Hexokinase inhibitors
First Claim
1. A mammalian host cell comprising an inhibitor of a low Km hexokinase, the inhibitor selected from:
- (a) a trehalose-6-phosphate synthase enzyme that stimulates the production of trehalose-6-phosphate;
or(b) a ribozyme specific for an RNA transcript of a low Km hexokinase gene;
wherein said inhibitor is present in an amount effective to reduce the low Km hexokinase activity of said cell.
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Accused Products
Abstract
Disclosed are compositions and methods for inhibiting hexokinase enzymes in mammalian cells. Specifically provided are proteins that stimulate the production of trehalose-6-phosphate and their respective genes; hexokinase-specific ribozymes and genes encoding such constructs; and agents that competitively reduce hexokinase activity, e.g., by displacing hexokinase from mitochondria, and their respective genes. The latter group of agents includes inactive hexokinases and fragments thereof that retain mitochondrial binding functions and hexokinase-glucokinase chimeras that further substitute glucokinase activity for hexokinase activity. Mammalian cells including such hexokinase inhibitors, methods of making such cells and various in vitro and in vivo methods of using cells with reduced hexokinase activity are also described herein.
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Citations
64 Claims
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1. A mammalian host cell comprising an inhibitor of a low Km hexokinase, the inhibitor selected from:
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(a) a trehalose-6-phosphate synthase enzyme that stimulates the production of trehalose-6-phosphate;
or(b) a ribozyme specific for an RNA transcript of a low Km hexokinase gene; wherein said inhibitor is present in an amount effective to reduce the low Km hexokinase activity of said cell. - View Dependent Claims (2, 3, 4, 5)
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6. An engineered host cell that secretes insulin in response to glucose, the cell comprising an inhibitor of a low Km hexokinase, the inhibitor selected from:
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(a) a trehalose-6-phosphate synthase enzyme that stimulates the production of trehalose-6-phosphate;
or(b) a ribozyme specific for an RNA transcript of a low Km hexokinase gene; wherein said inhibitor is present in an amount effective to reduce the low Km hexokinase activity of said cell. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 59)
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51. An engineered mammalian host cell derived from a cell that forms secretory granules, the cell secreting insulin in response to glucose and comprising a first recombinant gene selected from the group consisting of hexokinase IV, insulin and GLUT-2 and a second recombinant gene selected from the group consisting of:
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(a) a recombinant gene that expresses a trehalose-6-phosphate synthase enzyme that stimulates the production of trehalose-6-phosphate; and (b) a recombinant gene that expresses a ribozyme specific for an RNA transcript of a low Km hexokinase gene.
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52. A composition comprising an inhibitor of a low Km hexokinase, characterized as:
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(a) a recombinant vector comprising a promoter operably linked to a gene that encodes a trehalose-6-phosphate synthase enzyme that stimulates the production of trehalose-6-phosphate, the promoter expressing said trehalose-6-phosphate synthase enzyme in a mammalian host cell;
or(b) a ribozyme specific for an RNA transcript of a low Km hexokinase gene or a recombinant gene or vector that expresses said ribozyme. - View Dependent Claims (53, 54, 55, 56, 57, 58, 60, 61, 62, 63, 64)
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Specification