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Multicharged Phthalocyanines as Selective Ligands for G-Quadruplex DNA Structures.

Catarina I V Ramos1, Susana P Almeida2, Leandro M O Lourenço3

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Multicharged phthalocyanines show promise for cancer therapy by stabilizing G-Quadruplex DNA. Researchers found specific charge configurations enhance selectivity for G-Quadruplex over duplex DNA, crucial for telomerase inhibition.

Keywords:
G-QuadruplexesG4-FIDUV-Viscircular dichroismhyperchromismmulticharged phthalocyaninessalmon sperm DNAselectivitytelomerase inhibition

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Area of Science:

  • Biochemistry
  • Medicinal Chemistry
  • Molecular Biology

Background:

  • Telomerase inhibition is a key strategy in cancer therapy due to its role in cancer cell proliferation.
  • G-Quadruplex DNA structures are targets for telomerase inhibitors.
  • Ligand selectivity for G-Quadruplex over duplex DNA is essential for therapeutic efficacy.

Purpose of the Study:

  • To evaluate multicharged phthalocyanines as potential G-Quadruplex stabilizing ligands.
  • To determine the influence of charge number and position on ligand selectivity for G-Quadruplex DNA.
  • To assess the cellular uptake and localization of promising ligands in cancer cells.

Main Methods:

  • Spectroscopic techniques including UV-Vis, fluorescence, and circular dichroism were employed.
  • A series of multicharged phthalocyanines with varying positive charges were synthesized and tested.
  • Cellular accumulation studies were performed using UM-UC-3 bladder cancer cells.

Main Results:

  • Phthalocyanine charge balance (number and position) is critical for G-Quadruplex selectivity.
  • Two phthalocyanines, ZnPc1 (4 peripheral charges) and ZnPc4 (8 less exposed charges), demonstrated high selectivity for G-Quadruplex over duplex DNA.
  • Selected phthalocyanines successfully accumulated in the nucleus of UM-UC-3 bladder cancer cells.

Conclusions:

  • Optimized phthalocyanine structures can achieve high selectivity for G-Quadruplex DNA.
  • These selective ligands hold potential as anticancer agents targeting telomerase.
  • Nuclear accumulation in cancer cells suggests therapeutic relevance.