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US 6,146,626 AGranted
Defined enzyme mixtures for obtaining cells and treating wounds
AssigneeKnoll, Inc.
InventorsClaus Otto Markert, Hans Thom, Jurgen Weymann, Wolfgang Zahn
Life of this patent
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Abstract
The invention relates to the use of mixtures of defined composition of purified enzymes from Clostridium histolyticum for obtaining, in a reproducible, standardized manner, cells or tissue fragments from human or animal tissues, and to these enzymes and mixtures thereof; in addition it relates to the direct or indirect medical use of these enzymes, alone or as ingredient of mixtures, eg. in wound treatment.
Claims5
An enzyme mixture obtainable from Clostridium histolyticum, which comprises
- a) a collagenase which has a specific activity of at least 20 U/mg in the assay of Nordwig and Strauch with the synthetic hexapeptide Z-Gly-Pro-Gly-Gly-Pro-Ala a s substrate, which is able to convert denatured collagens, to only a small extent but attacks bovine tendon collagen, whose molecular weight determined by SDS gel electrophoresis is 106,000 Da, and which has an isoelectric point at pH 5.8 to 6.0,
- b) a collagenase which has a specific activity of at least 10 U/mg in the assay of Mandl et al., using azocoll as substrate, which can efficiently convert denatured collagens, but also bovine tendon collagen, but is not able to attach small synthetic proteins whose molecular weight determined by SDS gel electrophoresis is 110,000 Da, and which has an isoelectric point at pH 5.9 to 6.1, and
- c) elastase which has a specific activity of at least 2 U/mg in the assay with elastin from bovine neck ligament as substrate and whose molecular weight determined by SDS electrophoresis is 35,000 Da.
Dependencies are inferred from the claim text.