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Type 2 diabetic mellitus is manifested by metabolic impairments with high prevalence worldwide, of which periodontitis represents a typical oral complication (also called diabetic periodontitis). Oral epithelia bear the brunt of periodontal damage from microscopic intruders; thus the defense function of epithelial cells is of vital significance. We have previously proved that 25-hydroxyvitamin D 3 (25-OHD 3 ) altered the expression of cathelicidin antimicrobial peptide in oral epithelial cells in vitro. Herein, we discovered that 25-OHD 3 intraperitoneal injection attenuated periodontal inflammation by promoting cathelicidin production in gingival epithelia and reducing fasting glucose of diabetic mice. Dotblotting of serum showed cathelicidin secretion was consistent with 25-OHD 3 treatment. Immunochemistry exhibited enhanced expression of cathelicidin and vitamin D receptors along with reduced expression of TLR4 in diabetic mice. Stereomicroscope showed less alveolar bone loss when injected with 25-OHD 3 .These results showed 25-OHD 3 can promote cathelicidin and ameliorate the severity of diabetic periodontitis. Our study complemented the mechanism of cathelicidin and extended knowledge of 25-OHD 3 's role in diabetic periodontitis.

journal of nutritional science and vitaminology

25-Hydroxyvitamin D&lt;sub&gt;3&lt;/sub&gt; Alleviates Experimental Periodontitis via Promoting Expression of Cathelicidin in Mice with Type 2 Diabetic Mellitus