Uterine Secretion Proteins as Extrinsic Factors in Preimplantation Development

Beier, Henning M.; Kühnel, Wolfgang; Petry, G.

doi:10.1016/b978-0-08-017571-3.50015-2

Cited by 15 publications

(8 citation statements)

References 11 publications

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“…We were able to advance this secretion with 20 and 50 IU chorion gonadotropins. The premature secretion of ^-glycoprotein can also be observed during a normal pregnancy with exogenous progesterone ele vation [7,8]. As Kirchner [personal information] demonstrated with HCG injections between 2 days 12 h and 4 days 12 h, /9-glycoprotein can also be prematurely secreted under the influence of exogenous gonadotropin during the pre-implantation phase.…”

Section: Histological and Biochemical Transformation O F The Pseudoprmentioning

confidence: 81%

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Pseudopregnancy in the Rabbit after Stimulation by Human Chorionic Gonadotropin

Beier

Kühnel²

1973

Horm Res

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The development of HCG-stimulated pseudopregnancy in the rabbit was studied with histological, electronmicroscopic and biochemical methods. This included the fate of the secretion unfertilized ova on the one hand and an analysis of the pseudopregnant endometrial secretion on the other. The unfertilized ova degenerate during pseudopregnancy, over half of these ova can be found in the uterus between the 4th and the 11th day after injection of HCG, the others are probably aborted. Endometrial secretion appears much sooner during the HCG-induced pseudopregnancy than in a normal pregnancy. The picture of maximal secretory capacity is maintained in the pseudopregnant cavum epithelium at least as long as in a normal pre-implantation pregnancy, i.e. up to the 7th day post coitum. The 11-day endometrium is no longer secretory active.During the secretory peak the pseudopregnant cavum epithelium exhibits a great number of apical protrusions, just as in normal pregnancy. With the electron microscope it was possible to demonstrate these protrusions as cell compartments rich in cytoplasm. The development of the pseudopregnant endometrial protein secretion is not identical with the normal one.The present results of differences between normal pregnancy and pseudopregnancy after stimulation with chorion gonadotropin provide further indications that the still unimplanted rabbit blastocyst must connect itself to the maternal regulating circuits before implantation. This is to adapt the intra-uterine environment to the growth and developmental requirements of the embryo and in order to synchronize the former with the embryonic system. The reactions of the external developmental factors do not proceed fully autonomously, but must to some extent be triggered off by the embryo itself.

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Section: Histological and Biochemical Transformation O F The Pseudoprmentioning

confidence: 81%

“…Histochemical analyses of the border of the apical cavum epithelium indicate [7,37,45,46] that mainly proteins and mucosubstances are con tained in the 'secreted' cell heads. Both the Hale reaction for mucosub stances ( fig.…”

Section: Histological and Biochemical Transformation O F The Pseudoprmentioning

confidence: 99%

Pseudopregnancy in the Rabbit after Stimulation by Human Chorionic Gonadotropin

Beier

Kühnel²

1973

Horm Res

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“…Diese Proteine sind unterschiedlicher Herkunft: Aus Gefäûen und dem Stroma kommen sie als Transsudate, aus apoptotischen und abgeschilferten Zellen werden sie freigesetzt und aus den endometrialen Drüsen als Sekretproteine ins Uteruslumen abgegeben (Beier et al 1971;Beier 1974; Sekretion in die Uterusflüssigkeit gelangt, treten in Abhängigkeit von der Steuerung durch die ovariellen Hormone zu unterschiedlichen Zeitpunkten und in unterschiedlichen Konzentrationen im Sekret auf (Abb. 6).…”

Section: Das Endometriale Sekretunclassified

Das Endometrium und sein „Implantationsfenster"

Beier-Hellwig

Alfer

Müller-Schöttle

et al. 2001

Reproduktionsmedizin

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“…14,15 In older mares, sclerosis of the intima and adventitia layers of blood vessels are evident. 17,18 Results of electron microscopy suggest vascular impairment may be associated with extensive fibrosis. 14,15 Thus, angiopathies may be related to the pathogenesis of endometriosis.…”

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confidence: 99%