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Titolo:
INCREASED DEGRADATION OF LIPOPROTEIN(A) IN ATHEROSCLEROTIC COMPARED WITH NONLESIONED AORTIC INTIMA-INNER MEDIA OF RABBITS - IN-VIVO EVIDENCE THAT LIPOPROTEIN(A) MAY CONTRIBUTE TO FOAM CELL-FORMATION
Autore:
NIELSEN LB; JUUL K; NORDESTGAARD BG;
Indirizzi:
GLOSTRUP UNIV HOSP,DEPT CLIN BIOCHEM,NORDRE RINGVEJ DK-2600 GLOSTRUP DENMARK UNIV COPENHAGEN,RIGSHOSP,DEPT CLIN BIOCHEM DK-2100 COPENHAGEN DENMARK UNIV COPENHAGEN,HERLEV HOSP,DEPT CLIN BIOCHEM DK-2100 COPENHAGEN DENMARK
Titolo Testata:
Arteriosclerosis, thrombosis, and vascular biology
fascicolo: 4, volume: 18, anno: 1998,
pagine: 641 - 649
SICI:
1079-5642(1998)18:4<641:IDOLIA>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
LOW-DENSITY-LIPOPROTEIN; CHOLESTEROL-FED RABBITS; HUMAN MONOCYTE-MACROPHAGES; IN-VIVO; FATTY STREAK; PLASMA; RECEPTOR; LDL; APOLIPOPROTEIN(A); LESIONS;
Keywords:
ATHEROSCLEROSIS; CHOLESTEROL; LOW-DENSITY LIPOPROTEIN; MACROPHAGES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
49
Recensione:
Indirizzi per estratti:
Citazione:
L.B. Nielsen et al., "INCREASED DEGRADATION OF LIPOPROTEIN(A) IN ATHEROSCLEROTIC COMPARED WITH NONLESIONED AORTIC INTIMA-INNER MEDIA OF RABBITS - IN-VIVO EVIDENCE THAT LIPOPROTEIN(A) MAY CONTRIBUTE TO FOAM CELL-FORMATION", Arteriosclerosis, thrombosis, and vascular biology, 18(4), 1998, pp. 641-649

Abstract

To investigate a potential role of lipoprotein(a) [Lp(a)] in foam cell formation, we have measured the degradation rates of Lp(a) and LDL in the rabbit aorta in vivo, Lp(a) (or LDL) was labeled with both I-131-TC and I-125 and injected into 17 rabbits with extensive aortic atherosclerosis and into 16 rabbits without atherosclerosis. As the proteinmoiety of the doubly labeled lipoproteins is degraded. I-131-TC is trapped in the cell, whereas I-125 diffuses out of the cell. Twenty-fourhours after injection, 12 samples of the aorta and biopsies from 9 other tissues were removed. The degradation rate of Lp(a) (percent of plasma pool per gram tissue per day) was less than that of LDL in the adrenals and in the intestine. In contrast, degradation rates of Lp(a) and LDL were similar in liver, spleen, kidney, heart, lung, skeletal muscle, and adipose tissue. In nonlesioned aortic intima-inner media, the degradation rate of Lp(a) was 39% of that of LDL (t test: P <.05 in aortic arch and thoracic aorta), whereas the degradation rates of Lp(a) and LDL were similar in atherosclerotic aortic intima-inner media. Lp(a) degradation rates were markedly increased in atherosclerotic compared with nonlesioned aortic intima-inner media: 28.2+/-9.2x10(-7)% and 5.0+/-0.6X10(-7)% of the plasma pool per gram tissue per day in the intima-inner media of the proximal segment of atherosclerotic and nonlesioned aorta, respectively (t test: P <.01). These results suggest that the metabolism of Lp(a) is different from that of LDL in nonlesioned arterial intima, possibly reflecting that Lp(a) is degraded by LDL receptors in arterial intima less efficiently than LDL. The results also indicate that the degradation rate of Lp(a) is markedly increased inatherosclerotic lesions of rabbits, supporting the idea that Lp(a) contributes to foam cell formation during the development of atherosclerosis.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/02/20 alle ore 00:06:16