Spermatic characteristics were studied in 10 species representing several distinct groups within the catfish family Doradidae. Interestingly, different types of spermatogenesis, spermiogenesis and spermatozoa are correlated with intrafamilial groups previously proposed for Doradidae. Semi-cystic spermatogenesis, modified Type III spermiogenesis, and biflagellate sperm appear to be unique within...

in this review, we aim to examine the effect of extrinsic and intrinsic factors on spermatogenesis process taking into account a complex signaling pathway. primarily, it is suggested that retinoic acid (ra) has a vital function in spermatogenesis process and it is considered to be essential for completion of spermatogonia into mature spermatozoa. in the present review, the key effects of retino...

Spermatogenesis and sperm maturation are complex processes which are affected by a myriad of endocrine, paracrine and neural factors. In birds, regulation of testicular and excurrent duct growth, maturation and function are only poorly understood. As the quality and quantity of sperm produced may be altered at any of several points during sexual maturation, spermatogenesis or during extragonada...

Previous studies have shown that treatment of rats with gonadotropin-releasing hormone (GnRH) analogues or steroids either before exposure to procarbazine or radiation or after irradiation enhances subsequent levels of spermatogenesis. We demonstrate here that giving a GnRH agonist after procarbazine injection also enhances spermatogenesis and fertility. We also demonstrate that GnRH agonist st...

The physiological function of spermatogenesis in Caenorhabditis elegans, Drosophila melanogaster and mammals is to produce spermatozoa (1n, haploid) that contain only half of the genetic material of spermatogonia (2n, diploid). This half number of chromosomes from a spermatozoon will then be reconstituted to become a diploid cell upon fertilization with an egg, which is also haploid. Thus, gene...

dear editor in recent years, the number of scientific research papers of iranian scientists has substantially grown in national and international journals that indicates particular attitude of iranian scientific community to the development of knowledge in different fields. moreover, improvement of quality of scientific papers is necessary. for this purpose, criticism of published studies is a ...

Blood testis barrier (BTB) is one of the tightest blood-barriers controlling the entry of substances into the intratubular fluid. Diabetes Mellitus (DM) is an epidemic metabolic disease concurrent with falling fertility rates, which provokes severe detrimental BTB alterations. It induces testicular alterations, disrupting the metabolic cooperation between the cellular constituents of BTB, with ...

infertility is a relatively common problem among couples, and gossypol, a yellowishpigment detected in cottonseed, is one cause.adult nmri mice (25-35 gr) were used in this study. the animals were kept in standard conditionswith a dark and light cycle of 12:12, controlled humidity and temperature, food and water were availableadlibitium.gossypol was dissolved in ethanol and diluted by sunflower...

conclusions it seems that the preventive effects of rutin against damages caused by ida can be attributed to its ability to reduce apoptosis, which may be mediated by underexpression of caspase3 and overexpression of bcl2 genes. also, it could increase the expression of dazl that may be important in spermatogenesis. methods in the current experimental study, balb/c mice were divided into 8 grou...

conclusions the results of the present study indicate the protective effects of melissa officinalis on some sperm parameters and spermatogenesis quality in rats exposed to lead. background some medicinal plants with their antioxidant properties have protective effects on sperm parameters and neutralize the harmful effects of lead exposure. objectives the present study aimed to determine the eff...