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Effects of electroejaculation and ketamine-HCI on serum cortisol, progesterone, and testosterone in the male cat
stress adrenal anesthesia
2009/2/20
The influence of manual restraint, ketamine-hydrochloride anesthesia and electroejaculation under anesthesia on circulating levels of cortisol, progesterone and testosterone was examined in male d...
Nature of the Clearance of Exogenous Testosterone and Progesterone in Ejaculated Bovine Semen
progesterone testosterone blood semen ejaculated
2009/2/19
Plasma and semen concentrations of androgens and progestins were not influenced by repetitive ejaculation in bulls. Within 20 minutes after the injection of testosterone (100 mg Intravenously), plas...
Acrosome reaction in dog sperm is induced by a membrane-localized progesterone receptor
Canine spermatozoa prostatic fluid
2009/2/18
The aim of this study was to investigate whether the dog sperm acrosome reaction can be induced by progesterone and whether the action of progesterone is mediated by binding of progesterone to a r...
Bicarbonate-dependent lipid ordering and protein aggregation are part of the nongenomic action of progesterone on capacitated spermatozoa
Capacitation acrosome reaction membrane bicuculline
2009/2/18
The nongenomic action of progesterone (P) on capacitated sperm in mediating acrosomal exocytosis operates through transmembrane signal transduction involving increased intracellular calcium ions and...
Human sperm capacitation induced by biological fluids and progesterone, but not by NADH or NADPH, is associated with the production of superoxide anion
Spermatozoa MCLA reactive oxygen species sperm hyperactivation protein tyrosine
2009/2/17
Recent evidence indicated that human sperm capacitation is associated with an increased production of superoxide anion (O2.-). To further study the role and importance of O2.- in capacitation, we in...
Chloride efflux during the progesterone-initiated human sperm acrosome reaction is inhibited by lavendustin A, a tyrosine kinase inhibitor
GABAA receptor Cl- channel
2009/2/16
Previous studies showed that progesterone (P) can initiate the mammalian sperm acrosome reaction (AR) in vitro and that a sperm GABAA-like receptor/Cl- channel is involved in an essential Cl- effl...
Importance of bicarbonate to the progesterone-initiated human sperm acrosome reaction
Anion channel bicarbonate sperm acrosome reaction
2009/2/13
Progesterone, a putative in vivo initiator of the human sperm acrosome reaction (AR), has previously been shown to act at the sperm plasma membrane to initiate the AR in vitro. Here, we have investi...
Capacitation in vitro of stallion spermatozoa：comparison of progesterone-induced acrosome reactions in fertile and subfertile males
Equine male gamete infertility acrosomal
2009/2/13
Mammalian sperm that have completed capacitation are capable of undergoing the acrosome reaction in response to a number of biological and chemical stimuli. In the present report, we have investig...
Decreased responsiveness to progesterone of spermatozoa in oligozoospermic patients
Oligozoospermia progesterone sperm intracellular calcium concentration acrosome reaction capacitation
2009/2/11
Spermatozoa from oligozoospermic subjects are characterized by a reduced in vitro ability to penetrate hamster oocytes and by a decreased responsiveness to physiological stimuli that trigger the a...
Intracellular calcium accumulation and responsiveness to progesterone in capacitating human spermatozoa
Spermatozoa [Ca2+]i progesterone capacitation
2009/2/7
Progesterone induced a rapid, long-lasting, dose-dependent increase of intracellular free calcium concentration ([Ca2+]i) in human sperm capacitated overnight. This effect was not counteracted by th...
Progesterone-induced calcium influx in cynomolgus monkey（Macaca fascicularis）spermatozoa
Progesterone-induced calcium cynomolgus monkey spermatozoa
2008/12/25
For in vitro capacitation to occur in cynomolgus monkey (Macaca fascicularis) spermatozoa, there is an absolute requirement for exogenous stimulation with the sperm activators, caffeine (1 mM) and d...
Lack of Voltage-Dependent Calcium Channel Opening During the Calcium Influx Induced by Progesterone in Human Sperm. Effect of Calcium Channel Deactivation and Inactivation
Intracellular calcium mammalian sperm membrane potential membrane potential-sensitive dyes
2008/12/22
Progesterone induces calcium influx and acrosomal exocytosis in human sperm. Pharmacologic evidence suggests that voltage-dependent calcium channels (VDCCs) are involved. In this study, membrane p...
Progesterone Receptor Availability in Mouse Spermatozoa During Epididymal Transit and Capacitation：Ligand Blot Detection of Progesterone-Binding Protein
Acrosome reaction sperm maturation
2008/12/19
The goals of the present study were to determine the availability of progesterone (P4) receptor (P4r) in mouse sperm during maturation and capacitation and to make the first steps toward a character...
Progesterone Receptor Availability in Mouse Spermatozoa During Epididymal Transit and Capacitation：Ligand Blot Detection of Progesterone-Binding Protein
Acrosome reaction sperm maturation
2008/12/19
The goals of the present study were to determine the availability of progesterone (P4) receptor (P4r) in mouse sperm during maturation and capacitation and to make the first steps toward a character...