172
edits
Changes
Parturition Endocrine Control - Anatomy & Physiology (view source)
Revision as of 10:03, 17 August 2009
, 10:03, 17 August 2009→Regulation of Prostaglandins
The [[Female_Reproductive_Tract_-The_Uterus|uterus]] is an important site of prostaglandin synthesis. During pregnancy, the presence of the foetus inhibits the production of prostaglandins in order to prevent luteolysis. At parturition, an increase in prostaglandin synthesis is required.
The [[Female_Reproductive_Tract_-The_Uterus|uterus]] is an important site of prostaglandin synthesis. During pregnancy, the presence of the foetus inhibits the production of prostaglandins in order to prevent luteolysis. At parturition, an increase in prostaglandin synthesis is required.
* Prostaglandins are synthesized from '''Arachadonic Acid''', which is derived from '''Glycerophospholipids''' by the enzyme '''Phospholipase A2''' (PLA2).
* Prostaglandins are synthesized from '''arachadonic Acid''', which is derived from '''glycerophospholipids''' by the enzyme '''phospholipase A2''' (PLA2).
** '''Oestrogen''' liberates Phospholipase A2 from lysosomes.
** '''Oestrogen''' liberates phospholipase A2 from lysosomes.
** '''Progesterone''' stabilises lysosomes, so Phospholipase A2 cannot be liberated from lysosomes.
** '''Progesterone''' stabilises lysosomes, so phospholipase A2 cannot be liberated from lysosomes.
* An increase in '''Oestrogen:Progesterone ratio''' increases prostaglandin production.
* An increase in '''oestrogen:progesterone ratio''' increases prostaglandin production.
* The increase in '''Oestradiol''' (bioactive oestrogen) also increases expression of '''endometrial Oxytocin receptors'''.
* The increase in '''oestradiol''' (bioactive oestrogen) also increases expression of '''endometrial oxytocin receptors'''.
== Regulation of Oxytocin ==
== Regulation of Oxytocin ==