Factors which influence sperm ability to fertilize.
ABSTRACT Different factors influence animal sperm ability to fertilize. Some of them are reviewed here, sperm motility, block to polyspermy, chemioattraction, sperm competition for fertilization. Old and new data are reported, as for example the new notions on sperm motility derived from site directed mutagenesis in rodents, the new notions on the odour receptors in mammalian sperm attraction and new notions on sperm competition, which is variable in different species.
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ABSTRACT: Seminal plasma, an amorphous material that exists in semen, contains proteins related to sperm forward motility. Employing affinity chromatography with ConA beads and protein ultrafiltration, we isolated and concentrated proteins from heated human seminal plasma. Results of computer-assisted semen analyses (CASA) demonstrated that the forward motility index of bovine spermatozoa from the epididymal caput, incubated with proteins and theophylline, was significantly different from that of spermatozoa incubated with theophylline alone (P < 0.01). The electrophoreses revealed that the protein bands with high molecular weights in the gel of PAGE changed into low molecular weights in the gel of SDS-PAGE. Furthermore, proteins from a separated portion of the PAGE gel were still able to stimulate spermatozoa from the epididymal caput to gain forward motility. Two-dimensional (2D)-gel electrophoresis and mass spectrometry indicated that spots focused on the portion seemed, according to their amino acid sequences, to be like human alpha-1-antitrypsin and zinc-alpha-2-glycoprotein (ZAG) precursors. Western blot analysis showed the presence of these two proteins in seminal plasma. These proteins, related to the forward motility of spermatozoa in human seminal plasma, may play important roles during maturation of spermatozoa, from the epididymis through fertilization in the female reproductive tract.Molecular Reproduction and Development 10/2007; 74(9):1124-31. · 2.81 Impact Factor
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ABSTRACT: Spermatozoa are basic male reproductive cells. An analysis of semen characteristics can provide a reasonable basis upon which to develop a strategy for maximizing the fertility. Because it is generally accepted that a high percentage of poorly motile or immotile sperm will adversely affect male fertility, analysis of sperm motility is a central part of the evaluation of male fertility. To study the motility pattern of small particles is difficult. A new development in medical imaging technology can now be applied for this purpose. Here, the author used a new medical imaging technology to predict the motility pattern of sperm. According to this study, it can be seen that the motility of each sperm is horizontal but the motility of all sperms seems to be directionless. In addition, an interesting observation is that there is a whirling type of sperm motility in case of erroneous motion.Sexuality and Disability 08/2007; 25(3):151-154. · 0.72 Impact Factor