title: Inflammation, longevity, and cardiovascular diseases: role of polymorphisms of TLR4.
abstract: The total burden of infection at various sites may affect the progression of atherosclerosis, the risk being modulated by host genotype. The role of lipopolysaccaride receptor TLR4 is paradigmatic. It initiates the innate immune response against gram-negative bacteria; and TLR4 polymorphisms, as ASP299GLY, suggested to attenuate receptor signaling, have been described. We demonstrated that TLR4 ASP299GLY polymorphism shows a significantly lower frequency in patients affected by myocardial infarction compared to controls, whereas centenarians show a higher frequency. Thus, people genetically predisposed to developing weak inflammatory activity, seem to have fewer chances of developing cardiovascular diseases (CVD) and, subsequently, live longer if they do not become affected by serious infectious diseases. These results are in agreement with our other data demonstrating how genetic background may exert the opposite effect with respect to inflammatory components in CVD and longevity. In the present report, to validate this hypothesis, the levels of interleukin (IL)-6, a pro-inflammatory cytokine involved in atherosclerosis and longevity, were determined by an enzyme-linked immuno-sorbent assay (ELISA) in supernatants from a whole blood assay after stimulation with subliminal doses of lipopolysaccaride (LPS) from Escherichia coli (E. coli). The samples, genotyped for the ASP299GLY polymorphism, were challenged with LPS for 4, 24, and 48 h. What we found was that Il-6 values were significantly lower in carriers bearing TLR4 mutation. Therefore, the pathogen burden, by interacting with host genotype, determines the type and intensity of the immune-inflammatory responses accountable for pro-inflammatory status, CVD, and unsuccessful aging. On the other hand, our present data seem to explain the inconclusive results obtained in case-control studies taking into account the role of functional IL-6 polymorphisms in successful and unsuccessful aging. In fact, IL6 levels seem to depend, in addition, on IL-6 polymorphisms and on innate immunity gene polymorphisms as well.
authors.affiliation: Gruppo di Studio sull'Immunosenescenza, Dipartimento di Biopatologia e Metodologie Biomediche, Palermo, Italy. gcandore@unipa.it
authors.forename: Giuseppina
authors.initials: G
authors.lastname: Candore
authors.forename: Alessandra
authors.initials: A
authors.lastname: Aquino
authors.forename: Carmela Rita
authors.initials: CR
authors.lastname: Balistreri
authors.forename: Matteo
authors.initials: M
authors.lastname: Bulati
authors.forename: Daniele
authors.initials: D
authors.lastname: Di Carlo
authors.forename: Maria Paola
authors.initials: MP
authors.lastname: Grimaldi
authors.forename: Florinda
authors.initials: F
authors.lastname: Listì
authors.forename: Valentina
authors.initials: V
authors.lastname: Orlando
authors.forename: Sonya
authors.initials: S
authors.lastname: Vasto
authors.forename: Marco
authors.initials: M
authors.lastname: Caruso
authors.forename: Giuseppina
authors.initials: G
authors.lastname: Colonna-Romano
authors.forename: Domenico
authors.initials: D
authors.lastname: Lio
authors.forename: Calogero
authors.initials: C
authors.lastname: Caruso
mesh_terms: D000208:Acute Disease; D000328:Adult; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D020022:Genetic Predisposition to Disease; D006579:Heterozygote; D006801:Humans; D007249:Inflammation / Q000235:genetics* / Q000276:immunology; D015850:Interleukin-6 / Q000235:genetics / Q000276:immunology; D008070:Lipopolysaccharides / Q000494:pharmacology; D008136:Longevity / Q000235:genetics* / Q000276:immunology; D008297:Male; D008875:Middle Aged; D009154:Mutation; D009203:Myocardial Infarction / Q000235:genetics*; D011110:Polymorphism, Genetic / Q000235:genetics* / Q000276:immunology; D013997:Time Factors; D051197:Toll-Like Receptor 4 / Q000235:genetics*
chemical_list: D015850:Interleukin-6; D008070:Lipopolysaccharides; D051197:Toll-Like Receptor 4