Electron Paramagnetic Resonance Imaging-Solo and Orchestra

Elas, Martyna; Krzykawska-Serda, Martyna; Gonet, Michał; Kozińska, Anna; Płonka, Przemysław M.

doi:10.1007/978-981-13-9121-7_1

Cited by 1 publication

(1 citation statement)

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“…One of the strategies involves spatial imaging using soluble probes injected into the animal [ 22 – 24 ]. Another option involves using particulate probes, e.g., LiPC, which enables repetitive pO 2 readings from the exact location in the tissue [ 25 – 27 ]. This approach was used clinically in pO 2 measurements in the skin of diabetic patient legs [ 21 , 28 ] and in cancer patients [ 29 ].…”

Section: Introductionmentioning

confidence: 99%

Oxygen therapeutic window induced by myo-inositol trispyrophosphate (ITPP)–Local pO2 study in murine tumors

et al. 2023

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Hypoxia, an inevitable feature of locally advanced solid tumors, has been known as an adverse prognostic factor, a driver of an aggressive phenotype, and an unfavorable factor in therapies. Myo-inositol trispyrophosphate (ITPP) is a hemoglobin modifier known to both increase O2 release and normalize microvasculature. Our goal was to measure the tumor oxygen partial pressure dynamic changes and timing of the therapeutic window after ITPP systemic administration. Two syngeneic tumor models in mice, B16 melanoma and 4T1 breast carcinoma, were used, with varying ITPP dose schedules. Tissue oxygenation level was measured over several days in situ in live animals by Electron Paramagnetic Resonance oximetry with implanted OxyChip used as a constant sensor of the local pO2 value. Both B16 and 4T1 tumors became more normoxic after ITPP treatment, with pO2 levels elevated by 10–20 mm Hg compared to the control. The increase in pO2 was either transient or sustained, and the underlying mechanism relied on shifting hypoxic tumor areas to normoxia. The effect depended on ITPP delivery intervals regarding the tumor type and growth rate. Moreover, hypoxic tumors before treatment responded better than normoxic ones. In conclusion, the ITPP-generated oxygen therapeutic window may be valuable for anti-tumor therapies requiring oxygen, such as radio-, photo- or immunotherapy. Furthermore, such a combinatory treatment can be especially beneficial for hypoxic tumors.

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