Ultrasound-guided intratumoral administration of collagenase-2 improved liposome drug accumulation in solid tumor xenografts

Xiangpeng Zheng, Beth A. Goins, Ivan L. Cameron, Cristina Santoyo, Ande Bao, Victoria C. Frohlich, Gary D. Fullerton

Research output: Contribution to journalArticlepeer-review

26 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)173-182
Number of pages10
JournalCancer chemotherapy and pharmacology
Issue number1
StatePublished - Jan 2011


  • Collagenase
  • Drug delivery
  • Interstitial fluid pressure
  • Liposome
  • Solid tumor

ASJC Scopus subject areas

  • Oncology
  • Toxicology
  • Pharmacology
  • Cancer Research
  • Pharmacology (medical)


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