. microlepidotus, uteri are equally responsive in both seasons to the hormones administered. In N. ocellatus environmental conditions, specifically, temperature, modulate the response to AVT in vivo with the time to parturition increasing as temperature decreases. We conclude that in these viviparous squamates the endocrine cascade leading to parturition is modulated by the β-adrenergic system, and that this may reflect the mechanism by which the timing of parturition is tied to suitable environmental conditions.
Starting Page	783
Ending Page	792
Page Count	10
File Format	PDF
ISSN	01741578
Journal	Journal of Comparative Physiology B
Volume Number	176
Issue Number	8
e-ISSN	1432136X
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-07-11
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Birth Environment Niveoscincus Oviduct Prostaglandin F2α Animal Physiology Zoology Human Physiology Biomedicine general Biochemistry
Content Type	Text
Resource Type	Article
Subject	Physiology Biochemistry Animal Science and Zoology Ecology, Evolution, Behavior and Systematics Endocrinology

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Timing of parturition in two species of viviparous lizard: influences of β-adrenergic stimulation and temperature upon uterine responses to arginine vasotocin (AVT)