J.Jpn. Surg. Soc.. 91(2): 174-183, 1990

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Original article

NEW DIRECT ASSAY METHOD OF TYPE IV COLLAGENASE IN TISSUE HOMOGENATE AND BIOCHEMICAL ROLE OF COLLAGENASE AGAINST TYPE I AND TYPE IV COLLAGENS TO THE INVASION OF STOMACH AND LUNG CANCER

In order to study the role of both collagenases against type I and type IV collagen (type I and type IV collagenase) with regard to tumor invasion and metastasis, the activities of both collagenases in tissue homogenate in each 40 cases of stomach and lung cancers were investigated.
The direct assay method of type IV collagenase in tissue was established through modification of Liotta's method.
In stomach cancer, the part of advancing front of cancer showed the highest activity of type I collagenase. The adjacent mucosa to cancer also showed high activity of type IV collagenase. The cancer tissues that had the remarkable finding of vascular invasion of cancer cells showed high activity of type IV collagenase.
In lung cancer, the correlation between the size of cancer mass and activity of type I collagenase was shown. Squamous cell carcinoma in comparison to adenocarcinoma had higher activity of type I collagenase and poor activity of type IV collagenase.
These results suggested that the activity of type I collagenase might participate in local invasion and the activity of type IV collagenase might be associated with vascular invasion of cancer through disruption of basement membrane and they could be one of the useful biochemical tumor marker to represent the growth and metastatic pattern.

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