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Articles by Simion ASTILEAN
Total Records ( 2 ) for Simion ASTILEAN
  Carmen SOCACIU , Monica TRIF , Dumitrita RUGINA , Adela PINTEA and Simion ASTILEAN
  We aimed to demonstrate that the functionalization of nanocolloids of Au in vitro, induce the formation of conjugated forms (with glutathion) which can affect the cellular activity, as tested on Saccharomyces cerevisiae and RPE cells. The cell line relevant for macular degeneration, type RPE (line D407) proved to be more sensitive to nanogold and conjugated forms. By microscopy we demonstrated the cell capacity to form a monolayer, as a prove of their proliferation and viability, as well in the presence of free AuC, glutathione, but also in the presence of conjugated forms AuC-glutathion. AuC-glutathion conjugate, at pH 5.6 (optimum for cell growth) is stable and can have effect on cellular activity, with impact on proliferation and viability. Obviously, the interaction of AuC and AuC-glutation conjugate with cell components may have effects on cell proliferation and rapid metabolization in presence of appropriate enzymes. (e.g. Glutation peroxidase). Alternative and complementary studies are needed to show the localization of AuC and AuC-glutathion conjugate at cellular level, by microscopy and spectroscopy. It is possible that, inside cell, AuC to conjugate other biomolecules, with a higher stability and affinity, comparing to glutathion.
  Carmen SOCACIU , Andreea STANILA , Monica TRIF and Simion ASTILEAN
  Our studies aim the preparation of functionalized Au and Ag colloids invitro, the dynamics of conjugation and stability in functionalized forms (by conjugation with cysteine, glutathione, insulin, albumin) (in this first part of article) as well and to study their action on cells (second part). Such investigations can prove that natural ways of Au and Ag functionalization, by formation of stable conjugates, with S-containing biomolecules can be active at cellular level and can act synergistically as protective, antioxidant agents. We determined dimensions of colloid Au (AuC) vs colloid Ag (AgC) and found out mean values between 0.863μm to 0.86 μm.Using a calibration curve for AuC in the range 350-800 nm, we found a good correlation concentration-absorption units and the best dilutions to be used in conjugation experiments (1:2-1:5 ). The kinetic of AuC conjugation with four different molecules (cystein, BSA, insulin and glutathion), was specifically expressed by shifts of around 3 nm (for cystein, insulin and albumin) suggesting that AuC cannot make directly stable conjugates with these molecules. The same kinetic, tested for AuC-glutathion, showed spectacular change of color from red to blue and shifts of the absorbtion of conjugated forms, up to 16 nm (from 600 to 616 nm). Contrasting to Au, AgC in the presence of glutathion did not show modifications of absorptions, nor color changes. Therefore, we consider that Ag cannot conjugate glutathion and it is not useful to test it on cell cultures in vitro. Using different pHs (from 3 to 8) we observed an increase of conjugation capacity of AuC with glutathione, up to values 7-7.5. At extreme values (pH 3 and 8) the conjugation is not possible.
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