Rheumatoid arthritis is an autoimmune disease that leads to cartilage destruction, synovial joint inflammation, and bacterial joint/bone infections. In the present work, methotrexate and minocycline-loaded nanoparticles (MMNPs) were developed with an aim to provide relief from inflammation and disease progression/joints stiffness and to control the bacterial infections associated with rheumatoid arthritis. MMNPs were developed and optimized by solvent evaporation along with high-pressure homogenization technique using poly(lactic-co-glycolic acid) (50:50%) copolymer. FTIR spectrometric results showed the compatibility nature of methotrexate, minocycline, and poly(lactic-co-glycolic acid). The MMNPs showed particle size ranging from 125.03 ± 9.82 to 251.5 ± 6.23 nm with charge of around - 6.90 ± 0.8 to - 34.8 ± 4.3 mV. The in vitro release studies showed a sustained release pattern with 75.11% of methotrexate (MTX) release and 49.11% of minocycline hydrochloride (MNC) release at 10 h. The developed MMNPs were found to be stable at refrigerated condition and non-hemolytic nature (< 22.0%). MMNPs showed superior cytotoxicity for studied concentrations (0.1 to 1000 μM) compared with free MTX at both 24 and 48 h treatment period in a dose/time-dependent manner in inflammatory RAW 264.7 cells. Anti-bacterial studies indicate that the efficacy of the developed MMNPs to control infections was compared with pure MNC. In vivo anti-arthritis showed effective arthritis reduction potential of the developed MMNPs upon intravenous administration. This proof of concept implies that MTX with MNC combined nanoparticles may be effective to treat RA associated with severe infections. Graphical abstract.
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