Gamma 2-MSH immunoreactivity in the human heart.
In patients undergoing aorto-coronary by-pass surgery, we found a 26% arterial-venous difference of immunoreactive gamma 2-melanocytostimulating hormone (MSH), a proopiomelanocortin (POMC) derived peptide known to possess profound hemodynamic effects. These results prompted an investigation of the presence of gamma 2-MSH in the human heart. Using a two-step extraction procedure, regions of human hearts were examined by sensitive and specific radioimmunoassays to determine their gamma 2-MSH content. Mean (+/- SEM) concentrations of 0.14 +/- 0.023 pmol/g and 0.12 +/- 0.017 were found in right atrium and right ventricle, respectively. High performance liquid chromatography indicated that 80-90% of the total immunoreactivity eluted in a single sharp peak in a position identical to that of synthetic gamma 2-MSH.
Department of Psychiatry, University of Lund, Sweden.
R
R
Ekman
A
A
Bjartell
B
B
Lisander
L
L
Edvinsson
D002851:Chromatography, High Pressure Liquid; D006325:Heart Atria / Q000032:analysis; D006352:Heart Ventricles / Q000032:analysis; D006801:Humans; D009074:Melanocyte-Stimulating Hormones / Q000032:analysis* / Q000302:isolation & purification; D009206:Myocardium / Q000032:analysis*; D011863:Radioimmunoassay
D009074:Melanocyte-Stimulating Hormones