HDL remodeling during the acute phase response.

Abstract

OBJECTIVE:

The purpose of this study was to examine the interactive action of serum amyloid A (SAA), group IIA secretory phospholipase A(2) (sPLA(2)-IIA), and cholesteryl ester transfer protein (CETP) on HDL remodeling and cholesterol efflux during the acute phase (AP) response elicited in humans after cardiac surgery.

METHODS AND RESULTS:

Plasma was collected from patients before (pre-AP), 24 hours after (AP-1 d), and 5 days after cardiac surgery (AP-5 d). SAA levels were increased 16-fold in AP-1 d samples. The activity of sPLA(2)-IIA was increased from 77.7+/-38.3 U/mL (pre-AP) to 281.4+/-57.1 U/mL (AP-1 d; P<0.001). CETP mass and activity reduction was commensurate to the reduction of HDL cholesterol levels. The combined action of SAA, sPLA(2)-IIA, and CETP in vitro markedly remodeled HDL with the generation of lipid-poor apoA-I from both pre-AP and AP-1 d HDL. The net result of this remodeling was a relative preservation of ABCA1- and ABCG1-dependent cholesterol efflux during the acute phase response.

CONCLUSIONS:

Our results show that the many and complex changes in plasma proteins during the acute phase response markedly remodel HDL with functional implications, particularly the relative retention of cholesterol efflux capacity.

• Authors: Anisa Jahangiri, Maria C de Beer, Victoria Noffsinger, Lisa R Tannock, Chandrashekar Ramaiah, Nancy R Webb, Deneys R van der Westhuyzen, Frederick C de Beer
• Journal: Arteriosclerosis, thrombosis, and vascular biology (Arterioscler Thromb Vasc Biol) Vol. 29 Issue 2 Pg. 261-7 (Feb 2009) ISSN: 1524-4636 [Electronic] United States
• PMID: 19008529 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, U.S. Gov't, Non-P.H.S.)

Chemical References

• ABCA1 protein, human
• ABCG1 protein, human
• APOA1 protein, human
• ATP Binding Cassette Transporter 1
• ATP Binding Cassette Transporter, Subfamily G, Member 1
• ATP-Binding Cassette Transporters
• Apolipoprotein A-I
• CETP protein, human
• Cholesterol Ester Transfer Proteins
• Lipoproteins, HDL
• Recombinant Proteins
• Serum Amyloid A Protein
• Cholesterol
• Group II Phospholipases A2

Topics

• ATP Binding Cassette Transporter 1
• ATP Binding Cassette Transporter, Subfamily G, Member 1
• ATP-Binding Cassette Transporters (blood)
• Acute-Phase Reaction (blood, etiology)
• Apolipoprotein A-I (blood)
• Cardiac Surgical Procedures (adverse effects)
• Cholesterol (blood)
• Cholesterol Ester Transfer Proteins (blood)
• Chromatography, Affinity
• Group II Phospholipases A2 (blood)
• Humans
• Lipoproteins, HDL (blood)
• Macrophages (metabolism)
• Recombinant Proteins (metabolism)
• Serum Amyloid A Protein (metabolism)
• Time Factors