Varikosel patofizyolojisi 2019

Erkek infertilitesinin en sık düzeltilebilir patolojisi olarak saptanan varikosel, normal popülasyonda yaklaşık olarak %13–15 oranlarında belirlenmektedir. Genel popülasyonda bu kadar yüksek oranlarda saptanması ve hastaların %11,7’sinde de semen parametrelerinin normal değerlerde tespit edilmesi, varikosel ve infertilite arasındaki patofizyolojik süreçlerin değerlendirilmesinde yeni araştırma konularını gündeme getirmiştir. Konvansiyonel olarak varikoselin erkek üreme sistemine olası patofizyolojik etkisi, beş ayrı mekanizma ile değerlendirilmektedir. Bu mekanizmalar; hipertermi, hipoksi, toksik sürrenal metabolitlerin reflüsü, hipogonadizm ve kadmium birikmesi olarak bildirilmektedir.

Pathophysiology of varicocele 2019

Varicocele, which is the most frequently treatable pathology of male infertility, is detected in approximately 13–15% of the normal population. Determination of such high rates in the general population and the detection of semen parameters in normal values in 11.7% of patients has led to new research topics to evaluation of the pathophysiological processes between varicocele and infertility. Conventionally, the possible pathophysiological effect of varicocele on male reproductive system is evaluated by five different mechanisms. These mechanisms are reported as hyperthermia, hypoxia, reflux of toxic cyclical metabolites, hypogonadism, and cadmium accumulation.

___

  • Marte A. The history of varicocele: from antiquity to the modern ERA. Int Braz J Urol 2018;44:563–76. [CrossRef]
  • Witt MA, Lipshultz LI. Varicocele: a progressive or static lesion? Urology 1993;42:541–3. [CrossRef]
  • World Health Organization (WHO). The influence of varicocele on parameters of fertility in a large group of men presenting to infertility clinics. Fertil Steril 1992;57:1289–93. [CrossRef]
  • Cho CL, Esteves SC, Agarwal A. Novel insights into the pathophysiology of varicocele and its association with reactive oxygen species and sperm DNA fragmentation. Asian J Androl 2016;18:186–93. [CrossRef]
  • Hassanin AM, Ahmed HH, Kaddah AN. A global view of the pathophysiology of varicocele. Andrology 2018;6:654–61. [CrossRef]
  • Garolla A, Torino M, Miola P, Caretta N, Pizzol D, Menegazzo M, et al. Twenty-four-hour monitoring of scrotal temperature in obese men and men with a varicocele as a mirror of spermatogenic function. Hum Reprod 2015;30:1006–13. [CrossRef]
  • Rao M, Zhao XL, Yang J, Hu SF, Lei H, Xia W, Lei H. Effect of transient scrotal hyperthermia on sperm parameters, seminal plasma biochemical markers, and oxidative stress in men. Asian J Androl 2015;17:668–75. [CrossRef]
  • Ji Z, Lu R, Mou L, Duan YG, Zhang Q, Wang Y, et al. Expressions of miR-15a and its target gene HSPA1B in the spermatozoa of patients with varicocele. Reproduction 2014;14:693–701. [CrossRef]
  • Kilinç F, Kayaselcuk F, Aygun C, Guvel S, Egilmez T, Ozkardes H. Experimental varicocele induces hypoxia inducible factor-1alpha, vascular endothelial growth factor expression and angiogenesis in the rat testis. J Urol 2004;172:1188–91. [CrossRef]
  • Turner TT, Lysiak JJ. Oxidative stress: a common factor in testicular dysfunction. J Androl 2008;29:488–98. [CrossRef]
  • Liang M, Wen J, Dong Q, Zhao LG, Shi BK. Testicular hypofunction caused by activating p53 expression induced by reactive oxygen species in varicocele rats. Andrologia 2015;47:1175–82. [CrossRef]
  • Kahraman CY, Tasdemir S, Sahin I, Marzioglu Ozdemir E, Yaralı O, Ziypak T, et al. The Relationship Between Endothelial Nitric Oxide Synthase Gene (NOS3)Polymorphisms, NOS3 Expression, and Varicocele. Genet Test Mol Biomarkers 2016;20:191–6. [CrossRef]
  • Agarwal A, Sharma RK, Desai NR, Prabakaran S, Tavares A, Sabanegh E. Role of oxidative stress in pathogenesis of varicocele and infertility. Urology 2009;73:461–9. [CrossRef]
  • Aitken RJ, Baker MA, Nixon B. Are sperm capacitation and apoptosis the opposite ends of a continuum driven by oxidative stress? Asian J Androl 2015;17:633–9. [CrossRef]
  • Benoff SH, Millan C, Hurley IR, Napolitano B, Marmar JL. Bilateral increased apoptosis and bilateral accumulation of cadmium in infertile men with left varicocele. Hum Reprod 2004;19:616–27. [CrossRef]
  • Almeida C, Correia S, Rocha E, Alves A, Ferraz L, Silva J, et al. Caspase signalling pathways in human spermatogenesis. J Assist Reprod Genet 2013;30:487–95. [CrossRef]
  • Santana VP, Miranda-Furtado CL, de Oliveira-Gennaro FG, dos Reis RM. Genetics and epigenetics of varicocele pathophysiology: an overview. J Assist Reprod Genet 2017;34:839–47. [CrossRef]
  • Oliveira A, Neto A, Almeida C, Silva-Ramos M, Versos R, Barros A, et al. Comparative study of gene expression in patients with varicocele by microarray technology. Andrologia 2012;44:260–5. [CrossRef]
  • Wu Q, Xing J, Xue W, Sun J, Wang X, Jin X. Influence of polymorphism of glutathione S-transferase T1 on Chinese infertile patients with varicocele. Fertil Steril 2009;91:960–2. [CrossRef]
  • Gashti NG, Salehi Z, Madani AH, Dalivandan ST 4977-bp mitochondrial DNA deletion in infertile patients with varicocele. Andrologia 2014;46:258–62. [CrossRef]
  • Demirer Z, Karademir I, Uslu AU, Güragac A, Aksu Y. The relationship between inflammation and mean platelet volume in varicocele pathophysiology. Rev Int Androl 2018;16:137–42. [CrossRef]
  • Coban S, Keles İ, Biyik İ, Guzelsoy M, Turkoglu AR, Ocak N. Does varicocele correction lead to normalization of preoperatively elevated mean platelet volume levels? Can Urol Assoc J 2015;9:E5– 9. [CrossRef]
  • Guido C, Santoro M, De Amicis F, Perrotta I, Panza S, Rago V, et al. Human sperm anatomy and endocrinology in varicocele: role of androgen receptor. Reproduction 2014;147:589–98. [CrossRef]
  • Cayan S, Kadioglu A, Orhan I, Kandirali E, Tefekli A, Tellaloglu S. The effect of microsurgical varicocelectomy on serum follicle stimulating hormone, testosterone and free testosterone levels in infertile men with varicocele. BJU Int 1999;84:1046–9. [CrossRef]
  • Yamanaka K, Fujisawa M, Tanaka H, Okada H, Arakawa S, Kamidono S. Significance of human testicular mast cells and their subtypes in male infertility. Hum Reprod 2000;15:1543–7. [CrossRef]
  • Chen B, Guo JH, Lu YN, Ying XL, Hu K, Xiang ZQ, et al. Leptin and varicocele-related spermatogenesis dysfunction: animal experiment and clinical study. Int J Androl 2009;32:532–41. [CrossRef]
  • Sirvent JJ, Bernat R, Navarro MA, Rodriguez Tolra J, Guspi R, Bosch R. Leydig cell in idiopathic varicocele. Eur Urol 1990;17:257–61. [CrossRef]
  • Abdel-Meguid TA, Farsi HM, Al-Sayyad A, Tayib A, Mosli HA, Halawani AH. Effects of varicocele on serum testosterone and changes of testosterone after varicocelectomy: a prospective controlled study. Urology 2014;84:1081–7. [CrossRef]
  • Oh YS, Jo NH, Park JK, Gye MC. Changes in Inflammatory Cytokines Accompany Deregulation of Claudin-11, Resulting in Inter-Sertoli Tight Junctions in Varicocele Rat Testes. J Urol 2016;196:1303–12. [CrossRef]
  • Koksal IT, Ishak Y, Usta M, Danisman A, Guntekin E, Bassorgun IC, Ciftcioglu A. Varicocele-induced testicular dysfunction may be associated with disruption of blood–testis barrier. Arch Androl 2007;53:43–8. [CrossRef]