Abstract
Purpose
To investigate the effect of intratumoral administration of collagenase-2 on liposomal drug accumulation and diffusion in solid tumor xenografts.
Methods
Correlation between tumor interstitial fluid pressure (IFP) and tumor physiological properties (size and vessel fraction by B-mode and Doppler ultrasound, respectively) was determined. IFP response to intravenous or intratumoral collagenase-2 (0.1%) treatment was compared with intratumoral deactivated collagenase-2. To evaluate drug accumulation and diffusion, technetium-99 m-(99mTc)-liposomal doxorubicin (Doxil™) was intravenously injected after collagenase-2 (0.1 and 0.5%, respectively) treatment, and planar scintigraphic images acquired and percentage of the injected dose per gram tissue calculated. Subsequently, tumors were subjected to autoradiography and histopathology.
Results
IFP in two-week-old head and neck squamous cell carcinoma xenografts was 18 ± 3.7 mmHg and not correlated to the tumor size but had reverse correlation with the vessel fraction (r = −0.91, P < 0.01). Intravenous and intratumoral collagenase-2 use reduced IFP by a maximum of 35–40%. Compared to the control, the low IFP level achieved through intratumoral route remained for a long period (24 vs. 2 h, P < 0.05). SPECT images and autoradiography showed significantly higher 99mTc-Doxil™ accumulation in tumors with intratumoral collagenase-2 treatment, confirmed by %ID/g in tumors (P < 0.05), and pathological findings showed extensive distribution of Doxil™ in tumors.
Conclusions
Intratumoral injection of collagenase-2 could effectively reduce IFP in HNSCC xenografts for a longer period than using intravenous approach, which allowed for more efficient accumulation and homogeneous diffusion of the Doxil™ within the tumor interstitium.
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Acknowledgments
Microscopic images were generated in the Core Optical Imaging Facility, which is supported by UTHSCSA, NIH-NCI P30 CA54174 (San Antonio Cancer Institute), NIH-NIA P30 AG013319 (Nathan Shock Center), and (NIH-NIA P01AG19316). Pilot Grant from Radiology Department, The University of Texas Health Science Center at San Antonio.
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Zheng, X., Goins, B.A., Cameron, I.L. et al. Ultrasound-guided intratumoral administration of collagenase-2 improved liposome drug accumulation in solid tumor xenografts. Cancer Chemother Pharmacol 67, 173–182 (2011). https://doi.org/10.1007/s00280-010-1305-1
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DOI: https://doi.org/10.1007/s00280-010-1305-1