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Circulating and PBMC Lp-PLA2 Associate Differently with Oxidative Stress and Subclinical Inflammation in Nonobese Women (Menopausal Status)
Published: Thursday, February 16, 2012
Author: Jean Kyung Paik et al.

by Jean Kyung Paik, Ji Young Kim, Oh Yoen Kim, Yonghee Lee, Tae-Sook Jeong, Gary Sweeney, Yangsoo Jang, Jong Ho Lee

Background

This study aimed to determine the association of lipoprotein-associated phospholipase A2 (Lp-PLA2) activity in circulation and peripheral blood mononuclear cells (PBMCs) with inflammatory and oxidative stress markers in nonobese women and according to menopausal status. Lp-PLA2 activity, a marker for cardiovascular risk is associated with inflammation and oxidative stress.

Methodology/Principal Findings

Eighty postmenopausal women (53.0±4.05 yr) and 96 premenopausal women (39.7±9.25 yr) participated in this study. Lp-PLA2 activities, interleukin (IL)-6, tumor necrosis factor (TNF)-a, and IL-1ß in plasma as well as in PBMCs were measured. Plasma ox-LDL was also measured. Postmenopausal women demonstrated higher circulating levels of ox-LDL and IL-6, as well as IL-6, TNF-a, and IL-1ß in PBMCs, than premenopausal women. In both groups, plasma Lp-PLA2 activity positively correlated with Lp-PLA2 activity in PBMCs and plasma ox-LDL. In premenopausal women, Lp-PLA2 activities in plasma and PBMCs positively correlated with IL-6, TNF-a, and IL-1ß in PBMCs. In postmenopausal women, plasma ox-LDL positively correlated with PBMC cytokine production. In subgroup analysis of postmenopausal women according to plasma ox-LDL level (median level: 48.715 U/L), a significant increase in Lp-PLA2 activity in the plasma but not the PBMCs was found in the high ox-LDL subgroup. Plasma Lp-PLA2 activity positively correlated with unstimulated PBMC Lp-PLA2 activity in the low ox-LDL subgroup (r?=?0.627, P<0.001), whereas in the high ox-LDL circulating Lp-PLA2 activity positively correlated with plasma ox-LDL (r?=?0.390, P?=?0.014) but not with Lp-PLA2 activity in PBMCs.

Conclusions/Significance

The lack of relation between circulating Lp-PLA2 activity and Lp-PLA2 activity in PBMCs was found in postmenopausal women with high ox-LDL. This may indicate other sources of circulating Lp-PLA2 activity except PBMC in postmenopausal women with high ox-LDL. We also demonstrated that circulating Lp-PLA2 and PBMC secreted Lp-PLA2 associate differently with markers of oxidative stress and sub clinical inflammation in nonobese women, particularly according to the menopausal states.

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