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Microdistributions of prospective BNCT-compound CuTCPH in tissue sections with a heavy ion microbeam
P Stoliar1, A J Kreiner, M E Debray
1Departamento de Física, Argentine Atomic Energy Commission, CNEA, Av. Gral. Paz 1499, CP 1650, Bienos Aires, Villa Martelli, Argentina.
Abstract:
Microdistributions of the prospective BNCT-compound CuTCPH, a carborane-containing tetraphenylporphyrin with one Cu atom in its molecular structure, have been obtained in tissue sections of different organs of tumor-bearing and normal Syrian hamsters injected with the boron compound by employing a heavy ion microbeam. High resolution X-ray spectroscopy following micro-PIXE (Particle Induced X-ray Emission with micrometer-sized beams) with a focused (16)O ion beam was used. Focusing was performed with a heavy-ion scanning high-precision magnetic quadrupole triplet microprobe. Squamous Cell Carcinomas were induced on the right Cheek Pouch of Syrian Hamsters (HCP), sampled, cryo-sectioned and freeze-dried. Two-dimensional maps of elemental concentration were obtained by scanning the beam over the samples. Very non-uniform Cu concentrations were found in all sections.
Insights
Researchers mapped the distribution of the boron compound CuTCPH in hamsters using micro-PIXE. They found highly non-uniform copper concentrations in various organs and tumor tissues, crucial for Boron Neutron Capture Therapy (BNCT) development.
Area of Science:
- Nuclear Physics
- Materials Science
- Biomedical Engineering
Background:
- Boron Neutron Capture Therapy (BNCT) is an experimental cancer treatment.
- Carborane-containing porphyrins are promising compounds for BNCT.
- Understanding the microdistribution of these compounds is crucial for treatment efficacy.
Purpose of the Study:
- To investigate the microdistributions of the prospective BNCT compound CuTCPH.
- To analyze elemental concentrations in different organs of tumor-bearing and normal Syrian hamsters.
Main Methods:
- Utilized micro-PIXE (Particle Induced X-ray Emission) with a focused 16O ion beam.
- Employed a heavy-ion scanning magnetic quadrupole triplet microprobe for high-resolution X-ray spectroscopy.
- Analyzed cryo-sectioned and freeze-dried tissue samples from Syrian hamsters with induced Squamous Cell Carcinomas.
Main Results:
- Obtained two-dimensional elemental concentration maps by scanning the microbeam over tissue sections.
- Revealed very non-uniform copper (Cu) concentrations in all analyzed tissue sections.
- Demonstrated significant variations in Cu distribution within different organs and tumor tissues.
Conclusions:
- The microdistribution of CuTCPH is highly heterogeneous in both normal and tumor tissues.
- These findings highlight the importance of microdistribution analysis for optimizing BNCT compound delivery.
- Further research is needed to understand factors influencing CuTCPH accumulation and distribution for improved therapeutic outcomes.
