RESUMO
UV-B irradiation is one of the risk factors in age-related diseases. We have reported that biologically uncommon D-ß-Asp residues accumulate in proteins from sun-exposed elderly human skin. A previous study also reported that carboxymethyl lysine (CML; one of the advanced glycation end products (AGEs)) which is produced by the oxidation of glucose and peroxidation of lipid, also increases upon UV B irradiation. The formation of D-ß-Asp and CML were reported as the alteration of proteins in UV B irradiated skin, independently. In this study, in order to clarify the relationship between the formation of D-ß-Asp and CML, immunohistochemical analysis using anti-D-ß-Asp containing peptide antibodies and anti-CML antibodies was performed in UV B irradiated mice. Immunohistochemical analyses clearly indicated that an anti-D-ß-Asp containing peptide antibody and anti-CML antibody reacted at a common area in UV B irradiated skin. Western blot analyses of the proteins isolated from UV B irradiated skin demonstrated that proteins of 50-70 kDa were immunoreactive towards antibodies for both D-ß-Asp containing peptide and CML. These proteins were identified by proteomic analysis as members of the keratin families including keratin-1, keratin-6B, keratin-10, and keratin-14.
Assuntos
Ácido D-Aspártico/efeitos da radiação , Queratinas/efeitos da radiação , Lisina/análogos & derivados , Pele/efeitos da radiação , Raios Ultravioleta , Idoso , Idoso de 80 Anos ou mais , Animais , Anticorpos/química , Western Blotting , Ácido D-Aspártico/análise , Ácido D-Aspártico/química , Produtos Finais de Glicação Avançada/metabolismo , Produtos Finais de Glicação Avançada/efeitos da radiação , Humanos , Imuno-Histoquímica , Queratinas/química , Queratinas/metabolismo , Lisina/metabolismo , Lisina/efeitos da radiação , Camundongos , Proteômica , Pele/química , Pele/metabolismo , EstereoisomerismoRESUMO
Two methoxy-substituted TQEN (N,N,N',N'-tetrakis(2-quinolylmethyl)ethylenediamine) derivatives, T(MQ)EN (N,N,N',N'-tetrakis(6-methoxy-2-quinolylmethyl)ethylenediamine) and T(TMQ)EN (N,N,N',N'-tetrakis(5,6,7-trimethoxy-2-quinolylmethyl)ethylenediamine), have been prepared, and their fluorescence properties with respect to Zn2+ coordination were investigated. Introduction of a methoxy substituent at 6-position of the quinoline ring enhances the fluorescence intensity by 10-fold, and the three methoxy substituents in the 5,6,7-positions afford significant enhancement of the long-wavelength component of the fluorescence of zinc complex. The substituents did not alter the binding affinity of these compounds toward zinc ion significantly. T(MQ)EN was proved to be effective in detection of zinc ion in cells by fluorescent microscopy.
