Investigation on DNA Binding and Photo-Cleavage Properties of Water-Soluble Porphyrin and Metalloporphyrins

In vitro toxicity evaluation of ultra-small MFe2O4 (M = Fe, Mn, Co) nanoparticles using A549 cells

As ferrite nanoparticles (MFe₂O₄) have been widely used in biomedical field, their safety evaluation has been paid great attention both in vitro and in vivo.

Development of viscometric methods for studying the interaction of various porphyrins with DNA. Part I: meso-tetra-(4N-hydroxyethylpyridyl) porphyrin and its Ni-, Cu-, Co- and Zn- containing derivatives

The influence of water soluble cationic meso-tetra(4N-hydroxyethyl)pyridyl porphyrin ( H 2 THOEtPyP 4) and it's metal complexes with Ni ( II ), Cu ( II ), Co ( II ) and Zn ( II ) on hydrodynamic and spectral behavior of DNA solutions has been studied by viscometry and UV-vis absorption methods. It was shown that the presence of planar porphyrins, such as H 2 THOEtPyP 4, NiTHOEtPyP 4 and CuTHOEtPyP 4 leads to an increase in viscosity at relatively small concentrations, and then decreases to stable values. Such behavior corresponds to intercalation of these porphyrins in DNA structure, which results in a decrease of helical twist and lengthening of the DNA molecule. In the case of porphyrins with axial ligands, such as ZnTHOEtPyP 4 and CoTHOEtPyP 4, the relative viscosity decreases, which is explained by self-stacking of these porphyrins on DNA surface. Calculation and interpretation of binding parameters (Kb and n) demonstrated good agreement of viscometric and spectrophotometric measurements.

Synthesis of neutral and cationic tripyridylporphyrin-D-galactose conjugates and the photoinactivation of HSV-1

Neutral and cationic tripyridylporphyrin-D-galactose conjugates were synthesized and their antiviral activity against herpes simplex virus type 1 (HSV-1) was evaluated. At non-cytotoxic concentrations the studied compounds show significant antiviral activity after photoactivation. The influence of photoactivation on drug treated cells was also analyzed, at different times of infection with HSV-1, for a neutral (1b) and a cationic glycoporphyrin (3b) derivative. The results show that the inhibition of the viral yield is more dependent on photoactivation for compound 1b than for compound 3b. These two compounds also differ in the inhibitory effect during the viral replicative cycle: while compound 3b inhibits the viral yield at all the addition times assayed, compound 1b is more efficient in later times of infection.