A SINGLE INTRA-ARTICULAR INJECTION OF LIPOSOMALLY CONJUGATED METHOTREXATE SUPPRESSES JOINT INFLAMMATION IN RAT ANTIGEN-INDUCED ARTHRITIS

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Abstract
In this study, we sought to determine whether liposomal preparations containing a phospholipid conjugate of methotrexate and dimyristoylphosphatidylethanolamine (MTX-γ-DMPE) incorporated within their lipid membranes are effective in suppressing established joint inflammation in a monoarticular model of arthritis in the rat. Arthritis was induced in the right knee joint of Lewis rats. The rats were treated with a single intra-articular injection of either free methotrexate (MTX), liposomal MTX [MTX-multilamellar vesicles (MLV)−1.2 μm or MTX-small unilamellar vesicles (SUV)−100 nm], control liposomes (E-LIPO) or saline into the inflamed knee 7 days after arthritis induction. There was no significant difference in knee swelling in MTX-, saline-and E-LIPO-treated rats up to 21 days after treatment. However, MTX-MLV treatment produced a significant reduction in knee swelling (26.5 ± 6.0%; mean ± S.E.M.) 1 day after intra-articular injection compared with MTX (3.5 ± 3.5%) and MTX-SUV (14.4 ± 2.4%), respectively. Over the next 20 days, knee swelling in MTX-MLV-treated rats fell progressively and almost returned to normal. MTX-MLV treatment also inhibited the cellular infiltration associated with the arthritis. Large multilamellar liposomal preparations of MTX-γ-DMPE are more effective than free MTX and MTX-SUV in suppressing inflammation. Their differential effects in treating the antigen-induced arthritis model are related to their retention within the joint space.

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