Experimental anatomic modeling of venous dyshemocirculation in the scrotal organs. Bull Exp Biol Med. 2007;143:762-766. [PMID: 18239822 DOI: 10.1007/s10517-007-0235-3]

Aberrant Upregulation of Compensatory Redox Molecular Machines May Contribute to Sperm Dysfunction in Infertile Men with Unilateral Varicocele: A Proteomic Insight

Aims: To understand the molecular pathways involved in oxidative stress (OS)-mediated sperm dysfunction against a hypoxic and hyperthermic microenvironment backdrop of varicocele through a proteomic approach. Results: Protein selection (261) based on their role in redox homeostasis and/or oxidative/hyperthermic/hypoxic stress response from the sperm proteome data set of unilateral varicocele (UV) in comparison with fertile control displayed 85 to be differentially expressed. Upregulation of cellular oxidant detoxification and glutathione and reduced nicotinamide adenine dinucleotide (NADH) metabolism accompanied with downregulation of protein folding, energy metabolism, and heat stress responses were observed in the UV group. Ingenuity pathway analysis (IPA) predicted suppression of oxidative phosphorylation (OXPHOS) (validated by Western blotting [WB]) along with augmentation in OS and mitochondrial dysfunction in UV. The top affected networks indicated by IPA involved heat shock proteins (HSPs: HSPA2 and HSP90B1). Their expression profile was corroborated by immunocytochemistry and WB. Hypoxia-inducible factor 1A as an upstream regulator of HSPs was predicted by MetaCore. Occurrence of reductive stress in UV spermatozoa was corroborated by thiol redox status. Innovation: This is the first evidence of a novel pathway showing aberrant redox homeostasis against chronic hypoxic insult in varicocele leading to sperm dysfunction. Conclusions: Upregulation of antioxidant system and dysfunctional OXPHOS would have shifted the redox balance of biological redox couples (GSH/GSSG, NAD⁺/NADH, and NADP⁺/NADPH) to a more reducing state leading to reductive stress. Chronic reductive stress-induced OS may be involved in sperm dysfunction in infertile men with UV, where the role of HSPs cannot be ignored. Intervention with antioxidant therapy warrants proper prior investigation.

Histological findings in equine testes one year after standing laparoscopic peritoneal flap hernioplasty

In order to know reproduction-related complications due to standing laparoscopic peritoneal flap hernioplasty, histological characteristics of the testicles from five stallions one year after surgery were compared with seven testicles from four healthy stallions. Moreover, the daily sperm output (DSO) was determined before (T0) and one year after surgery (T12). DSO did not show significant differences between T0 and T12. The diameter of the seminiferous tubules was significantly decreased in the samples from the hernioplasty group. The percentage of tubules with full spermatogenesis was smaller in the hernioplasty group, but the difference was not significant. It can be concluded that standing laparoscopic peritoneal flap hernioplasty produced mild histological changes in the testicular parenchyma, epididymis and pampiniform plexus after one year follow-up.

Modulation of Thrombosis Significantly Reduces Testicular Damage after Testicular Torsion in Rats: Anti-Thrombotic Treatment and Testicular Torsion

OBJECTIVE

To evaluate the effects of thrombolysis and/or anticoagulation on testicular viability after testicular tortion (TT) was the aim of this study. It has been suggested that alterations of circulation during TT result in thrombus formation that might prevent sufficient perfusion after detorsion. Due to the narrow safety margin of testicular perfusion, even moderate disturbances in blood supply can cause major testicular damage.

METHODS

In 112 rats, the right testicle was torsed for 3 or 6 hours. After detorsion and randomization, they received either enoxaparin, alteplase, both, or placebo, according to their subgroup. Thrombus formation was accessed via D-dimers, pDNA, oxidative testicular damage was evaluated via glutathione peroxidase and malondialdehyde, and cellular damage via inhibin B, testosterone, histological analysis (Johnsen score, Cosetino grading), and TUNEL assay.

RESULTS

One hundred and twelve rats were included in the study. The treatment with alteplase or enoxaparin showed significantly less testicular damage and significantly improved Sertoli cell function. Enoxaparin significantly reduced oxidative impairment.

CONCLUSION

The results of the study indicate that TT induces thrombus formation and demonstrate that modulation of thrombosis significantly ameliorates testicular damage in rats. Hence, this treatment option after TT ought to be evaluated in humans.

Varicocele and infertility: Role of pressure flow dynamics

Varicocele is prevalent in infertile individuals as well as in normal adolescents and adults. It has an increasing trend with growing age. Infertile individuals with varicocele, develop varying degrees of sperm abnormalities that range from mild to severe semen abnormalities, even azoospermia may develop. The main proposed features of these abnormalities are incompetence of one-way valves of the draining veins of testes, that allow backflow of blood into testes. This backflow produces abnormally high intra-testicular pressure and temperature, that has been confirmed by thermography and pressure estimation in various studies. Microsurgical varicocelectomy may reverse the pathologic effects on spermatogenesis in most patients, which points towards the cause and effect relationship of varicocele with testicular damage. We propose that the prolonged effect of gravity might or may not be the initiating factor for varicocele, as in our experience, around 1/4^th of hypogonadotropic hypogonadism patients who had no varicocele before treatment, developed varicocele within 3 to 6 mo of treatment with gonadotropins. Occasionally varicocele is produced by “Nutcracker phenomenon”, which is compression of left renal vein between the abdominal aorta and superior mesenteric artery. The deleterious effects of varicocele may develop slowly, causing delayed secondary infertility or rapidly, leading to azoospermia or individual may be spared of damage due to unknown factors that need further research.

High prevalence of intratesticular varicocele in a post-orchidopexy cohort

PURPOSE

Intratesticular varicocele (ITV) is an uncommon sonographic finding. A prevalence of up to 2% has been reported in men with testicular problems. In a cohort of men who had undergone prepubertal orchidopexy for acquired undescended testis, several cases of ITV were found. The aim of this study was to analyse the prevalence and clinical aspects of ITV in this cohort.

METHODS

In a long-term follow-up study of position and growth of undescended testis after prepubertal orchidopexy, ultrasonography was used to identify men with ITV. Data on clinical presentation, testicular volume, and the location, size and Doppler aspects of intratesticular varicocele were collected and analysed.

RESULTS

Of the 105 men, 9 were identified with ITV (8.6%). In all patients, the side of orchidopexy correlated with the side of the ITV, and all were left-sided. The testis with ITV had a smaller volume than the testis without ITV (p = 0.026).

CONCLUSIONS

A remarkably high prevalence of ITV (8.6%) was found as well as a smaller volume of the testes with ITV in a cohort of men who had undergone prepubertal orchidopexy for acquired undescended testis.