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Analysis of microcirculation of experimental metastatic lung tumor using artificial oxygen carrier as a tool for altering the microvascular tone

Research Project

Project/Area Number 12671328
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Thoracic surgery
Research InstitutionKeio University

Principal Investigator

HORINOUCHI Hirohisa  Keio University, School of Medicine, Assistant Professor, 医学部, 講師 (60173647)

Co-Investigator(Kenkyū-buntansha) YAMAUCHI Tokuko  Keio University, School of Medicine, Instructor, 医学部, 助手 (30306732)
WATANABE Masazumi  Keio University, School of Medicine, Instructor, 医学部, 助手 (90201227)
KOBAYASHI Koichi  Keio University, School of Medicine, Professor, 医学部, 教授 (80051704)
YAMAMOTO Manabu  Keio University, School of Medicine, Instructor, 医学部, 助手 (10317159)
IWAMARU Arifumi  Keio University, School of Medicine, Instructor, 医学部, 助手 (00296592)
Project Period (FY) 2000 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥2,400,000 (Direct Cost: ¥2,400,000)
Fiscal Year 2001: ¥1,300,000 (Direct Cost: ¥1,300,000)
Fiscal Year 2000: ¥1,100,000 (Direct Cost: ¥1,100,000)
Keywordsmetastasis / lung neoplasm / pulmonary microcirculation / artificialoxygen carrier / Hemogobin-Vesicle / nitric oxide / laser confocal microscope / 腫瘍循環 / 肺微少循環
Research Abstract

The environment of metastatic tumor in the lung is much different in terms of oxygen supply and microcirculation compare to those metastatic tumors in other organs. To investigate the establishment of microcirculation of metastatic lung tumor, we have to establish syngenic model of lung metastasis.
To observe lung microcirculation, we implanted a crystal window chamber in the chest wall of a rat. Through this window, we could observe pulmonary arteriole, alveolar capillary, and pulmonary vein using laser confocal microscope and fluorescent dye. The images were recorded in VCR and analyzed afterwards. Inner diameter of vasculature could be measured and blood flow could be evaluated in capillary area. More sophistication was necessary to measure the blood flow in pulmonary arteriole because flow was fast enough to capture individual fluorescent labeled red blood cells. To establish lung metastasis, we evaluated 5 models using LY80 which is ascitis hepatoma in Donryu rat. Examined modaliti … More es were as follows, intraperitoneal tumor cell injection, subcutaneous implantation of tumor cells, implantation of tumor cells to the lung directly by thoracotomy, tail vein infusion of tumor cells, and tail vein infusion of small tissue suspension taken from subcutaneous implanted tumor. Among these modalities, tail vein infusion of small tissue suspension taken form subcutaneous implanted tumor gave us the most reliable and stable results. After 15 to 17 days after infusion, we could evaluate the pulmonary metastatic tumor.
To evaluate the reactivity of tumor microvasculature, we used oxyhemoglobin solution and HbV suspension. Oxyhemoglobin solution is a strong potential of contraction of microvasculature, while HbV (liposome encapsulated hemoglobin), which is originally developed as an artificial oxygen carrier, is thought to have little effect on microvasculature. In normal animals, pulmonary arterioles contract after injection of Oxyhemoglobin while transient contraction was observed after HbV injection. There are little change of diameter, flow in alveolar capillary. However, pulmonary arteriole react these challenges revealing that Nitric Oxide is one of major modulator in determining the tone of pulmonary vasculature.
In tumor burden animals, especially in current model, alveolar capillary was dilated. But we could not observe any changes in arteriole and/or venule area. The effect of oxyhemoglobin and HbV in this model is similar to those observed in intact animals. We have to improve the model to analyze the event in microcirculation of metastatic lung tumor. Less

Report

(3 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • Research Products

    (2 results)

All Other

All Publications (2 results)

  • [Publications] Iwamaru A, Yu S, Ohtsuka T, Watanabe M, Horinouchi H, Kobayahi: "Measurement of tumor blood flow using dye extraction microspheres in two rat tumor models"Int J Oncol. 18. 227-232 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Iwamaru A, Watanabe M, Yu S, Ohtsuka T, Horinouchi H, Kobayashi K: "Measurement of tumor blood flow using dye extraction microspheres in two rat tumor models"Int J Oncol. 18. 227-232 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary

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Published: 2000-04-01   Modified: 2016-04-21  

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