7112 13 archive 73 disk0/00/00/71/12 2008-07-25 03:34:04 2008-07-25 03:34:04 2008-07-25 03:34:04 article show S.M.Jones@utas.edu.au Bennett EJ Jones SM S.M.Jones@utas.edu.au pub 060604 970106 restricted Adrenal; Corpus luteum; Gestation; Ovary; Placenta; Progesterone; Skink; Steroid; Viviparity The definitive version is available at http://www.sciencedirect.com la 22/7 2002 Plasma progesterone concentrations were measured at six stages of gestation in the viviparous lizard Niveoscincus metallicus. Anatomical and functional parameters of luteal activity were also investigated. The diameter of the corpus luteum (CL) decreased gradually though gestation, as did the diameter of the luteal cells. Major degenerative changes were observed in CLs post-partum. Plasma progesterone concentrations were basal both prior to, and just after, ovulation; a rapid increase occurred in early gestation. Plasma progesterone concentrations remained elevated until late gestation, but fell some 2 weeks before parturition. In vitro production of progesterone was greater in CLs in mid-than in lategestation, and the addition of prostaglandin F2a to the incubation medium had no effect on progesterone production. Non-luteal ovarian tissue and adrenals produced progesterone, but at approximately one-tenth the rate of production by CLs. Temporal correlations between the plasma progesterone profile and stages of placental development were also assessed. The rise in plasma progesterone concentrations occurs before differentiation of the chorioallantoic placenta, but progesterone is still high when it degenerates. We conclude that the CLs are the major source of gestational progesterone in N. metallicus. 2002 published Comparative Biochemistry and Physiology Part A 131 647-656 10.1016/S1095-6433(01)00495-0 TRUE 1095-6433/02/$ http://dx.doi.org/10.1016/S1095-6433(01)00495-0 Andrews, R.M., Mathies, T., 2000. Natural history of reptilian development: constraints on the evolution of viviparity. Bioscience 50, 227–238. Angelini, F., Ghiara, G., 1991. Viviparity in squamates.. In: Ghiara, G.et al., (Ed.), Symposium on the Evolution of Terrestrial Vertebrates. Selected Symposia and Monographs U.Z.I., 4. Mucchi, Modena, pp. 305–334. Bonnet, X., Naulleau, G., Bradshaw, D., Shine, R., 2001. Changes in plasma progesterone in relation to vitellogenesis and gestation in the viviparous snake Vipera aspis. Gen. Comp. Endocrinol. 121, 84–94. Bourne, A.R., Stewart, B.J., Watson, T., 1986. Changes in blood progesterone concentration during pregnancy in the lizard Tilliqua (Trachydosaurus) rugosa. Comp. Biochem. 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A review of placentation among reptiles with particular regard to the function and evolution of the placenta. Proc. Zool. Soc. Lond. 3, 625–645. Xavier, F., 1982. Progesterone in the viviparous lizard Lacerta vivipara: ovarian biosynthesis. plasma levels, and binding to transcortin-type protein during the sexual cycle. Herpetologica 38, 62–70. Xavier, F., 1987. Functional morphology and regulation of the corpus luteum.. In: Norris, D.O., Jones, R.E. (Eds.), Hormones and Reproduction in Fishes, Amphibians and Reptiles. Plenum Press, New York, pp. 241–282. 5910 3 7112 1 application/pdf en staffonly cc_utas

Bennett_&_Jones_2002_Comp_Biochem_&_Phys_A.pdf

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