Association between neutrophils and renal impairment of rheumatoid arthritis: A retrospective cross-sectional study

Different gender of oxidative balance score on the risk of rheumatoid arthritis in the US population from NHANES

BACKGROUND

Oxidative stress is associated with risk of pathogenesis between rheumatoid arthritis. The Oxidative Balance Score (OBS) is a systematic tool to assess the effects of diet and lifestyle in relation to oxidative stress. However, the association between OBS and rheumatoid arthritis has not been reported previously. We conducted a cross-sectional study to investigate the complex association between OBS and rheumatoid arthritis in US adults.

METHODS

Overall, 9747 participants were included in this cross-sectional study. The exposure variable was OBS, which was scored by 16 dietary and four lifestyle factors. Multivariate logistic regression, subgroup analysis, and restricted cubic spline (RCS) regression were used to analyze the association between OBS and rheumatoid arthritis.

RESULTS

Compared to the lowest OBS quartile group (Q1), the multivariate corrected odds ratio (OR) (95% confidence interval [CI]) for the highest quartile of OBS (Q4) was 0.69 (0.52-0.90) (p = .013 for trend); furthermore, the RCS showed a negative linear relationship between OBS and rheumatoid arthritis. According to subgroup and RCS analyses, there was a significant difference between the association of OBS and with rheumatoid arthritis in terms of gender (p = .049).

CONCLUSION

In conclusion, high OBS was negatively associated with the risk of rheumatoid arthritis. Gender has an effect on OBS in RA. Our results suggest that OBS can be used as a biomarker to predict rheumatoid arthritis.

Association between neutrophils and renal impairment of rheumatoid arthritis: A retrospective cross-sectional study

OBJECTIVE

Previous studies have shown that increased neutrophils, as a manifestation of oxidative stress, may be involved in the progression of kidney disease. To our knowledge, little is known about the relationship between neutrophils and renal impairment in rheumatoid arthritis (RA). Therefore, we aim to investigate whether neutrophil is associated with renal impairment in RA patients.

METHODS

We retrospectively investigated the renal function of 602 RA patients in the First Affiliated Hospital of Guangzhou University of Traditional Chinese Medicine by estimated glomerular filtration rate (eGFR) from September 2018 and September 2019. The exposure variable was neutrophils, and the main outcome was eGFR. General data (gender, age, duration, hypertension, diabetes, hobbies, and medication history), whole blood markers, lipid indexes, and inflammatory indexes were collected as much as possible. We used multivariable logistic regression analysis to evaluate the association between neutrophils and renal impairment in RA participants.

RESULTS

A total of 89 cases (14.8%) had renal impairment with eGFR < 60 ml/min/1.73 m2 , and 75 cases (84.3%) were female. Subgroup analysis showed that female (odds ratio [OR] = 0.523, 95% confidence interval [CI]: 0.318-0.867, p = .011), neutrophils greater thsn 7.5 × 109 /L (OR = 2.314, 95% CI: 1.310-4.087, p = .004), NLR > 3.53 (OR = 1.757, 95% CI: 1.104-2.799, p = .018), hemoglobin less than 120 g/L (OR = 2.413, 95% CI: 1.418-4.118, p = .001), and UA > 360 μmol/L (OR = 6.052, 95% CI: 3.708-9.878, p < .001) was related to renal damage in RA. Adjusted for several confounders, the multivariable analysis indicated that neutrophils greater than 7.5 × 109 /L (OR = 1.784, 95% CI: 1.164-3.288, p = .031) was independently associated with an increased risk of renal impairment in RA.

CONCLUSION

Our study demonstrated that neutrophils greater than 7.5 × 109 /L was associated with a high risk of renal impairment in RA, suggesting that neutrophil may be a biomarker for renal impairment in RA.