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Sjögren's syndrome is a poorly understood autoimmune inflammatory illness that affects the salivary and lacrimal glands as well as other organ systems. We undertook the present study to determine whether mice immunized with short peptides from the 60-kDa Ro (or SSA) Ag, which is a common target of the autoimmunity of Sjögren's syndrome, develop an illness similar to Sjögren's syndrome. BALB/c mice were immunized with one of two short peptides from 60-kDa Ro that are know to induce epitope spreading. The animals were analyzed for the presence of anti-Ro and anti-La (or SSB) in the sera by immunoblot and ELISA. Salivary glands were collected and examined by histology after H&amp;E staining. Salivary lymphocytes were purified and studied for cell surface makers by fluorescence-activated cell sorting. Timed stimulated salivary flow was measured. As reported previously, BALB/c mice immunized with 60-kDa Ro peptides developed an immune response directed against the entire Ro/La ribonucleoprotein particle that was similar to that found in humans with lupus or Sjögren's syndrome. Functional studies showed a statistical decrease in salivary flow in immunized mice compared with controls. Furthermore, there were lymphocytic infiltrates in the salivary glands of immunized animals that were not present in controls. The infiltrates consisted of both CD4- and CD8+ T lymphocytes as well as B lymphocytes. BALB/c mice immunized with 60-kDa Ro peptides develop anti-Ro, salivary gland lymphocyte infiltrates, and salivary dysfunction that is highly reminiscent of human Sjögren's syndrome.

the journal of immunology/the journal of immunology

Immunization with Short Peptides from the 60-kDa Ro Antigen Recapitulates the Serological and Pathological Findings as well as the Salivary Gland Dysfunction of Sjögren’s Syndrome