Abstract
Around 25% of patients with systemic lupus erythematosus (SLE) could be refractory to conventional therapies. P-glycoprotein expression on cell surface has been implied on drug resistance, however, to date, it is unknown if P-gp serum levels are associated with SLE disease activity. Evaluate the association of serum P-gp levels and SLE with disease activity despite treatment. A cross-sectional study was conducted on 93 female SLE patients, all receiving glucocorticoids at stable doses for the previous 6 months before to baseline. SLE patients were classified into two groups: (a) patients with active disease [SLE disease activity index (SLEDAI) ≥ 3] despite treatment, and (b) patients with inactive disease (SLEDAI < 3) after treatment. Forty-three healthy females comprised the control group. Serum P-gp, anti-DNA, and both anti-nucleosome antibody levels were measured using ELISA. Active-SLE patients despite treatment had higher P-gp levels compared with inactive-SLE after treatment (78.02 ng/mL ± 114.11 vs. 33.75 ng/mL ± 41.11; p = 0.018) or versus reference group subjects (30.56 ng/mL ± 28.92; p = 0.011). P-gp levels correlated with the scores of SLEDAI (r = 0.26; p = 0.01), Mexican-SLEDAI (MEX-SLEDAI) (r = 0.32; p = 0.002), SLICC/ACR damage index (r = 0.47; p < 0.001), and with prednisone doses (r = 0.33; p = 0.001). In the multivariate model, the high P-gp levels were associated with SLICC/ACR score (p = 0.001), and SLEDAI score (p = 0.014). Our findings support a relationship between serum P-gp levels and SLE with disease activity despite treatment, but it requires further validation in longitudinal studies.
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Acknowledgements
The authors wish thank to IMSS Foundation (Fundacion IMSS, A.C.) for the support for the research. Also, the authors thank M.B., M.A., for her style correction of the manuscript
Funding
This project was financed by a Grant from the “Fondo en Investigación en Salud” del Instituto Mexicano del Seguro Social. Grant: FIS/IMSS/PROT/G14/1296. Dr Gonzalez-Lopez holds Fundacion IMSS, A.C research scholarship (Beca de Excelencia en Investigación 2016 por la Fundación IMSS, A. C.)
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This study was conducted according to the recommendations described by the 64th Declaration of Helsinki and was in accordance with the ethical standards of the Ethics and Research Board of UMAE Centro Medico Nacional de Occidente del Instituto Mexicano del Seguro Social (13-01 with approval code: R-2014-1301-77).
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Perez-Guerrero, E.E., Gamez-Nava, J.I., Muñoz-Valle, J.F. et al. Serum levels of P-glycoprotein and persistence of disease activity despite treatment in patients with systemic lupus erythematosus. Clin Exp Med 18, 109–117 (2018). https://doi.org/10.1007/s10238-017-0459-0
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DOI: https://doi.org/10.1007/s10238-017-0459-0