changes in expression of platelet derived growth factor [PDGF] and PDGF receptor in rat corpus cavernosum after exposure to in vivo hypoxia and cigarette smoking

Platelet derived growth factor [PDGF] over activity has been implicated in atherosclerosis and several fibrotic conditions including lung and kidney fibrosis, liver cirrhosis and myelofibrosis. Low oxygen tension [hypoxia] and cigarette smoking is a known stimulus for transcriptional induction of [PDGF] ligand and receptor gene. We studied the expression of [PDGF-A] and [PDGFR-beta] in adult male rat isolated corpus cavernosum under hypoxic and cigarette smoking conditions being associated with induction of fibrosis which may lead to erectile dysfunction. Fifty adult male albino rats were used in this experiment. They were divided into 5 groups. Group I [n=10], served as control group. Group II [n=10] rats exposed to acute hypoxia. Group III [n=10] rats exposed to chronic hypoxia. Group IV [n=10] rats exposed to acute cigarette smoking. Group V [n=10] rats exposed to chronic cigarette smoking. In all groups at the end of each experiment corpora cavernosa of all rats were carefully dissected and freed from surrounding tunica albuginia then frozen in -80°C for subsequent reverse transcriptase polymerase chain reaction [RT-PCR]. In all groups of rats PDGF-A and PDGR-m RNA were measured. There was significant increase in PDGF-A mRNA and PDGF- beta receptor in acute hypoxic group, chronic hypoxic group, and chronic cigarette smoking groups of rats compared to control group. It was found that hypoxia, whether, acute or chronic have similar effect of increasing PDGF-A mRNA and PDGF-beta receptor as well as chronic cigarette smoking group of rats. This may lead to erectile dysfunction

Assessment of seminal plasma laminin in fertile and infertile men / 亚洲男科学杂志(英文版)

<p><b>AIM</b>To assess laminin levels in the seminal plasma of infertile and fertile men, and to analyze the correlation of laminin levels with sperm count, age, sperm motility and semen volume.</p><p><b>METHODS</b>One hundred and twenty-five recruited men were equally divided into five groups according to their sperm concentration and clinical examination: fertile normozoospermia, oligoasthenozoospermia, non-obstructive azoospermia (NOA), obstructive azoospermia (OA) and congenital bilateral absent vas deferens (CBAVD). The patients' medical history was investigated and patients underwent clinical examination, conventional semen analysis and estimation of seminal plasma laminin by radioimmunoassay.</p><p><b>RESULTS</b>Seminal plasma laminin levels of successive groups were: 2.82 +/- 0.62, 2.49 +/- 0.44, 1.77 +/- 0.56, 1.72 +/- 0.76, 1.35 +/- 0.63 U/mL, respectively. The fertile normozoospermic group showed the highest concentration compared to all infertile groups with significant differences compared to azoospermic groups (P<0.05). Testicular contribution was estimated to be approximately one-third of the seminal laminin. Seminal plasma laminin demonstrated significant correlation with sperm concentration (r = 0.460, P < 0.001) and nonsignificant correlation with age (r = 0.021, P = 0.940), sperm motility percentage (r = 0.142, P = 0.615) and semen volume (r = 0.035, P = 0.087).</p><p><b>CONCLUSION</b>Seminal plasma laminin is derived mostly from prostatic and testicular portions and minimally from the seminal vesicle and vas deferens. Estimating seminal laminin alone is not conclusive in diagnosing different cases of male infertility.</p>