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Diagnosis and treatment of neuroectodermal tumors

a neuroectodermal tumor and tumor technology, applied in the field of cell physiology, neurology, developmental biology, oncology, can solve the problems of nestin, keratin, keratin, and glioma cell antigens that have not yet been shown to be useful for diagnostic purposes, and the gene has yet to be demonstrated in glioma cells

Inactive Publication Date: 2010-08-26
UAB RES FOUND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this gene has yet to be demonstrated in the glioma cells.
However, there remains controversy in placing all primitive neuroectodermal tumors into the same categories.
Others antigens found in these tumors are vimentin, nestin, keratin but are not useful for diagnostic purposes.
It is believed that this ability is lost after cell differentiation and maturation.
The prior art is deficient in the lack of an diagnostic and therapeutic agents specifically targeted to primitive neuroectodermal tumors.

Method used

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  • Diagnosis and treatment of neuroectodermal tumors
  • Diagnosis and treatment of neuroectodermal tumors
  • Diagnosis and treatment of neuroectodermal tumors

Examples

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example 1

Summary of Chlorotoxin Results from Glioma Experiments

[0072]Recent studies demonstrated a common antigen is expressed by the vast majority of glioma cells. This antigen is targeted by chlorotoxin (Ctx or TM-601), a 36 amino acid peptide originally isolated from Leiurus quinquestriatus scorpion venom. Chlorotoxin selectively binds to the membrane of glioma cells allowing selective targeting of these cells within the CNS (18). The antigen targeted by this peptide appears to be a chloride ion channel although the antigen has not yet been unequivocally identified at the molecular level. Thus far, the data indicates that chlorotoxin binds to a membrane protein of 72 kDa molecular weight that is preferentially expressed in the cytoplasmic membrane of glioma cell. Binding of the peptide enhances glioma cell proliferation (19) and inhibits the ability of glioma cells to migrate in Transwell assays, an in vitro assay to evaluate tumor invasiveness (20). Chlorotoxin appears to exert these eff...

example 2

Immunohistochemical Staining of Gliomas with Chlorotoxin

[0073]Over 250 frozen or, paraffin sections of human biopsy tissues were histochemically stained with a chemically synthesized form of chlorotoxin containing a detectable biotin group chemically attached to the N terminus (TM-601). Binding of the TM-601molecule was observed on selective cells associated with the essentially all glioma tumors with up to 95% positive cells per tumor. Based on these studies, it has been proposed to utilize chlorotoxin a s a glioma specific marker and as a potential therapeutic tool for targeting glioma tumors. For such purposes, chlorotoxin linkage of radioactive molecules or cytotoxic moieties such as saporin could be employed.

example 3

Recombinant DNA Manipulation of Chlorotoxin

[0074]Using techniques well known in the art, one may prepare recombinant proteins specifically engineered to mimic the binding and action of the native toxin. The biological activity of the synthetic chlorotoxin is as effective for chloride ion channel blockade as the native venom toxin. Recombinant techniques are used to synthesize chlorotoxin in E coli using a modified PGEX vector system and the toxin may be linked to various fusion proteins using common restriction sites. After synthesis of recombinant chlorotoxin, it may be linked to various cytotoxic fusion proteins including glutathione-S-transferase (GST), gelonin, ricin, diptheria toxin, complement proteins and radioligands and other such proteins as are well known in the immunotoxin art.

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Abstract

The present invention provides fusion proteins for the detection and treatment of neuroectodermal tumors. Previous work demonstrated that chlorotoxin is specific for glial-derived or meningioma-derived tumor cells. The current invention has extended the use of chlorotoxin-cytotoxin fusion proteins to treat the whole class neuroectodermal tumors such as gliomas, meningiomas, ependymonas, medulloblastomas, neuroblastomas, gangliomas, pheochromocytomas, melanomas, PPNET's, small cell carcinoma of the lung, Ewing's sarcoma, and metastatic tumors in the brain. Also, diagnostic methods are provided for screening neoplastic neuroectodermal tumors.

Description

FEDERAL FUNDING LEGEND[0001]This invention was produced in part using funds from the Federal government under NIH grant no. R01 NS 36692. Accordingly, the Federal government has certain rights in this invention.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates generally to the fields of cell physiology, neurology, developmental biology, and oncology. More specifically, the present invention relates to novel methods of using a chlorotoxin sensitive cytoplasmic protein for the diagnosis and treatment of primitive neuroectodermal tumors (PNET).[0004]2. Description of the Related Art[0005]During embryonic development, the future nervous system forms from a specialized layer of ectodermal cells called the neuroectoderm. This layer extends longitudinally along the body axis congruent with the future spinal column. Invagination of the neuroectoderm gives rise to the neural tube from which essentially all central nervous system (CNS) components in...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61K51/08A61K39/395A61K38/17A61P35/00G01N33/574A61K38/00G01N33/53A61K45/00A61K47/48C07K16/28G01N33/566
CPCA61K47/48261A61K2039/505C07K16/28Y10S436/813G01N33/57492G01N2333/705G01N33/57407A61K47/6415A61P35/00
Inventor SONTHEIMER, HARALD W.LYONS, SUSAN A.
Owner UAB RES FOUND
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