Significant correlations between blood lipids, cytokines, and C-reactive protein in healthy humans

Chronic low-grade inflammation plays a central role in cardiometabolic disease, yet the associations between lipid metabolism and inflammatory biomarkers in generally healthy individuals remain incompletely understood. This study aimed to investigate the relationship between blood lipids, high-sensitivity C-reactive protein (hsCRP), and a broad panel of inflammatory cytokines in a healthy adult population.

A total of 165 healthy participants aged 18-44 years were recruited at the Falun County Hospital, Sweden. Blood samples were analyzed for a full lipid profile, blood counts, cytokines, and hsCRP. Plasma inflammatory protein levels were quantified using the Olink Proseek Multiplex Inflammation panel, including 92 cytokines. Statistical analysis included Spearman rank correlations and multiple testing correction using the Benjamini-Hochberg false discovery rate (FDR < 0.10).

hsCRP showed significant correlations with several lipid parameters, particularly remnants, triglycerides, apolipoprotein B (ApoB), and non-HDL cholesterol, as well as with BMI and specific leukocyte counts. Additionally, hsCRP was significantly associated with multiple cytokines, including IL-6, TNF, IL-10, and CXCL10, highlighting a complex pro- and anti-inflammatory milieu.

This study demonstrates correlations between hsCRP, lipid-related biomarkers, and inflammatory cytokines in healthy adults, underscoring the interplay between lipid metabolism and subclinical inflammation. The significant correlations between hsCRP and remnants, ApoB, and cytokines such as IL-6 support the role of these factors as early indicators of cardiometabolic risk, even in the absence of overt disease.