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The changing profiles of L-ornithine decarboxylase and S-adenosyl-L-methionine decarboxylase activities in testicular cell types during sexual maturation of male rats
L-ornithine decarboxylase S-adenosyl-L-methionine testicular cell types
2009/2/23
To understand the involvement of polyamines in testicular maturation and spermatogenesis, the activity of two enzymes involved in the polyamine synthetic pathway, L-ornithine decarboxylase (ODC) a...
Polyamine profiles in rat testis, germ cells and Sertoli cells during testicular maturation
Polyamine profiles rat testis germ cells Sertoli cells
2009/2/23
Polyamine cellular concentrations (putrescine, spermidine and spermine) in the rat testis and testicular cell types were determined by fluorescence spectroscopy of their dansyl derivatives. A met...
Influence of photoperiod, ambient temperature and melatonin on testosterone synthesis and release during reproductive maturation in male deer mice
photoperiod ambient temperature melatonin testosterone synthesis reproductive maturation male deer mice
2009/2/23
Four experiments were designed to investigate the influence of photoperiod and other environmental factors on androgen production and reproductive maturation in deer mice. Male prairie deer mice (Pe...
Modification of the rat sperm flagellar plasma membrane during maturation in the epididymis
Modification rat sperm flagellar plasma membrane maturation epididymis
2009/2/23
Previously, we demonstrated that surface radiolabeling of rat epididymal spermatozoa by lactoperoxidase-catalyzed iodination reveals a major component with an apparent molecular weight of 26,000 to ...
Sexual maturation in underfed weight-matched rats. A test of the“critical body weight”theory of pubertal timing in males
Sexual maturation underfed weight-matched rats critical body weight
2009/2/23
A popular current theory proposes that the timing of puberty is related to attainment of a critical level of body weight or body fatness. These critical body weight and critical body fat theories ha...
Concentrations of free testosterone, total testosterone, and androgen binding protein in the peripheral serum of male rats during sexual maturation
free testosterone total testosterone androgen binding protein peripheral serum male rats
2009/2/23
To investigate the relationship between free testosterone and sexual maturation in the male rat, animals were decapitated every 5 days from 25 through 75 days of life. Serum was assayed for androgen...
Effects of induced hypoprolactinemia on testicular function during gonadal maturation in the rat
testes androgens bromocriptine prolactin
2009/2/20
We have evaluated the effects of hypoprolactinemia during gonadal maturation in the male rat. Intact 30-day-old rats were injected daily for 10 days with three different doses of bromocriptine (0.75...
Round spermatids show normal testis-specific H1t but reduced cAMP-responsive element modulator and transition protein 1 expression in men with round-spermatid maturation arrest
ene expression human testis spermatogenic impairme
2009/2/18
During spermiogenesis, histones are replaced by transition proteins, which in turn are replaced by protamines. The TNP1 gene-encoding TP1 (transition protein 1) protein contains a cAMP-responsive el...
Temporal relation between leptin and various indices of sexual maturation in the male rat
Puberty adipose tissue testosterone gonadotropins
2009/2/18
Recent studies in humans and rhesus monkeys have suggested the possibility that the adipose tissue hormone leptin has a stimulatory and/or permissive effect on the onset of puberty in the male. We...
Deficiency of fucosidase results in acrosomal dysgenesis and impaired sperm maturation
Fucosidosis spermatogenesis epididymis dog
2009/2/17
Although a variety of glycosyltransferases and glycosidases have been implicated in spermatogenesis and posttesticular sperm maturation, the biological role of these enzymes in these processes is larg...
Transforming growth factor-beta1（TGF-beta1）in penile and prostate growth in the rat during sexual maturation
Penis androgen receptors
2009/2/17
The goal of this study was to determine whether transforming growth factor-beta1 (TGF-beta1) may contribute to the arrest of penile growth and the down-regulation of androgen receptors (AR) that occ...
The impact of reactive oxygen species on bovine sperm fertilizing ability and oocyte maturation
Spermatozoa fertilization development xanthine oxidase
2009/2/17
The objective of this study was to examine the effects of reactive oxygen species (ROS) on bovine sperm function and on the developmental competence of in vitro-matured bovine oocytes. In a first se...
Maturation of monkey spermatozoa in the epididymis with respect to their ability to undergo the acrosome reaction
Capacitation primate development epididymis macaque
2009/2/16
Spermatozoa obtained along the length of the epididymides from five macaque monkeys (Macaca fascicularis) were examined for their ability to undergo the acrosome reaction under basal conditions and ...
Temporal appearance of antisperm antibodies during sexual maturation of rats after obstruction of the vas deferens
Autoantibodies spermatozoa vas deferens sparmatic
2009/2/13
The appearance of serum antisperm antibodies was studied during the maturation of rats in which the vas deferens was obstructed prepubertally. Vasa deferentia were ligated and divided bilaterally in...
Biochemical alterations in the proacrosin-acrosin system during epididymal maturation of the rat spermatozoa
Biochemical alterations proacrosin-acrosin system epididymal maturation rat spermatozoa
2009/2/10
Acrosin, an acrosomal serine protease, is believed to have a role in fertilization. The enzyme is synthesized in an enzymatically inactive precursor form, proacrosin, and is processed to enzymatical...