title: Histamine deficiency suppresses murine haptoglobin production and modifies hepatic protein tyrosine phosphorylation.
abstract: Histidine decarboxylase (HDC) synthesizes endogenous histamine from histidine in mammals. HDC-deficient mice (HDC-/-), if kept on a histamine-free diet, have no histamine in their tissues. HDC-/- mice show multiple phenotypes. In this study we show that both the constitutively expressed and turpentine-induced level of an acute-phase protein, haptoglobin, is significantly lower in the serum of HDC-/- mice compared to that of wild-type animals. This effect was abolished if HDC gene-targeted mice received histamine-rich food. No differences were found when lipopolysaccharide (LPS) was used to induce the acute-phase reaction. Using specific antibodies to phosphorylated tyrosine, we showed that protein tyrosine phosphorylation (Y-P) of approximately 50- and 26- to 27-kDa liver proteins is significantly decreased in HDC-/- mice, but that the difference was largely diminished if the animals were kept on a histamine-rich diet, suggesting that the phenotype with lower haptoglobin production is diet inducible. Upon in vivo treatment with LPS, Y-P band intensity decreased, regardless of the presence or absence of histamine. Identification of elements of the signalling pathway with decreased phosphorylation may elucidate the molecular background of the effect of endogenous histamine in the hepatic acute-phase reaction.
authors: Department of Genetics, Cell- and Immunobiology, Semmelweis University, Budapest, Hungary.
authors: K
authors: K
authors: Hegyi
authors: A K
authors: AK
authors: Fülöp
authors: S
authors: S
authors: Tóth
authors: E
authors: E
authors: Buzás
authors: T
authors: T
authors: Watanabe
authors: H
authors: H
authors: Ohtsu
authors: A
authors: A
authors: Ichikawa
authors: A
authors: A
authors: Nagy
authors: A
authors: A
authors: Falus
mesh_terms: D000210:Acute-Phase Reaction / Q000139:chemically induced / Q000378:metabolism; D000818:Animals; D015153:Blotting, Western; D017353:Gene Deletion; D006242:Haptoglobins / Q000032:analysis / Q000096:biosynthesis*; D006632:Histamine / Q000008:administration & dosage / Q000378:metabolism*; D006640:Histidine Decarboxylase / Q000172:deficiency* / Q000235:genetics; D008070:Lipopolysaccharides / Q000494:pharmacology; D008099:Liver / Q000187:drug effects / Q000378:metabolism / Q000473:pathology; D051379:Mice; D018345:Mice, Knockout; D008970:Molecular Weight; D010641:Phenotype; D010750:Phosphoproteins / Q000032:analysis / Q000737:chemistry; D010766:Phosphorylation / Q000187:drug effects; D019000:Phosphotyrosine / Q000378:metabolism*; D015398:Signal Transduction / Q000187:drug effects; D000511:alpha-Macroglobulins / Q000032:analysis
chemical_list: D006242:Haptoglobins; D008070:Lipopolysaccharides; D010750:Phosphoproteins; D000511:alpha-Macroglobulins; D019000:Phosphotyrosine; D006632:Histamine; D006640:Histidine Decarboxylase