Cover
Vol. 6 No. 1 (2016)

Published: June 30, 2016

Pages: 22-31

Research Article

Estimation of Aromatase Enzyme in Obese Infertile Men

Abstract

Background: Male obesity is associated with physiological changes that can negatively affect male fertility. Obese men have demonstrated a 3-fold increase in the prevalence of oligozoospermia when compared with men with normal Body Mass Index (BMI). Objective: To estimate the role of aromatase enzyme in decreasing sperm parameters in obese infertile men. Subjects, Materials and Methods: Seventy obese infertile male (patients) and twenty obese fertile male (control) are enrolled in this study. Seminal fluid analysis done according to criteria of WHO (2010). Results: A significant negative correlation was found between human cytochrome enzyme and sperm concentration, progressively motile sperm, non-progressively motile sperm, immotile sperm and normal morphology. Conclusion: The present study showed clearly that male obesity negatively impacts fertility through direct association between increased (BMI) and semen parameters. The results suggest that increased estrogen as a result of aromatization in the fatty tissue, reflected through the increase in human cytochrome enzyme (aromatase), may be an important mechanism for the hypoandrogenemia and altered sperm parameters.

References

  1. Hammoud, A. O., Gibson, M., Peterson C. M., et al. "Obesity and male reproductive potential". J. Androl. 2006; 27, 619–626.
  2. Cheng, J. Y. & Ng, E. M. "Body mass index, physical activity and erectile dysfunction: an U-shaped relationship from population based study". Int. J. Obes. 2007; 31, 1571–1578.
  3. Simpson ER, Mahendroo MS, Means GD, at el. "Aromatase cytochrome P450, the enzyme responsible for estrogen biosynthesis". Endocrine Reviews 1994; 15, 342–355.
  4. Simpson ER."Aromatase: biologic relevance of tissue specific expression".SeminReprod Med. 2004; 22:11–23.
  5. Francisco Urbanos, Juan Fernandez-Baeza& Bruno Chaudret. "Selective aromatization of the A ring of steroids through demethylation by an Soc.,Chem. Commun. 1991; 1739-1741.
  6. Wilmut, I., Hooper, M. L. &Simons, J. P. J. "Genetic manipulation of mammals and its application in reproductive biology" J .Reprod. Fertile 1991; 92(2), 245-279.
  7. Chavarro, J. E., Toth, T. L., wright, D. L., et al. "Body mass index in relation to semen quality, sperm DNA integrity, and serum reproductive hormone levels among men attending an infertility clinic". FertilSteril. 2010; 93:2222- 2231.
  8. Swan, S. H., Elkin, E. P. &Fenster, L. "The question of declining sperm density revisited: an analysis of 101 studies published 1934– 1996. Environ. Health Perspect. 2000; 108, 961–966.
  9. Globerman, H., Shen-Orr, Z., Karnieli, E., et al." Inhibin B in men with severe obesity and after weight reduction following gastroplasty". Endocr. Res. 2005; 31, 17–26.
  10. Padubidri, VG; Daftary, SN, eds. "Shaw's Textbook of Gynaecology". 2011; (15th ed.). p. 201.
  11. L. Gennari, R. Nuti, & J. P. Bilezikian, “Aromatase activity and bone homeostasis in men,” Journal of Clinical Endocrinology and Metabolism, 2004; vol. 89, no. 12, pp. 5898–5907,
  12. W. de Ronde, H. A. P. Pols, J. P. T. M.et al."The importance of oestrogens in males,” Clinical Endocrinology, (2003) vol. 58, no. 5, pp. 529–542.
  13. E. Simpson, M. Jones, S. Davis, et al. “Do intracrine mechanisms regulate 30 aromatase expression?” Journal of Steroid Biochemistry and Molecular Biology, 1999; vol. 69, no. 1–6, pp. 447–452.
  14. F. Labrie, A. Bélanger, L. Cusan, et al “Physiological changes in dehydroepiandrosterone are not reflected by serum levels of active androgens and estrogens but of their metabolites:intracrinology,” Journal of Clinical Endocrinology and Metabolism, 1997;vol. 82, no. 8, pp. 2403–2409.
  15. T. Yanase, Y. M. Mu, Y. Nishi, et al. “Regulation of aromatase by nuclear receptors,” Journal of Steroid Biochemistry and Molecular Biology, 2001; vol.79, no. 1–5, pp. 187–192.
  16. Y. M. Mu, T. Yanase, Y. Nishi, et al. “Combined treatment with specific ligands for PPARγ:RXR nuclear receptor system markedly inhibits the expression of cytochrome P450arom in human granulosa cancer cells, “Molecular and Cellular Endocrinology, 2001; vol. 181, no. 1–2, p.239– 248.
  17. Hofny, E. R., Ali, M.E., Abdel- Hafez, H.Z., et al. "Semen parameters and hormonal profile in obese fertile and infertile males". Fertil. Steril. 2010; 94, 581-4.
  18. Fejes, I. "Effect of body weight on testosterone/estradiol ratio in oligozoospermic patients". Arch. Androl. (2006); 52, 97–102. 31
  19. Hammoud, A. O., Wilde, N., Gibson, M., at el."Male obesity and alteration in sperm parameters". Fertil. Steril. 2008; 90, 2222–2225.
  20. Kort HI, Massey JB, Elsner CW, et al. "Impact of body mass index values on sperm quantity and quality". J Androl.2006; 27:450- 452.
  21. Jensen, T. K. " Body mass index in relation to semen quality and reproductive hormones among 1,558 Danish men". Fertil. Steril. 2004; 82, 863–870.
  22. Fejes I, Koloszar S, Szollosi J, et al. "Is semen quality affected by male body fat distribution?" Andrologia, 2005; 37:155–9.
  23. Pauli, E.M., Legro, R.S., Demers, L.M., at el. "Diminished paternity and gonadal function with increasing obesity in men". Fertil Steril. 2008; 90(2):346-51.