title: Effect of a new injectable male contraceptive on the seminal plasma amino acids studied by proton NMR spectroscopy.
abstract: Effect of RISUG, a newly developed male contraceptive, on various amino acids of seminal plasma ejaculates was studied by proton magnetic resonance spectroscopy at 400 MHz. Levels of amino acids were compared with the seminal plasma of obstructive azoospermia and controls. Glutamic acid, glutamine, and arginine were found to be high in concentration in human seminal plasma. The concentration of aromatic amino acids such as tyrosine, histidine, and phenylalanine in RISUG-injected subjects showed no significant difference compared to controls (p > 0.1); however, there was a statistically significant decrease in the concentration of these amino acids in obstructive azoospermia. The concentration of some prominent amino acids that showed overlapping resonances, such as isoleucine+leucine+valine (p < 0.01), alanine+isoleucine+lysine (p < 0.01), arginine+lysine+leucine (p < 0.01), and glutamic acid+glutamine (p < 0.01), showed a statistically significant decrease in RISUG-injected subjects compared to controls. Overlap of these amino acid resonances were noticed even at 600 MHz. In general, the total amino acids concentration in RISUG-injected subjects was found to be higher than in azoospermic subjects, confirming the occurrence of 'partial' obstructive azoospermia in subjects injected with this contraceptive.
authors.affiliation: Center for Biomedical Engineering, Indian Institute of Technology, New Delhi, India.
authors.forename: Koel
authors.initials: K
authors.lastname: Chaudhury
authors.forename: Uma
authors.initials: U
authors.lastname: Sharma
authors.forename: N R
authors.initials: NR
authors.lastname: Jagannathan
authors.forename: Sujoy K
authors.initials: SK
authors.lastname: Guha
mesh_terms: D000328:Adult; D000409:Alanine / Q000032:analysis; D000596:Amino Acids / Q000032:analysis*; D001120:Arginine / Q000032:analysis; D003272:Contraceptive Agents, Male / Q000008:administration & dosage*; D004121:Dimethyl Sulfoxide / Q000008:administration & dosage*; D018698:Glutamic Acid / Q000032:analysis; D005973:Glutamine / Q000032:analysis; D006801:Humans; D007267:Injections; D007532:Isoleucine / Q000032:analysis; D007930:Leucine / Q000032:analysis; D008239:Lysine / Q000032:analysis; D009682:Magnetic Resonance Spectroscopy; D008297:Male; D008298:Maleates / Q000008:administration & dosage*; D011091:Polyesters; D011137:Polystyrenes; D012661:Semen / Q000737:chemistry* / Q000187:drug effects*; D013343:Styrenes / Q000008:administration & dosage*; D014633:Valine / Q000032:analysis; D014649:Vas Deferens / Q000187:drug effects
chemical_list: D000596:Amino Acids; D003272:Contraceptive Agents, Male; D008298:Maleates; D011091:Polyesters; D011137:Polystyrenes; D013343:Styrenes; C440495:contraceptive agent, RISUG; D007532:Isoleucine; D005973:Glutamine; D018698:Glutamic Acid; D001120:Arginine; D007930:Leucine; D014633:Valine; D008239:Lysine; D000409:Alanine; D004121:Dimethyl Sulfoxide