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Processing-independent analysis for pro-C-type natriuretic peptide.

Solvej K Lippert1, Jens F Rehfeld, Jens P Goetze

  • 1Department of Clinical Biochemistry, Rigshospitalet, University of Copenhagen, Copenhagen, Denmark.

Journal of Immunological Methods
|August 28, 2010
PubMed
Summary

Pro-C-type natriuretic peptide (proCNP) is abundant in human seminal plasma, with concentrations significantly higher than in blood plasma. This study developed a novel assay to measure proCNP, revealing its presence in seminal fluid independent of processing.

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Area of Science:

  • Endocrinology
  • Reproductive Biology
  • Biochemistry

Background:

  • C-type natriuretic peptide (CNP) plays various physiological roles and is expressed in human tissues.
  • Understanding proCNP levels in seminal plasma is crucial for reproductive health research.

Purpose of the Study:

  • To develop and validate a processing-independent assay for quantifying proCNP-derived products in human seminal plasma.
  • To determine proCNP concentrations in seminal plasma from normal and vasectomized men.
  • To investigate potential correlations between seminal proCNP levels and male fertility parameters.

Main Methods:

  • Development of a specific immunoassay using antibodies against the N-terminus of human proCNP 11-27.
  • Pre-incubation of samples with trypsin to measure total proCNP, irrespective of post-translational modifications.
  • Quantification of proCNP in seminal plasma from healthy young men (n=120) and vasectomized men using the developed assay.
  • Molecular heterogeneity analysis of seminal proCNP via gel chromatography.

Main Results:

  • The novel assay demonstrated high binding affinity and effective measurement of total proCNP after trypsin treatment.
  • Seminal plasma from healthy young men exhibited approximately 8-fold higher proCNP concentrations (104-933 pmol/L) compared to blood plasma.
  • Gel chromatography indicated the presence of multiple molecular forms of proCNP in seminal plasma.
  • Seminal proCNP concentrations did not correlate with male fertility parameters, blood plasma proCNP, or time of abstinence.
  • Vasectomized men showed similar seminal proCNP concentrations (107-705 pmol/L) to non-vasectomized men.

Conclusions:

  • Pro-C-type natriuretic peptide is abundantly present in human seminal plasma.
  • The findings suggest that seminal proCNP originates from the prostate gland and/or seminal vesicles.
  • The developed assay provides a reliable tool for studying proCNP in reproductive contexts.