Abstract |
No evidence of premature vascular disease is found in apolipoprotein A-I(Milano) ( apoA-I(M)) human carriers, despite very low high density lipoprotein ( HDL) cholesterol levels. Whether apoA-I(M) may impart a "gain of function" in atherosclerosis protection compared to wild-type apoA-I is hotly debated. To address this question, knock-in mice expressing human apoA-I or apoA-I(M) were crossed with atherosclerosis-susceptible mice expressing the human apoB/A-II transgene (h-B/A-II/A-I(Hu/Hu) and h-B/A-II/A-I(M)(Hu/Hu)). On a chow diet, h-B/A-II/A-I(M)(Hu/Hu) mice were characterized by low HDL cholesterol levels compared to h-B/A-II/A-I(Hu/Hu) mice (35.65+/-8.00 mg/dl versus 58.09+/-13.50mg/dl, respectively; p<0.005). Gender differences in response to high fat diet were observed in both h-B/A-II/A-I(M)(Hu/Hu) and h-B/A-II/A-I(Hu/Hu) lines. h-B/A-II/A-I(M)(Hu/Hu) females had higher total cholesterol levels compared to h-B/A-II/A-I(Hu/Hu) females (895.08+/-183.07 mg/dl versus 544.43+/-116.42 mg/dl; p<0.05) and developed larger atherosclerotic lesions (148,260+/-78,924 microm(2) versus 54,132+/-43,204 microm(2), respectively; p<0.05). On the contrary, no difference in mean lesion area was found between h-B/A-II/A-I(M)(Hu/Hu) and h-B/A-II/A-I(Hu/Hu) males (19,779+/-6,098 microm(2) versus 15,706+/-13,095 microm(2); p=0.685). Our data suggest that, in the atherosclerosis-susceptible human apoB/A-II mouse model, expression of the human apoA-I(M) gene does not have protective advantage over that of the apoA-I gene.
|
Authors | Cinzia Parolini, Giulia Chiesa, Elaine Gong, Silvia Caligari, Miriam M Cortese, Teiichiro Koga, Trudy M Forte, Edward M Rubin |
Journal | Atherosclerosis
(Atherosclerosis)
Vol. 183
Issue 2
Pg. 222-9
(Dec 2005)
ISSN: 0021-9150 [Print] Ireland |
PMID | 16285990
(Publication Type: Comparative Study, Journal Article, Research Support, N.I.H., Extramural, Research Support, U.S. Gov't, Non-P.H.S.)
|
Chemical References |
- Apolipoprotein A-I
- apolipoprotein A-I Milano
- DNA
|
Topics |
- Animals
- Apolipoprotein A-I
(blood, genetics)
- Atherosclerosis
(blood, genetics, pathology)
- Blotting, Western
- DNA
(genetics)
- Diet, Atherogenic
- Disease Models, Animal
- Female
- Gene Expression
- Genotype
- Humans
- Male
- Mice
- Mice, Knockout
- Nephelometry and Turbidimetry
- Polymerase Chain Reaction
- Risk Factors
- Sex Factors
|