TY - JOUR
T1 - Pharmacokinetics of proline-rich tripeptides in the pig
AU - van der Pijl, P.C.
AU - Kies, A.K.
AU - ten Have, G.A.M.
AU - Duchateau, G.S.M.J.E.
AU - Deutz, N.E.
PY - 2008/1/1
Y1 - 2008/1/1
N2 - Tripeptides may possess bioactive properties. For instance, blood pressure lowering is attributed to the proline-rich tripeptides Ile-Pro-Pro (IPP), Leu-Pro-Pro (LPP), and Val-Pro-Pro (VPP). However, little is known about their absorption, distribution, and elimination characteristics. The aim of this study was to characterize the pharmacokinetic behavior of IPP, LPP, and VPP in a conscious pig model. Synthetic IPP, LPP, and VPP were administered intravenously or intragastrically (4.0 mg kg(-1) BW in saline) to 10 piglets (approximately 25 kg body weight) in the postabsorptive state. After intravenous dosing, the elimination half-life for 1PP was significantly higher (P <0.001) than for LPP and VPP (2.5 +/- 0.1, 1.9 +/- 0.1, and 2.0 +/- 0.1 min, respectively). After intragastric dosing, however, the elimination half-lives were not significantly different between the peptides (9 +/- 1, 15 +/- 4, and 12 +/- 6 min, respectively). Maximum plasma concentrations were about 10 nmol l(-1) for the three tripeptides. The fraction dose absorbed was 0.077 +/- 0.010, 0.059 +/- 0.009, and 0.073 +/- 0.015%, for IPP, LPP, and VPP, respectively. Proline-rich tripeptides reach the blood circulation intact, with an absolute bioavailability of about 0.1% when administered via a saline solution. Because half-lives of absorption and elimination were maximally about 5 and 15 min, respectively, this suggests that under these conditions a bioactive effect of these tripeptides would be rather acute.
AB - Tripeptides may possess bioactive properties. For instance, blood pressure lowering is attributed to the proline-rich tripeptides Ile-Pro-Pro (IPP), Leu-Pro-Pro (LPP), and Val-Pro-Pro (VPP). However, little is known about their absorption, distribution, and elimination characteristics. The aim of this study was to characterize the pharmacokinetic behavior of IPP, LPP, and VPP in a conscious pig model. Synthetic IPP, LPP, and VPP were administered intravenously or intragastrically (4.0 mg kg(-1) BW in saline) to 10 piglets (approximately 25 kg body weight) in the postabsorptive state. After intravenous dosing, the elimination half-life for 1PP was significantly higher (P <0.001) than for LPP and VPP (2.5 +/- 0.1, 1.9 +/- 0.1, and 2.0 +/- 0.1 min, respectively). After intragastric dosing, however, the elimination half-lives were not significantly different between the peptides (9 +/- 1, 15 +/- 4, and 12 +/- 6 min, respectively). Maximum plasma concentrations were about 10 nmol l(-1) for the three tripeptides. The fraction dose absorbed was 0.077 +/- 0.010, 0.059 +/- 0.009, and 0.073 +/- 0.015%, for IPP, LPP, and VPP, respectively. Proline-rich tripeptides reach the blood circulation intact, with an absolute bioavailability of about 0.1% when administered via a saline solution. Because half-lives of absorption and elimination were maximally about 5 and 15 min, respectively, this suggests that under these conditions a bioactive effect of these tripeptides would be rather acute.
U2 - 10.1016/j.peptides.2008.08.011
DO - 10.1016/j.peptides.2008.08.011
M3 - Article
C2 - 18789987
SN - 0196-9781
VL - 29
SP - 2196
EP - 2202
JO - Peptides
JF - Peptides
IS - 12
ER -