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Radioligand binding assay of progesterone receptors on normal fertile human sperm membrane / 中华男科学杂志
National Journal of Andrology ; (12): 114-117, 2007.
Article in Chinese | WPRIM | ID: wpr-289038
ABSTRACT
<p><b>OBJECTIVE</b>To investigate the progesterone-binding site on the normal fertile human sperm membrane after 2 hours of in vitro capacitation.</p><p><b>METHODS</b>Viable spermatozoa were selected by a swim-up method. After 2 hours of in vitro capacitation, multipoint saturation binding experiments were performed. Sperm suspension and increasing concentrations of progesterone-11alpha-glucuronide-[125I] iodotyramine (125I-P) were added to 7 total binding tubes respectively, and equal amounts of sperm suspension and 125I-P were added to another 7 corresponding non-specific binding tubes in the presence of 10 micromol/L progesterone. After incubation for 1 hour at 4 degrees C, the radioactivity of both the tubes and the pellets after centrifugation was measured respectively. The equilibrium dissociation constant (Kd) and maximum binding capacity (Bmax) were calculated using the mathematical model of single site multi-point saturation method of Scatchard function and least-squares regression.</p><p><b>RESULTS</b>Kd was (0.61 +/- 0.04) nmol/L and Bmax was (830 +/- 344) sites/cell. The significance test of the regression equation indicated that r = -0.980, P < 0.01.</p><p><b>CONCLUSION</b>There is a high affinity and low capacity binding site for the progesterone (progesterone receptor) on the normal fertile human sperm membrane.</p>
Subject(s)
Full text: Available Index: WPRIM (Western Pacific) Main subject: Progesterone / Radioligand Assay / Sperm Capacitation / Spermatozoa / Receptors, Progesterone / Cell Membrane / Chemistry Limits: Adult / Humans / Male Language: Chinese Journal: National Journal of Andrology Year: 2007 Type: Article

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Full text: Available Index: WPRIM (Western Pacific) Main subject: Progesterone / Radioligand Assay / Sperm Capacitation / Spermatozoa / Receptors, Progesterone / Cell Membrane / Chemistry Limits: Adult / Humans / Male Language: Chinese Journal: National Journal of Andrology Year: 2007 Type: Article