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Cytokines in Periodontitis — MFDS Part 1 MCQ

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HardPhysiologyCytokines in PeriodontitisMFDS Part 1

In a dysbiotic plaque-induced periodontal lesion, activated macrophages and stromal cells release mediators that increase RANKL expression, osteoclast differentiation and matrix metalloproteinase production. Which cytokine pair best accounts for this destructive host-response profile?

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Correct answer: C — Interleukin-1 beta (IL-1β) and tumour necrosis factor-alpha (TNF-α)

IL-1β and TNF-α are major pro-inflammatory mediators of periodontal tissue destruction. They amplify RANKL expression by stromal and osteoblast-lineage cells, promoting differentiation and activation of bone-resorbing osteoclasts, and stimulate pathways associated with matrix metalloproteinase production. RANKL itself is the principal direct osteoclast-differentiation signal; IL-1β and TNF-α create and reinforce the pro-resorptive environment. IL-4 and IL-13 generally favour an anti-inflammatory or reparative phenotype. IL-10, IL-1Ra and TGF-β are predominantly counter-regulatory and limit destructive inflammation. IL-2 and IL-12 support lymphocyte and Th1 responses but are not the characteristic cytokine pair driving RANKL-mediated periodontal bone loss and matrix degradation.

Reference: Martínez-García M, Hernández-Lemus E. Pro-Inflammatory and Anti-Inflammatory Interleukins in Periodontitis: Molecular Roles, Immune Crosstalk, and Therapeutic Perspectives. International Journal of Molecular Sciences. 2025;26(20):10094. https://pubmed.ncbi.nlm.nih.gov/41155385/