Participation of Pregnant Uterus upon the Gestagen Secretion during Midpregnancy in the Rat
スポンサーリンク
概要
- 論文の詳細を見る
As a general secretion pattern of gestagen during the functional luteal phase inthe rat, the level of progesterone is always high and that of 20α-hydroxypregn-4-en-3-one (20α-OHP) is low. Thus, the reciprocal relationship is generally observed between two steroids. In the midpregnancy corresponding to the time of placentation, however, the characteristic pattern of gestagen secretion was observed as an exception, i. e. in parallel with progesterone, the level of 20α-OHP also rises.<BR>Hypophysectomy performed at 12 day of pregnancy, did not alter this characteristic secretory pattern. The luteotrophic factor which resulted in parallel rise of progesterone and 20α-OHP at this stage, therefore, was not seem to be the pituitary origin. Hysterectomy in addition to hypophysectomy, caused significant decrease of both steroids and nullified the parallel rise. The luteotrophic factor seemed to be secreted from pregnant uteri. Pregnant uteri from which fetuses alone were removed, however, could not produce the parallel rising of two steroids, though the secretion was continued in some extent and showed almost the same level with that of pseudopregnant rats bearing deciduomata.<BR>The fetuses are considered to be essential to form the endocrine milieu which bring about the characteristic pattern of gestagen secretion at midpregnancy, and this luteotrophic factor might be produced and secreted as the results of an interaction between placentae and fetuses.
- 社団法人 日本内分泌学会の論文
著者
-
SUZUKI YOSHISUKE
Department of Veterinary Physiology, Faculty of Agriculture, University of Tokyo
-
SIN JUNG-GYUN
Department of Veterinary Physiology, Faculty of Agriculture, University of Tokyo
-
ETO TEIICHI
Department of Veterinary Physiology, Faculty of Agriculture, University of Tokyo
-
HASHIMOTO INORU
Department of Veterinary Physiology, Faculty of Agriculture, University of Tokyo
-
SUZUKI YOSHISUKE
Department of Veterinary Physiology, Faculty of Agriculture University of Tokyo
関連論文
- Stimulatory Action of Ovine LH Releasing Factor on Synthesis of Luteinizing Hormone (LH) Demonstrated by the Rat Intratesticular Test System
- Rat Intratesticular Test Systems for Investigating Luteinizing Hormone Releasing Factor (LRF) and Luteinizing Hormone (LH) Activities : Activities: Effects of Rat Stalk-Median Eminence Extract and Internal Environment of Rat Testis upon Rat and Quail Ante
- Testicular Function of Actively Immunized Male Rats with LH Releasing Hormone (LHRH): A Possible Role of Prolactin on Regulation of Spermatogenesis
- Intratesticular Tissue Fluid (ITF) for the Micro-Bioassay of LH
- AN OVARIAN ASCORBIC ACID DEPLETION METHOD FOR LH ASSAY USING LOCAL APPLICATION (INTRA-BURSAL) IN PSEUDOPREGNANT ADULT RATS
- The Dependency of the Rat Estrous Cycle on the Daily Alternation of Light and Dark
- The Effect of the Uterine Cervical Stimulation at Postpartum Estrus upon the Post-weaning Fate of the Lactational Corpora Lutea
- The Rat Estrous Cycle Associated with Functional Corpora Lutea and the Mechanism of Its Recurrence
- Androgen Distribution in Male Rats
- Conditions for Establishment of Reflex Ovulation in Light Estrous Rats
- On Circulating Sex Steroids During the Estrous Cycle and the Early Pseudopregnancy in the Rat with Special Reference to its Luteal Activation
- Resumption of Cyclicity in Light Induced Persistent Estrus by Treatments with Serotonin or its Precursor
- Participation of Pregnant Uterus upon the Gestagen Secretion during Midpregnancy in the Rat
- Light Activation of Gonadal Function Restrained by Continuous Dark Treatment in Male Rats
- Blockade of Ovulation in Rats by Forced Immobilization for Surgical Treatment
- LH Synthesizing Activity of Synthetic LH Releasing Hormone Assessed by Rat Pituitary Implanting System of Rat Intratesticular Test