Which cells break down the periodontium and release cytokines?

• A. Neutrophils
• B. Lymphocytes
• C. Fibroblasts
• D. Osteoclasts

Answer: (A)

Neutrophils are the primary responders that drive early breakdown of periodontal tissues. When bacteria from plaque invade the gingival crevice, neutrophils rush in and release a flood of inflammatory mediators, including cytokines like IL-1 and TNF-α, which rally more immune cells to the area. They also unleash proteolytic enzymes and reactive oxygen species that directly degrade connective tissue of the periodontium, including the gingival connective tissue and components of the periodontal ligament. This combination of signaling to amplify inflammation and enzymatic tissue destruction explains their central role in breaking down periodontal structures.

Lymphocytes play a bigger role in the adaptive immune response and longer-term cytokine signaling, not the immediate tissue breakdown. Fibroblasts help maintain and remodel the extracellular matrix and can modulate inflammation, but they are not the main drivers of acute periodontal tissue destruction. Osteoclasts resorb bone, contributing to alveolar bone loss, but the question focuses on the broader periodontium breakdown and cytokine release associated with the initial inflammatory process, where neutrophils are the key players.