Serglycin expression in CD2+ and CD14+ cells from patients with various rheumatic diseases

Single-Cell Transcriptomes and Immune Repertoires Reveal the Cell State and Molecular Changes in Pemphigus Vulgaris

The etiology and pathogenesis of pemphigus vulgaris (PV) entail intricate interactions between immune cells and epithelial cells. However, the specific subtypes of immune cells involved in PV, along with their respective roles, remain elusive. Likewise, the precise functions and mechanisms by which glucocorticoids affect cell types within the disease context require further elucidation. To address these knowledge gaps, we performed 5' single-cell RNA sequencing, combined with V(D)J enrichment on buccal mucosal lesions and peripheral blood samples from treatment-naive patients with PV, in conjunction with post-treatment peripheral blood samples obtained after oral prednisone treatment. Our findings suggest that the IL-1α signaling pathway, myeloid APCs, inflammatory CD8+ resident memory T cells, and dysfunctional CD4+ regulatory T cells are involved in the pathogenesis of PV. Part of these findings were validated by immunohistochemical assays and multiplex immunofluorescence assays. Furthermore, our results highlight the significant impact of prednisone treatment on monocytes and mucosal-associated invariant T cells while revealing a limited effect on CD4+ regulatory T cells. Additionally, we present the CDR3 amino acid sequence of BCR related to PV disease and investigate the characteristics of TCR/BCR clonotypes. In conclusion, our study provides a comprehensive understanding of PV, particularly focusing on the mucosal-dominant type, and sheds light on the effects of glucocorticoids within the PV context. These insights hold promise for the development of new therapeutic strategies in this autoimmune disorder.

Serglycin as part of IL-1β induced inflammation in human chondrocytes

Serglycin (SRGN) is an intracellular proteoglycan produced and secreted by several cell types. The increased expression of SRGN was associated with greater aggressiveness in cancer and inflammation. In this study, we demonstrated that SRGN is increased in human chondrocytes after IL-β stimulation. Furthermore, we found that secreted SRGN was able to bind the CD44 receptor thus participating in the extension of the inflammatory response. Using SRGN knockdown cells we observed a significantly decrease in specific inflammatory markers and NF-kB activation. Similar results were observed by blocking the CD44 receptor. These data provide further evidences for a direct involvement of SRGN in the mechanisms regulating the non-infectious chondrocytes damage, and the consequent joint inflammation and cartilage destruction in arthritis.

The role of increased synovial fluid A disintegrin and metalloproteinase with thrombospondin motifs4 and serglycin levels in osteoarthritis

BACKGROUND

The first research to determine synovial fluid ADAMTS4 and serglycin levels in osteoarthritis and OA progression.

AIM

We aimed to determine ADAMTS4 and serglycin levels, interactions, and changes in the synovial fluid of knee OA, and also to determine effective in OA progression.

METHODS

A case-control study was carried out including a total of 88 participants (29 patients late OA [LOA], 28 early OA [EOA], and 30 controls). Synovial fluid serglycin and ADAMTS4 levels were measured by commercially available ELISA kits, and knee functions of the patients were evaluated with The Western Ontario and McMaster Universities Osteoarthritis score (WOMAC). Logistic regression analysis was applied for the associated with progression of OA.

RESULTS

Synovial fluid ADAMTS4 and serglycin levels were significantly higher in LOA than EOA and control groups (p < .001 and p < .001; p = .038 and p = .007, respectively). All parameters were evaluated after adjustment for age. LOA patients had significantly higher levels of WOMAC score than EOA and controls (p < .001 and p < .001). According to the logistic regression analysis, synovial fluid ADAMTS4, serglycin levels, and WOMAC score were found to be significantly associated with progression of OA.