In vivo real-time imaging of chemotherapy response on the liver metastatic tumor microenvironment using multiphoton microscopy.

Abstract:

:In vivo real-time visualization of chemotherapy response at the cellular level provides us with direct evidence of what happens on the tumor microenvironment of metastatic organs. We imaged the response of metastatic tumor cells and host stromal cells to chemotherapeutics on liver metastatic xenografts in living mice using intravital two-photon laser scanning microscopy (TPLSM). Red fluorescent protein-expressing human colorectal cancer cells (HT29) was inoculated to the spleen of green fluorescent protein-expressing nude mice. 5-Fluorouracil or irinotecan was intraperitoneally administered after the formation of macroscopic liver metastases. Intravital TPLSM was performed at multiple time-points for time-series imaging of liver metastatic xenografts in the same mice. Under the 1st TPLSM, HT29 cells were visualized in hepatic sinusoids at the single cell level. Liver metastatic nodules consisting of viable cancer cells and surrounding stroma with tumor vessels were visualized under the 2nd TPLSM. After chemotherapy, tumor cell fragmentation, condensation, swelling and intracellular vacuoles were observed under the 3rd TPLSM. There was no obvious morphological difference in tumor response between these chemotherapeutics. Time-series intravital TPLSM imaging on the metastatic tumor xenografts may be useful for screening and evaluating new chemotherapeutics with less interindividual variability.

journal_name

Oncol Rep

journal_title

Oncology reports

authors

Tanaka K,Okigami M,Toiyama Y,Morimoto Y,Matsushita K,Kawamura M,Hashimoto K,Saigusa S,Okugawa Y,Inoue Y,Uchida K,Araki T,Mohri Y,Mizoguchi A,Kusunoki M

doi

10.3892/or.2012.1983

subject

Has Abstract

pub_date

2012-11-01 00:00:00

pages

1822-30

issue

5

eissn

1021-335X

issn

1791-2431

journal_volume

28

pub_type

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