Cell sources of inflammatory mediators present in bone marrow areas inside the meniscus


Autoři: Francisco Airton Castro Rocha aff001;  Virgínia Claudia Carneiro Girão aff002;  Rodolfo de Melo Nunes aff001;  Ana Carolina Matias Dinelly Pinto aff001;  Bruno Vidal aff003;  João Eurico Fonseca aff003
Působiště autorů: Departmento de Morfologia, Faculdade de Medicina, Universidade Federal do Ceará, Fortaleza, Ceará, Brasil aff001;  Department of Internal Medicine, Faculty of Medicine, Federal University of Ceará, Fortaleza, Ceará, Brazil aff002;  Serviço de Reumatologia e Doenças Ósseas Metabólicas, Hospital de Santa Maria, CHULN, Lisboa, Portugal aff003;  Unidade de Investigação em Reumatologia, Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Centro Académico de Medicina de Lisboa, Portugal aff004
Vyšlo v časopise: PLoS ONE 14(12)
Kategorie: Research Article
doi: 10.1371/journal.pone.0226986

Souhrn

Purpose

To demonstrate the production of inflammatory mediators by cells located in bone marrow spaces inside rodent menisci.

Methods

Mice subjected to transection of the medial collateral and anterior cruciate ligaments and meniscotomy (osteoarthritis model) or to a sham procedure, as well as non-operated (naive) mice and rats, had knee joints excised. Tissues were stained with hematoxylin-eosin and tartrate-resistant acid phosphatase (TRAP). CD68+ cells, inducible nitric oxide synthase (iNOS), interleukin (IL)-1β, and tumor necrosis factor (TNF) expression were detected using immunohistochemistry.

Results

Lamellar ossified areas, bone-entrapped osteocytes and bone marrow spaces were found inside menisci of one week up to 6 months-old naïve mice, regardless of gender. Menisci from naive rats also showed the same pattern with bone marrow areas. CD68+ cells were identified in bone marrow areas inside the meniscus of mice. TRAP+ osteoclasts, and hematogenous precursors expressing IL-1β, TNF, and iNOS were identified inside bone marrow areas in meniscal samples from both naïve and sham operated mice. Quantitative immunoexpression of IL-1 β, TNF and iNOS was more intense, P = 0.0194, 0.0293, 0.0124, respectively, in mouse knees from mice sacrificed 49 days after being subjected to an osteoarthritis (OA) model as compared to sham operated animals.

Conclusion

We provide novel data showing that rodent menisci display bone marrow areas with cells able to produce inflammatory mediators. Immunoexpression of inflammatory mediators in those bone marrow areas is significantly more pronounced in mice subjected to experimental OA

Klíčová slova:

Bone marrow – Bone marrow cells – Cell staining – Cytokines – Inflammation – Knee joints – Osteoarthritis – Skeletal joints


Zdroje

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Článek vyšel v časopise

PLOS One


2019 Číslo 12