From Oxidised LDL to Potential Novel Applications in Gingival Crevicular Fluid Analysis.

Gingival crevicular fluid (GCF) reflects both local periodontal inflammation and systemic conditions. This review highlights the role of oxidative stress, oxidised low-density lipoprotein (oxLDL), and apolipoprotein B (apoB) as molecular links between periodontitis and metabolic disorders. Elevated GCF levels of oxLDL and apoB indicate enhanced vascular permeability and local oxidative modification, particularly in diabetes. Furthermore, oxLDL promotes the formation of neutrophil extracellular trap (NET) via connecting oxidative stress with immune-mediated tissue injury. These insights establish GCF as a valuable, non-invasive biomarker for understanding the interplay between periodontal and systemic diseases.