Kinetic parameters for plasma beta-endorphin in lean and obese Zucker rats.
To determine plasma clearance kinetics for beta-endorphin (BE) by empirical compartmental analysis, a bolus of radioactive labeled 125I-BE was rapidly injected into a carotid artery catheter of unanesthetized lean (L) and obese (O) Zucker rats. The plasma disappearance of 125I was followed over a 3-h period. A 3-component exponential equation provided the best fit for plasma data. Plasma transit times were very short (10 s); however, plasma fractional catabolic rate was much slower. Plasma mean residence time was similar for both groups (50 min) as was recycle time (1.3 min). These data suggest that BE plasma disappearance kinetics are similar in L and O rats.
Rodd
D
D
Department of Exercise and Sport Science, Pennsylvania State University, University Park 16802.
Farrell
P A
PA
Caston
A L
AL
Green
M H
MH
D000818:Animals; D007457:Iodine Radioisotopes; D007700:Kinetics; D008297:Male; D009765:Obesity / Q000097:blood*; D051381:Rats; D011924:Rats, Zucker; D001615:beta-Endorphin / Q000097:blood*
D007457:Iodine Radioisotopes; D001615:beta-Endorphin