Effect of adjuvant induced arthritis on the mechanical properties and thermal behavior of skin and tendon

Anti-Inflammatory effect of INSL-3 on experimental arthritis model and LPS-induced macrophage cell line

Rheumatoid arthritis (RA) is a multifactorial autoimmune disease that affects the joints of approximately 1 % of the population worldwide and is seen 2-4 times less in males. INSL3 is a gender-specific peptide hormone produced much higher in males than in females and may have an anti-inflammatory role in RA. So, in this study, it was aimed to determine the possible anti-inflammatory effect and dose of insulin-like factor-3(INSL3) in an experimental Complete Freund's adjuvant(CFA)-induced RA male rat model and lipopolysaccharide(LPS)-induced macrophage cell line and compare it with prednisolone therapy. For in vivo experiments, 48 male mice were randomly divided into 6 groups with 8 subjects in each group: Control group, Arthritis group, Arthritis + Prednisolone(10 mg/kg) group, Arthritis + INSL3(0.08-0.8-8 μg/day) groups. Joint tissue samples obtained from sacrificed subjects were examined by histochemical and immunohistochemically methods after biometric analyses, arthritis severity scoring, and thermal latency experiments. LPS-induced macrophage cells were also treated with prednisolone(1 µg/ml) and INSL3(50-100-200 nM). Cell viability, cell morphology, and TNF-α and IL-6 immune reactivity were evaluated. According to the data obtained from in vivo analyses, it was seen that INSL3 reduced the paw diameter and arthritis severity scoring, degenerative changes, and inflammation and increased the thermal latency, compared to the arthritis group, although not as much as the prednisolone treatment group. In vitro analyses showed that high doses of INSL3 had positive effects on cell viability, morphology, TNF-α, and IL-6 immune reactivity. In conclusion, it was determined that the anti-inflammatory effect of INSL3 was not as pronounced as prednisolone, but it had a more favorable impact on macrophage cell viability and morphology. It was concluded that INSL3 may be a protective therapeutic agent in combination with existing treatment protocols in treating many autoimmune diseases.

Increased prolylhydroxylase activity in chondrocytes but not synovial cells from adjuvant arthritic rat knees

Prolylhydroxylase and galactosylhydroxylsyl glucosyl (GGH) transferase were assayed in cells cultured from cartilage and synovium (adipose type) removed from normal and adjuvant arthritic rat knees. There was a significant increase in prolylhydroxylase in chondrocytes from arthritic knees compared to the normals but no change in GGH transferase activity was found. In the cells derived from the synovium no variation in either enzyme was observed. No significant changes in DNA or protein content was found in either type of cells from the arthritic joints. Comparison of the prolylhydroxylase activity in the supernatant and pellet fractions prepared from chondrocytes from normal and arthritic joints, demonstrated that the majority of the activity was recovered in the supernatant fraction rather than the pellet in arthritic chondrocytes. The data presented indicate that the degree of hydroxylation of cartilage collagen alters in arthritis.

Effect of antigen-induced synovitis on the extensor tendons within the retinacular compartment of the dog

Antigen-induced proliferative synovitis was produced within the extensor retinacular compartment of one forepaw of young littermate dogs. The extensor tendons within the synovitis compartment were compared with the tendons in control compartments of the opposite forepaw. At 7 days following challenge, the tendons from the proliferative synovitis compartment showed increased uptake of [3H]proline at 5 min after pulse labeling. At 7, 14, and 28 days following challenge, the tendons within the proliferative synovitis compartment showed a significant increase in metabolic activity compared with control tendons after radioactive labeling for 6 h, with no associated difference in total collagen content of the control and synovitis tendons. These results indicate an increase in protein synthesis and degradation by the synovitis-surrounded tendons.