Testicular biohistochemical alterations following experimental varicocele in rats

The exact pathophysiology of testicular degeneration, following varicocele has not been completely understood yet. The current study was designed to determine the effect of varicocele on germinal epithelium [GE] cytoplasmic biohistochmical alterations. To follow-up this study, left varicocele was induced in test groups. Non-varicocelized rats were served as control-sham [n=6]. Following 4, 6 and 8 months, right and left testes were dissected out and the blood serum sample was taken. The GE cytoplasmic carbohydrate, lipid accumulation, lipase and alkaline-phosphates [ALP] ratios were analyzed. Serum levels of LH, FSH and testosterone were measured. Observations demonstrated that in varicocele-induced rats, the spermatogenesis cell lineage exhibited lower number of cells with periodic acid shift positive cytoplasm, higher number of cells with lipid and ALP positive stained cytoplasm in comparison to control animals. Lipase enzyme decreased by the time in the test animals. In varicocelized groups the number of Leydig cells decreased in to 2.25 +/- 0.41 and 1.16 +/- 0.75 per one mm[2] in left and right testicles respectively after 8 months, and these cells demonstrated an ALP positive feature. In test groups, the serum levels of LH and FSH reduced into 1.12 +/- 0.01 and 2.03 +/- 0.05 ng/ml respectively after 8 months. Although testosterone level diminished by the time in the test animals, and this decreasing was significant [p=0.031] after 8 months [3.08 +/- 0.10 ng/ml]. Our results suggest that following varicocele induction major alterations occur in GE, which may lead to loss of GE cells physiological function and ultimately result in fertility problems

Varicocele time-dependently affects DNA integrity of sperm cells: evidence for lower in vitro fertilization rate in varicocele-positive rats

We designed this study to clarify how varicocele can time-dependently affect sperm morphological parameters and DNA integrity. In this study, we intend to estimate the effect of various periods of varicocele on the in vitro fertilization [IVF] rate in rats. In this experimental study, left varicocele were induced as the test group [n=18] which was further sub-divided into three groups based on the study termination time [4, 6 and 8 months after varicocele induction]. The control-sham group [n=6] consisted of rats who received no treatment. Repopulation index [RI], tubular differentiation index [TDI], sperm viability and motility, morphological maturity, chromatin integrity and ability to undergo IVF were assessed. In addition, the potential impact of varicocele on serum total antioxidant capacity [TAOC] and total thiol molecules [TTM] were examined. Histological results showed that varicocele negatively influenced TDI and RI. All sperm morphological parameters were lower than those in the control-sham group. DNA damage was severely and time-dependently substantiated in all test groups. Varicocele significantly reduced the ability of sperm derived from varicocele rats to undergo IVF. Serum TAOC and TTM levels reduced in a time-dependent manner. Right testes varicocele-induced rats showed remarkably less damaged profile for all investigated parameters compared to the left testes varicocele. Our data suggested that experimentally induced varicocele negatively impacted sperm maturation and chromatin integrity in a time-dependent manner. This consequently caused a remarkable reduction in IVF ability. The detrimental effect of varicocele may be attributed to the significant reduction of antioxidant capacity of the serum

effect of tamoxifen on the fetal and neonatal ovarian follicles development in rats

The effect of tamoxifen as a selective estrogen receptor modulator which is widely used for treatment of early and metastatic breast cancer was investigated on the folliculogenesis in rat's fetuses and neonates. The pregnant rats assigned into test and control groups. Control group received olive oil and treatment groups received either 17-[3-estradiol [10 [micro g/kg/day] or tamoxifen [0.4 mg/kg/day] between days 8-13 of pregnancy. On day 20th of pregnancy the rats euthanized and the blood samples were collected for determination of FSH, E[2], and the fetuses fixed for histological studies. Another group of pregnant rats went forward to obtain their neonates and we euthanized the neonates and the genital system was collected for further histopathological analyses on day 5th. The histological examinations of the fetus's and neonate's ovaries and biochemical data showed significant changes in the rats which treated with tamoxifen. The absence of folliculogenesis and an increase in E[2] level in tamoxifen-treated group which accompanied with sharp decrease of FSH level in comparison with the control group were demonstrated. By contrary, E[2] treated group showed a positive progress in development in terms of the formation of secondary follicles and also supportive connective tissues in comparison with the control group. In conclusion, this study supports the previous findings showing that tamoxifen has effects on the development of ovaries and therefore, it should be avoided or used with great caution in pregnant women