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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Purification of a gelatin-degrading type IV collagenase secreted by ras oncogene-transformed fibroblasts.

Connective tissue matrix-degrading metalloproteinases play an important role in cancer invasion. In this report we describe the isolation of a metalloproteinase exhibiting both type IV collagenolytic and gelatinolytic activities from the conditioned medium of NIH-3T3 fibroblasts transformed with DNA containing an activated c-Harvey-ras oncogene from T24 bladder cancer cells. This tumor proteinase was purified by anion exchange chromatography, zinc-chelate Sepharose chromatography, and gel permeation chromatography. The final product was homogeneous on sodium dodecyl sulfate-polyacrylamide gel electrophoresis (relative molecular mass = 67,000). Gelatin zymography revealed two bands of gelatinolytic activity, corresponding to molecular weights of 67,000 and 62,000. Upon immunoblotting with the use of an affinity-purified polyclonal rabbit antibody to a peptide region of type IV collagenase that lacks homology with interstitial collagenase or stromelysin, the purified tumor enzyme was identified as type IV collagenase.[1]


  1. Purification of a gelatin-degrading type IV collagenase secreted by ras oncogene-transformed fibroblasts. Spinucci, C., Zucker, S., Wieman, J.M., Lysik, R.M., Imhof, B., Ramamurthy, N., Liotta, L.A., Nagase, H. J. Natl. Cancer Inst. (1988) [Pubmed]
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