DNA-BASED HYBRID LIQUID CRYSTALLINE NANO ORGANOMETALLIC COMPOSITES FOR TARGETED DRUG DELIVERY IN NEUTRON CAPTURE THERAPY

Objective: The aim of this work was focused on the obtaining a DNA-based hybrid nano liquid crystalline organometallic composites for targeted drug delivery in neutron capture therapy.Methods: The formation of a cholesteric liquid crystalline DNA (CLCD-DNA) dispersion has performed using ultrasonic depolymerized calf thymus DNA(MW-0.6-0.8×106Da)2×10-7M, mixing with polyethylene glycol8.5×10-5M, dissolved in the 0.3 M NaCl solution and incubated over 1,0 h at 20 °C. CLCD-DNA formation process was determined and controlled by measuring absorption value of circular dichroism (CD) spectrum in the range of 350-600 nm. The organometallic DNA-Gd compound was formed by processing the obtained CLCD-DNA with 2.49 × 10-4M, 4.97 × 10-4M, 9.8 × 10-4 M, 1.48× 10-3M, 2.92 × 10-3M GdCl3 aqueous solutions. CLCD-DNA-gadolinium complex formation process was registered over the appearance of 2nd amplitude in the CD spectrum. DNA-Gd complex dispersion toxicity was evaluated over 40 min, 24h and 72h incubation with 1×106cells in the RPMI-40 medium supplemented with 3×10-4 M Gd3+.Results: The obtained CLCD-DNA-Gd (d~500 nm) particles was shown less toxicity and higher viability percentage of macrophages after 40 min incubation with CLCD-DNA-Gd contains Gd3+ions concentration 3×10-4 M showed 100% viability and after 72 h ours approximately 89%. The cells immobilized with CLCD-DNA-Gd particles contains 3×10-4M Gd3+, neutron irritation was caused a 100% cell deaths.Conclusion: Obtained relatively stable, non-cytotoxic drug forms with a maximum local concentration of gadolinium (400 µg/ml). The effectiveness of these nanosystems for targeted drug delivery has markedly superior efficacy than 10B and other products were based on gadolinium.