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. 2024 Apr 16;6(2):100469.
doi: 10.1016/j.ocarto.2024.100469. eCollection 2024 Jun.

PLOD2 gene expression in infrapatellar fat pad is correlated with fat mass in obese patients with end-stage knee osteoarthritis

J Van den Langenbergh  1 , Y M Bastiaansen-Jenniskens  2 , G J V M van Osch  2   3 , J Runhaar  4 , S M A Bierma-Zeinstra  2   4 , K Soballe  5 , J Laursen  5 , A Liljensoe  5 , N Kops  2 , I Mechlenburg  5 , S Clockaerts  1   6
Affiliations

PLOD2 gene expression in infrapatellar fat pad is correlated with fat mass in obese patients with end-stage knee osteoarthritis

J Van den Langenbergh et al. Osteoarthr Cartil Open. .

Abstract

Objective: To investigate associations between obesity-linked systemic factors and gene expression indicative for the inflammatory and fibrotic processes in the infrapatellar fat pad (IFP), in a population of obese patients with end-stage knee osteoarthritis (KOA).

Methods: We collected human IFPs from 48 patients with a mean body mass index (BMI) of 35.44 ​kg/m2 during total knee replacement procedures. These patients were part of a randomized controlled trial and met the criteria of having OA and a BMI of ≥30 ​kg/m2. Blood samples were collected to assess serum levels of glucose, total cholesterol, HDL cholesterol, LDL cholesterol, triglycerides, and leptin. Total body composition was measured using dual-energy X-ray absorptiometry. Gene expressions of IL6, TNFA, COL1A1, IL1B, ASMA, PLOD2 in the IFP were analyzed.

Results: Univariate analysis resulted in a positive correlation between BMI and procollagen-lysine,2-oxoglutarate 5-dioxygenase 2 (PLOD2) expression (r2 ​= ​0.13). In univariate analyses of obesity-linked systemic factors and PLOD2, significant correlations were found for lean mass (r2 ​= ​0.20), fat mass (r2 ​= ​0.20), serum cholesterol (r2 ​= ​0.17), serum triglycerides (r2 ​= ​0.19) and serum leptin (r2 ​= ​0.10). A multiple linear regression model indicated fat mass to be a strong predictor of PLOD2 production in the IFP (r2 ​= ​0.22, P ​= ​0.003).

Conclusion: Our study demonstrates the positive association between fat mass and PLOD2 expression in the IFP of obese end-stage knee OA patients. This may indicate that within this patient population the fibrotic process in the IFP is influenced by systemic adipose tissue, next to local inflammatory processes.

Keywords: Fibrosis; Infrapatellar fat pad; Knee; Obesity; Osteoarthritis; PLOD2.

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Conflict of interest statement

The author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.

Figures

Fig. 1
Fig. 1
Gene expression scatter plots of determinants of fibrosis PLOD2, COL1A1, ASMA and inflammation IL6, TNFA and IL1B in correlation with BMI with CT values normalized to GADPH. Pformula imageP value of statistical significance, r2 ​= ​R squared.
Fig. 2
Fig. 2
PLOD2 gene expression (CT values normalized to GADPH) in correlation with obesity-linked systemic factors in IFP of obese end-stage KOA patients presented in scatter plots. P ​= ​P value of statistical significance, r2 ​= ​R squared.
See this image and copyright information in PMC

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