Apolipoprotein A-I and the molecular variant apoA-I(Milano): evaluation of the antiatherogenic effects in knock-in mouse model.

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.

journal_name

Atherosclerosis

journal_title

Atherosclerosis

authors

Parolini C,Chiesa G,Gong E,Caligari S,Cortese MM,Koga T,Forte TM,Rubin EM

doi

10.1016/j.atherosclerosis.2005.03.008

keywords:

subject

Has Abstract

pub_date

2005-12-01 00:00:00

pages

222-9

issue

2

eissn

0021-9150

issn

1879-1484

pii

S0021-9150(05)00209-1

journal_volume

183

pub_type

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