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New strategies with greater antitumorous efficacy
Date:10/2/2007

rapies and have seen the benefits arising therefrom. They have shown that the GSH level modulating agent - oxothiazolidine-carboxylate (OTZ) increases the antitumorous effect in antitumorous cells and, at the same time, protects healthy tissue. In this way the therapeutic benefit can be increased. Nevertheless, when another GSH-level modulating agent is combined with antitumorous agents, for example, buthionine-sulphoxamide (BSO), the researchers observed that the effect of the standard drug was increased but that an increase in damage to healthy tissue also took place.

Also, with the aim of returning the cells to a more differentiated state, closer to healthy cell behaviour, this research team is investigating the use of retinoids in combination with standard agents. The response of tumorous cells to retinoids depends on the degree of differentiation of these cells. In general, highly differentiated tumorous cells are more sensitive to retinoids than moderately differentiated ones are. These latter, in response to retinoids, may trigger defence mechanisms that augment GSH levels and, in this way, increase metastatic capacity.

This is an interesting point, given that to date this different capacity that can have different cell lines within the same tumorous type has not been described. What the UPV-EHU researchers have done is to link both lines of modulation -GSH modulation and that of the differentiation inductors. They have found a link between the two the induction of differentiation with retinoids also modulates the GSH levels of tumorous cells.

Researchers are analysing the model for the concentration and administering of the agents used, given that, in the biological modulation, both elements are found to be fundamental for the success of the treatment. The concentration is not a matter of the more the better, but the optimum response involves a specific concentration, because too little or too much may produce opposite or undesire
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Contact: Irati Kortabitarte
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Elhuyar Fundazioa
Source:Eurekalert

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