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Abstract

Water-insoluble α-glucans are synthesized from sucrose by glucosyltransferase-I of mutans streptococci and play an important role in the development of dental plaque. Several types of β-glucans in fungal cell wall components and water-soluble α-glucans from Streptococcus mutans are known to modulate innate immunity. In the present study, we investigated whether water-insoluble α-glucans also induced inflammatory innate immune responses. Our results showed that water-insoluble α-glucans synthesized by Streptococcus sobrinus activated mouse peritoneal exudate macrophages to produce pro-inflammatory cytokines. The immunological responses were not due to contamination by sucrose, water-soluble α-glucan, lipopolysaccharide, or peptidoglycan. Furthermore, human monocytes stimulated by water-insoluble α-glucans produced TNF-α and IL-8, while human polymorphonuclear cells were activated by water-insoluble α-glucans, resulting in chemotaxis and hydrogen peroxide production. The results demonstrated that water-soluble α-glucans modulate macrophage- and granulocyte-induced inflammatory immune responses, and suggest that inflammation induced by those α-glucans is associated with the development of periodontal diseases.

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Inflammatory Immune Responses by Water-insoluble α-glucans

Abstract

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