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Abstract:

The present studies were carried out to characterize the cAMP- phosphodiesterase enzyme (PDE) in luteal cells recovered from pseudopregnant rats with streptozotocin-induced diabetes. A significant increase in the specific activity of the enzyme was detected in luteal cells from diabetic rats (Group D) with respect to control rats (Group C). This increase could not be prevented by insulin therapy (Group I). Luteal cells from Groups C and D rats responded in vitro to insulin by increasing their PDE activity (% of stimulus of specific activity: C = 75%, D = 110%). However, in cells isolated from Group I, the hormone caused an inhibition of PDE activity (% of inhibition of specific activity: 48%). When cytosolic fractions from Groups C, D, and I were submitted to ion exchange chromatography, two PDE activity peaks could be observed and the activity of the different fractions was increased in the presence of Ca2+ and calmodulin. Nevertheless, the Ca2+ -calmodulin effect was much lower in the extracts from Groups D and I than for controls. Kinetic studies of luteal PDE showed nonlinear Lineweaver-Burk graphs with two apparent ATP hydrolysis sites. Similar K(m) values were found for PDE from groups C, D, and I, whereas the V(max2) for the enzyme was higher in Groups D and I. The endogenous concentration of cAMP, measured by RIA, showed no significant differences among Groups C, D, and I. On the basis of these results, we conclude that the specific activity of PDE is significantly increased in luteal cells from streptozotocin-induced diabetic animals, which could explain the previously described reduction in LH- stimulated progesterone production by luteal cells in diabetic rats.

Registro:

Documento: Artículo
Título:Effect of streptozotocin-induced diabetes on phosphodiesterase activity in rat luteal cells
Autor:Stein, P.; Téllez-Iñón, M.T.; Tesone, M.
Filiación:Inst. de Biol. y Med. Experimental, Universidad de Buenos Aires, Buenos Aires, Argentina
Inst. Invest. Ing. Genet. y Biol. M., CONICET, Universidad de Buenos Aires, Buenos Aires, Argentina
Fac. de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
Inst. de Biol. y Med. Experimental, Obligado 2490, (1428) Buenos Aires, Argentina
Palabras clave:cAMP; Corpus luteum; Diabetes; Insulin; Ovary; Phosphodiesterase; phosphodiesterase; animal cell; article; corpus luteum; enzyme activity; female; female infertility; insulin dependent diabetes mellitus; luteal cell; nonhuman; priority journal; progesterone synthesis; rat; 3',5'-Cyclic-Nucleotide Phosphodiesterase; Animals; Calmodulin; Cell Fractionation; Chromatography, Ion Exchange; Diabetes Mellitus, Experimental; Female; Kinetics; Ovary; Pseudopregnancy; Rats; Rats, Sprague-Dawley; Superovulation; Animalia
Año:1996
Volumen:45
Número:1
Página de inicio:43
Página de fin:47
DOI: http://dx.doi.org/10.1002/(SICI)1098-2795(199609)45:1<43::AID-MRD6>3.0.CO;2-S
Título revista:Molecular Reproduction and Development
Título revista abreviado:MOL. REPROD. DEV.
ISSN:1040452X
CODEN:MREDE
CAS:3',5'-Cyclic-Nucleotide Phosphodiesterase, EC 3.1.4.17; Calmodulin
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_1040452X_v45_n1_p43_Stein

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Citas:

---------- APA ----------
Stein, P., Téllez-Iñón, M.T. & Tesone, M. (1996) . Effect of streptozotocin-induced diabetes on phosphodiesterase activity in rat luteal cells. Molecular Reproduction and Development, 45(1), 43-47.
http://dx.doi.org/10.1002/(SICI)1098-2795(199609)45:1<43::AID-MRD6>3.0.CO;2-S
---------- CHICAGO ----------
Stein, P., Téllez-Iñón, M.T., Tesone, M. "Effect of streptozotocin-induced diabetes on phosphodiesterase activity in rat luteal cells" . Molecular Reproduction and Development 45, no. 1 (1996) : 43-47.
http://dx.doi.org/10.1002/(SICI)1098-2795(199609)45:1<43::AID-MRD6>3.0.CO;2-S
---------- MLA ----------
Stein, P., Téllez-Iñón, M.T., Tesone, M. "Effect of streptozotocin-induced diabetes on phosphodiesterase activity in rat luteal cells" . Molecular Reproduction and Development, vol. 45, no. 1, 1996, pp. 43-47.
http://dx.doi.org/10.1002/(SICI)1098-2795(199609)45:1<43::AID-MRD6>3.0.CO;2-S
---------- VANCOUVER ----------
Stein, P., Téllez-Iñón, M.T., Tesone, M. Effect of streptozotocin-induced diabetes on phosphodiesterase activity in rat luteal cells. MOL. REPROD. DEV. 1996;45(1):43-47.
http://dx.doi.org/10.1002/(SICI)1098-2795(199609)45:1<43::AID-MRD6>3.0.CO;2-S