Abstract
The presence of plasma cholesteryl ester transfer protein (CETP) activity may be atherogenic, and, therefore, strategies to inhibit its activity or production may result in a beneficial effect on lipoprotein profiles and the disease process. The current report describes 4-phenyl-5-tridecyl-4H-1,2,4-triazole-3-thiol (PD 140195), a novel CETP inhibitor. The concentration-dependent inhibition of CETP by PD 140195 and the inhibitory monoclonal antibody (Mab) TP2 is demonstrated in a variety ofin vitro assay systems. Molecular models of PD140195 suggest a spatial mimicry of the cholesteryl ester structure. Despite the structural similarity, kinetic studies with a fluorescent cholesteryl ester analog suggest that the inhibition of transfer is not competitive. PD 140195 also selectively inhibited cholesteryl ester but not triglyceride transfer, while the Mab TP2 blocked CETP transfer of both. Studies were carried out to determine whether CETP inhibition observedin vitro could also be demonstratedin vivo. When PD 140195 was intravenously infused to anesthetized rabbits (up to 20 mg/kg), only transient CETP inhibition was observed.In vitro reconstitution studies in the presence of bovine serum albumin resulted in marked reduction of PD 140195 inhibitory activity. Thus, the low activity of PD 140195 in whole plasma probably results from binding to other plasma proteins.
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Abbreviations
- apo:
-
Apolipoprotein
- BODIPY-CE:
-
cholesteryl 4,4-difluoro-5,7-dimethyl-4-bora-3α,4α-diaza-3-indacenedodecanoate
- CETP:
-
cholesteryl ester transfer protein
- DMA/PEG 200:
-
dimethylacetamide/polyethylene glycol 200
- DMSO:
-
dimethylsulfoxide
- DTNB:
-
5,5′-dithio-bis(2-nitrobenzoic acid)
- EBTA:
-
ethylenediaminetetraacetic acid
- FCIA:
-
fluorescent cholesteryl ester transfer protein inhibition assay
- HDL:
-
high density lipoproteins
- HDL3 :
-
high density lipoproteins isolated between the densities of 1.11–1.21 g/mL
- LCAT:
-
lecithin:cholesterol acyltransferase
- LDL:
-
low density lipoproteins
- Mab:
-
monoclonal antibody
- PD 140195:
-
4-phenyl-5-tridecyl-4H-1,2,4-triazole-3-thiol
- VLDL:
-
very low density lipoprotein
- 1XDB:
-
50 mM Tris, 150 mM NaCl, 2mM ethylenediaminetetraacetic acid, pH 7.4 buffer
- β-VLDL:
-
beta migrating very low density lipoproteins
- [3H]CL-HDL3 :
-
high density lipoproteins isolated between the densities of 1.11–1.21 g/mL containing [1,2-3H]cholesteryl linoleate
- [3H]TO-HDL3 :
-
high density lipoproteins isolated between the densities of 1.11–1.21 g/mL containing [9,10-3H]triolein
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Bisgaier, C.L., Essenburg, A.D., Minton, L.L. et al. Cholesteryl ester transfer protein inhibition by PD 140195. Lipids 29, 811–818 (1994). https://doi.org/10.1007/BF02536247
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DOI: https://doi.org/10.1007/BF02536247