ABSTRACT
Objective To investigate the effect and mechanism of G protein coupled receptor 119 ( GPR119) in regulating lipid metabolism. Methods ( 1) Macrophage THP-1 was induced by oxidized low density lipoprotein ( oxLDL) to the formation of lipid foam cells, protein expression of GPR119, hypoxia-inducible factor-1α(HIF-1α), vascular endothelial growth factor (VEGF) were detected by Western blotting. (2) Constructing GPR119 over-expressed and low-expressed plasmids, the plasmids were transfected into THP-1 cells which induced by oxLDL. The lipid content in macrophages was observed by oil red O staining. Cholesterol efflux was detected by liquid scintillation counter. The mRNA and protein expressions of HIF-1α, VEGF were detected by reverse transcription PCR and Western blotting. (3) Constructing GPR119, HIF-1α, and VEGF over-expressed plasmids, then co-transfection of GPR119 and HIF-1α/VEGF plasmids. The lipid content in macrophages was observed by oil red O staining. Cholesterol efflux was detected by liquid scintillation counter. Results Compared with the control group, the lipid droplets were densely distributed in macrophages, with a large number and volume. The protein expression of GPR119 was significantly decreased and HIF-1α, VEGF were significantly increased in macrophages induced by oxLDL ( P<0.05). After over-expression of GPR119, the lipid droplets were sparsely distributed and the number was significantly reduced in macrophages, the lipid droplets were mostly located in the area around the cells. The cholesterol efflux was significantly increased ( P<0. 01 ) . The mRNA and protein expressions of HIF-1α and VEGF were significantly decreased ( P<0.01) . On the contrary, in the GPR119 inhibition group, the lipid droplets were densely distributed in macrophages, with a large number and volume. The lipid droplets even covered the nuclei. The cholesterol efflux was significantly reduced (P<0.05). The mRNA and protein expression of HIF-1α, VEGF were significantly increased ( P<0.05) . After GPR119 were co-expressed with HIF-1αand VEGF, the number of lipid droplets was increased, lipid droplets were dense and bulky in oxLDL-induce macrophages. The cholesterol efflux was inhibited. Conclusion GPR119 can regulate lipid metabolism and possibly by down-regulating the expression of HIF-1αand VEGF.
ABSTRACT
Objective@#To investigate the effect and mechanism of G protein coupled receptor 119 (GPR119) in regulating lipid metabolism.@*Methods@#(1) Macrophage THP-1 was induced by oxidized low density lipoprotein (oxLDL) to the formation of lipid foam cells, protein expression of GPR119, hypoxia-inducible factor-1α (HIF-1α), vascular endothelial growth factor (VEGF) were detected by Western blotting. (2) Constructing GPR119 over-expressed and low-expressed plasmids, the plasmids were transfected into THP-1 cells which induced by oxLDL. The lipid content in macrophages was observed by oil red O staining. Cholesterol efflux was detected by liquid scintillation counter. The mRNA and protein expressions of HIF-1α, VEGF were detected by reverse transcription PCR and Western blotting. (3) Constructing GPR119, HIF-1α, and VEGF over-expressed plasmids, then co-transfection of GPR119 and HIF-1α/VEGF plasmids. The lipid content in macrophages was observed by oil red O staining. Cholesterol efflux was detected by liquid scintillation counter.@*Results@#Compared with the control group, the lipid droplets were densely distributed in macrophages, with a large number and volume. The protein expression of GPR119 was significantly decreased and HIF-1α, VEGF were significantly increased in macrophages induced by oxLDL (P<0.05). After over-expression of GPR119, the lipid droplets were sparsely distributed and the number was significantly reduced in macrophages, the lipid droplets were mostly located in the area around the cells. The cholesterol efflux was significantly increased (P<0.01). The mRNA and protein expressions of HIF-1α and VEGF were significantly decreased (P<0.01). On the contrary, in the GPR119 inhibition group, the lipid droplets were densely distributed in macrophages, with a large number and volume. The lipid droplets even covered the nuclei. The cholesterol efflux was significantly reduced (P<0.05). The mRNA and protein expression of HIF-1α, VEGF were significantly increased (P<0.05). After GPR119 were co-expressed with HIF-1α and VEGF, the number of lipid droplets was increased, lipid droplets were dense and bulky in oxLDL-induce macrophages. The cholesterol efflux was inhibited.@*Conclusion@#GPR119 can regulate lipid metabolism and possibly by down-regulating the expression of HIF-1α and VEGF.
ABSTRACT
Objective We analysed the homocysteine level and distribution of ganzhou city crowd ,learned about its elevatory sit‐uation ,and provided theory basis for the intervention of high homocysteine level crowd and the prevention of heart and head blood vessel disease .Methods We detected the blood homocysteine level of 6419 adults who had physical examination in our hospital dur‐ing 2012 by enzymatic methods ,and analyzed the diagnose rate of HHcy and the distributions of Hcy in different age and gender . Results The total detection rate of high homocysteine level in 6419 adults was 39 .11% ,among which 47 .30% in male and 22 .49% in female ,the comparison was statistically significant (χ2 = 424 .28 ,P< 0 .05) ;the detection rate of male was higher than female .In different ages ,the detection rates were statistically significant comparatively (P< 0 .05) .The detection rate of homocys‐teine level in both gender rises with age .At the same time ,homocysteine levels in males of 25 - 34 years old age group and 35 - 44 years old age group ,45 - 54 years old age group and 55 - 64 yeas old age group were not statistically significant ;while there were statistical differences of Hcy level in the rest age groups of male ,different age groups of female and same age different gender groups (P< 0 .05) .Conclusion The HHcy detection rate and the blood Hcy distribution of Ganzhou city crowd has its regional characteristics compared with other regions ,and it may be associated with the main population distribution of hakka people and oth‐er geological factors .The detection rate of HHcy was relatively high ,and it′s advisable to take early prevention to lower the risk of heart and head blood vessel disease .