Abstract
Histological analysis is a morphological technique and an effective method for understanding the pathology of rheumatoid arthritis (RA). RA is an inflammatory disease characterized by increased synovial tissue and osteoclasts, angiogenesis, infiltration of inflammatory cells, and pannus formation. These pathologies can be observed in a collagen-induced arthritis model mouse using formaldehyde-fixated paraffin-embedded (FFPE) samples. For the preparation of FFPE samples, the conditions of the fixation and decalcification process significantly affect tissue staining results. Since the lesion sites include bone tissue, a decalcification process is necessary when preparing an FFPE sample. Therefore, selecting an optimal condition for the fixating and decalcifying solution is important. In this chapter, we describe the procedures of preparing paraffin samples, including fixation, decalcification, embedding, and sectioning from the RA model mouse, as well as different staining methods (hematoxylin and eosin, tartrate-resistant acidphosphatase).
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