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Methods For Selectively Modulating Survivin Apoptosis Pathways

a survivin apoptosis and pathway technology, applied in the field of selective modulation of survivin apoptosis pathways, can solve the problems of re-expression of survivin in neoplasia, abnormally prolonged cell viability, and daughter cells being different from each other, and almost certainly flawed

Inactive Publication Date: 2011-06-30
ALTIERI DARIO C
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is based on the discovery that survivin is a protein that is essential for cell viability during mitosis. The invention provides methods for identifying agents that can modulate the phosphorylation of survivin and the interactions between survivin and other proteins involved in cell fate decisions. The invention also provides survivin antagonists that can inhibit tumor growth in vivo and in vitro. Overall, the invention provides new tools for research and potential therapies for cancer and other diseases.

Problems solved by technology

Aberrations of this survivin-associated developmental pathway may result in prominent re-expression of survivin in neoplasia and abnormally prolonged cell viability (Adida et al., 1998).
If either of these steps are performed inaccurately, the daughter cells will be different from each other and will almost certainly be flawed.

Method used

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  • Methods For Selectively Modulating Survivin Apoptosis Pathways
  • Methods For Selectively Modulating Survivin Apoptosis Pathways
  • Methods For Selectively Modulating Survivin Apoptosis Pathways

Examples

Experimental program
Comparison scheme
Effect test

example 1

Phosphorylation of Survivin

[0156]A. Phosphorylation of Survivin on Thr34 by p34cdc2-cyclin B1.

[0157]Inspection of the primary sequence of survivin revealed a potential phosphorylation site for p34cdc2 at Thr34(FIG. 1A). By Clustal alignment, the region T34-P-E-R, which matched the p34cdc2 consensus phosphorylation sequence S / T-P-X-R (Holmes and Solomon, 1996), was found only in human and mouse survivin, and was absent in IAP proteins from various species (FIG. 1A and Deveraux and Reed, 1999). In in vitro kinase assays, baculovirus-expressed p34cdc2-cyclin B1 readily phosphorylated recombinant wild type survivin, whereas substitution of Thr34→Ala, i.e. survivin (T34A), abolished phosphorylation by p34cdc2-cyclin B1 (FIG. 1B). In control experiments, baculovirus-expressed Cdk2-cyclin E did not phosphorylate wild type survivin or survivin (T34A), whereas p34′2-cyclin B1 or Cdk2-cyclin E readily phosphorylated histone H1 (FIG. 1B). A rabbit antibody (ATCC No. ______) was raised against ...

example 2

Survivin Regulation of Apoptosis

[0160]A. Spontaneous Apoptosis Induced by Expression of Non-Phosphorylatable Survivin (T34A).

[0161]Transfection of HeLa cells with survivin (T34A) fused to a Green Fluorescent Protein (GFP) caused spontaneous chromatin condensation and DNA fragmentation in ˜80% of GFP-expressing cells, in the absence of exogenous apoptotic stimuli (FIG. 3A, B). Similar results were obtained with transfection of GFP-caspase-9 (Met1)-Asp330, whereas expression of GFP vector or wild type survivin did not affect nuclear morphology in HeLa cells (FIG. 3A, B). Comparable expression of the various constructs in HeLa cells was confirmed by flow cytometry by gating on the GFP-expressing population (not shown). In other experiments, expression of GFP-survivin (T34A) resulted in the appearance of HeLa cells with hypodiploid (sub-G1) DNA content by propidium iodide staining and flow cytometry, in a reaction reversed by the broad-spectrum caspase inhibitor, Z-VAD-fink (FIG. 3C). I...

example 3

Survivin and Capspase-9

[0165]Phosphorylation-Dependent Modulation of Survivin-Caspase-9 Interaction

[0166]A potential association of survivin with target caspase(s) at mitosis was investigated. Immunoprecipitates of HA-survivin or HA-survivin (T34A) from viable HeLa cells 24 h-after transfection revealed the presence of associated ˜46 kDa proform caspase-9, by Western blotting (FIG. 5A). In contrast, immunoprecipitates of wild type survivin or survivin (T34A) did not contain another upstream initiator caspase, caspase-8, by Western blotting (FIG. 5B). Co-immunoprecipitation and Western blotting experiments were repeated from adherent or non-adherent, i.e. mitotic / apoptotic, HeLa cells 48-h after transfection. As shown in FIG. 5C, HA-survivin immunoprecipitates from adherent or non-adherent HeLa cell extracts revealed the presence of associated ˜35 kDa active caspase-9, by Western blotting (FIG. 5C). Analysis of the supernatants from these immunoprecipitates revealed a predominant 46 ...

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Abstract

The present invention, based on the discovery of a new biological phenomena, provides methods and compositions for use in identifying agents that modulate the phosphorylation of survivin, the interaction between survivin and p34cdc2-cyclin B1 kinase complex, and the interaction between survivin and caspase-9. Related methods and compositions can be used to modulate survivin regulated apoptosis.

Description

RELATED APPLICATIONS[0001]This application is related to provisional application Ser. No. 60 / 080,288, filed Apr. 1, 1998, International Application PCT / US99 / 07205, filed Apr. 1, 1999, application Ser. No. 09 / 283,144, filed Apr. 1, 1999, provisional application Ser. No. 60 / 031,435, filed Nov. 20, 1996, application Ser. No. 08 / 975,080, filed Nov. 20, 1997 and International Application PCT / US97 / 21880, filed Nov. 20, 1997, all of which are herein incorporated by reference in their entirety.ACKNOWLEDGMENT OF FEDERAL SUPPORT[0002]The research and discoveries described herein were supported by grants HL 43773 and HL 54131 from the National Institutes of Health.TECHNICAL FIELD[0003]The present invention, based on the discovery of a new biological phenomena, provides methods and compositions for use in identifying agents that modulate the phosphorylation of survivin, the interaction between survivin and p34cdc2cyclin B1 kinase complex, and the interaction between survivin and caspase-9. Rela...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61K31/7088C12N5/09A61P35/00A61K31/711A61K38/00A61K45/00A61K48/00A61P43/00C07K16/18C12N1/00C12Q1/02C12Q1/48G01N33/15G01N33/50G01N33/53G01N33/573
CPCC07K16/18G01N2500/00G01N33/5011C12Q1/485A61P35/00A61P43/00
Inventor ALTIERI, DARIO C.
Owner ALTIERI DARIO C
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