Augmented lipopolysaccharide-induction of the histamine-forming enzyme in streptozotocin-induced diabetic mice.
Disorders of the microcirculation and reduced resistance to infection are major complications in diabetes. Histamine enhances capillary permeability, and may also reduce cellular immunity. Here we demonstrate that streptozotocin (STZ)-induced diabetes in mice not only enhances the activity of the histamine-forming enzyme, histidine decarboxylase (HDC), but also augments the lipopolysaccharide (LPS)-induced elevation of HDC activity in various tissues, resulting in a production of histamine. The augmentation of HDC activity occurred as early as 2 days after STZ injection, but was not seen in nondiabetic mice. When given to STZ-treated mice, nicotinamide, an inhibitor of poly(ADP-ribose) synthetase, reduced both the elevation of blood glucose and the elevations of HDC activity and histamine production. These results suggest that hyperglycemia may initiate a sequence of events leading not only to an enhancement of basal HDC activity, but also to a sensitization of mice to the HDC-inducing action of LPS. We hypothesize that bacterial infections and diabetic complications may mutually exacerbate one another because both involved an induction of HDC.
Oguri
Senri
S
Department of Oral and Maxillofacial Surgery, Graduate School of Dentistry, Tohoku University, 4-1 Seiryo-machi, Aoba-ku, 980-8575, Sendai, Japan.
Motegi
Katsutoshi
K
Endo
Yasuo
Y
D000818:Animals; D001786:Blood Glucose / Q000187:drug effects; D003921:Diabetes Mellitus, Experimental / Q000201:enzymology*; D006632:Histamine / Q000032:analysis / Q000096:biosynthesis; D006640:Histidine Decarboxylase / Q000037:antagonists & inhibitors / Q000096:biosynthesis*; D008070:Lipopolysaccharides; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D009536:Niacinamide / Q000494:pharmacology; D013311:Streptozocin / Q000037:antagonists & inhibitors; D013997:Time Factors; D015854:Up-Regulation
D001786:Blood Glucose; D008070:Lipopolysaccharides; D009536:Niacinamide; D013311:Streptozocin; D006632:Histamine; D006640:Histidine Decarboxylase