Interleukin-1β induces human cementoblasts to support osteoclastogenesis

Area of Science:

• Cell Biology
• Periodontology
• Immunology

Background:

• Root resorption is a consequence of periodontium injury and inflammation.
• Osteoclast generation, responsible for resorption, may involve cementoblasts, cells in direct contact with the root surface.

Purpose of the Study:

• To investigate the role of human cementoblasts in osteoclast formation.
• To determine the effect of interleukin-1 beta (IL-1β) on this process.

Main Methods:

• Primary human cementoblasts (pHCB) were isolated from extracted teeth.
• Gene expression of pHCB for IL-1 receptors, RANKL, and OPG was analyzed.
• Co-culture systems of pHCB and osteoclast precursors (monocytes) were used to assess osteoclast formation and resorptive activity.

Main Results:

• Isolated cells expressed bone sialoprotein and IL-1 receptors, similar to a human cementoblast cell line.
• IL-1β treatment upregulated RANKL expression in pHCB.
• pHCB induced functional osteoclast formation, which was significantly enhanced by IL-1β pretreatment.

Conclusions:

• Human cementoblasts possess the capacity to induce osteoclastogenesis.
• This capacity is strongly promoted by IL-1β, offering a potential explanation for osteoclast formation adjacent to tooth roots.