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Spontaneous degenerative polyarthritis in male New Zealand black/KN mice
K Nakamura1, S Kashiwazaki, K Takagishi
1Department of Biochemistry, Kitasato University School of Medicine, Kanagawa, Japan.
Abstract:
Histopathologic studies and radiographic analysis revealed that male New Zealand black/KN (NZB/KN) mice develop degenerative polyarthritis in the joints of the forepaw and hindpaw beginning at age 2 months. Deposits of autoantibodies were observed on proliferating collagen fibers, nuclei of chondrocytes, and epidermal cells. Increases in the frequency of positivity for rheumatoid factor and anti-type II collagen antibodies and in the level of serum oxidation activity were noted in these mice. The joint disease in male NZB/KN mice was transferable to female NZB/KN mice and male BALB/c mice by intraperitoneal injection of spleen cells from the male NZB/KN mice. This animal model of arthritis will be extremely useful for analyzing not only the pathogenesis of rheumatoid arthritis, but also new strategies for its treatment, since NZB/KN mice, unlike MRL/lpr mice, do not develop severe lupus nephritis or lymph-adenopathy, and therefore have a longer survival period.
Insights
Male New Zealand black/KN (NZB/KN) mice spontaneously develop polyarthritis, a joint disease characterized by autoantibody deposits. This transferable condition offers a valuable model for studying rheumatoid arthritis pathogenesis and treatment strategies.
Area of Science:
- Immunology
- Rheumatology
- Animal Models
Background:
- Rheumatoid arthritis (RA) is a chronic autoimmune disease causing joint inflammation and damage.
- Existing animal models for RA research have limitations, such as rapid mortality or lack of specific disease characteristics.
Purpose of the Study:
- To characterize a spontaneous polyarthritis model in male New Zealand black/KN (NZB/KN) mice.
- To evaluate the utility of this model for investigating rheumatoid arthritis pathogenesis and therapeutic interventions.
Main Methods:
- Histopathologic examination and radiographic analysis of joints in NZB/KN mice.
- Detection of autoantibodies, rheumatoid factor, anti-type II collagen antibodies, and serum oxidation activity.
- Spleen cell transfer experiments to assess disease transmissibility.
Main Results:
- Male NZB/KN mice aged 2 months onwards exhibited degenerative polyarthritis in paws.
- Autoantibody deposits were found on collagen fibers, chondrocytes, and epidermal cells.
- Increased rheumatoid factor, anti-type II collagen antibodies, and serum oxidation activity were observed. Disease was transferable via spleen cells.
Conclusions:
- NZB/KN mice provide a novel, spontaneous animal model for polyarthritis.
- This model is suitable for studying rheumatoid arthritis pathogenesis due to its specific joint pathology and longer survival compared to other models like MRL/lpr mice.
- The model facilitates the evaluation of new treatment strategies for rheumatoid arthritis.