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Imaging methods and compositions comprising fluorescent dyes associated with viral components for nerve imaging

a technology of fluorescent dyes and nerve imaging, applied in the field of medical imaging, can solve the problems of reducing affecting the survival rate of patients, so as to reduce the risk of iatrogenic injury

Inactive Publication Date: 2012-03-29
NOVADAQ TECH ULC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0018]allowing the fluorescent dye to be bound to the viral component to form a dye / viral component complex that is capable of penetrating nerve cells.
[0020]Accordingly, another embodiment provides a method for reducing the risk of iatrogenic injury to a subject during a surgical procedure, comprising:

Problems solved by technology

Iatrogenic nerve injury can result in debilitating loss of function in humans.
A significant percentage of men undergoing radical prostatectomy procedures become impotent due to injury to the cavernous nerves during the surgery.
Successful nerve sparing surgery, however, is often difficult to achieve because of the difficulty in distinguishing between the prostate tissue and the innervating nerve tissue.

Method used

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  • Imaging methods and compositions comprising fluorescent dyes associated with viral components for nerve imaging
  • Imaging methods and compositions comprising fluorescent dyes associated with viral components for nerve imaging
  • Imaging methods and compositions comprising fluorescent dyes associated with viral components for nerve imaging

Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of Virus Mutants

[0145]The HSV-2 ΔRR mutant can be prepared as described in Laing, J. et al., Intranasal administration of the growth compromised HSV-2 vector ΔRR prevents kainate induced seizures and neuronal loss in rats and mice, Mol. Ther. 2006 May; 13(5): 870-881, and in Peng et al., Virology 216:184 1996.

example 2

Preparation of Compositions

[0146]Two stock solutions were prepared:

[0147](1) ICG stock solution: 25 mg ICG in 0.8 ml H2O

[0148](2) HSV-2 ΔRR virus stock solution: 107 pfu in 20 μl phosphate buffered saline (PBS).

[0149]20 μL of the virus stock solution was combined with 20 μL ICG stock solution and kept for 1 hr at 4° C. (ICG / PBS / HSV-2 ΔRR mixture).

example 3

Animal Study

[0150]Example 3 is a comparison of imaging with a fluorescent dye alone versus a fluorescent dye bound to the virus. Unless otherwise specified, all images are digital images obtained from a CCD camera.

[0151]A mouse (60 g) was briefly anesthetized by halothane inhalation. The right footpad of the mouse was injected with 10 μL of ICG, phosphate buffered saline (PBS) and a virus mutant, HSV-2 ΔRR (“ICG / PBS / HSV-2 ΔRR mixture”). The left footpad was injected with 10 μl of ICG / PBS mixture as a control. The same concentration of ICG was present in both mixtures.

[0152]2 hours after footpad injections, the mouse was anesthetized and then euthanized with interperitoneal injection of sodium pentobarbital. ICG fluorescence images were acquired first of the intact mouse and then at various stages of dissection.

Results

[0153]FIG. 3A is a fluorescence image of the back of the mouse of Example 3 with the spine and back muscles exposed. The left foot fluorescence, with ICG alone injected...

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Abstract

Disclosed herein are compositions and methods for imaging nerve cells. The composition comprises a fluorescent dye; and a viral component selected from a neurotropic, replication-defective virus, a viral protein of a neurotropic virus, and a capsid of a neurotropic virus. Although the fluorescent dye in itself cannot penetrate nerve cells, the fluorescent dye is bound to the viral component to form a dye / viral component complex that is capable of penetrating nerve cells.

Description

RELATED APPLICATION[0001]This application claims the benefit of priority under 35 U.S.C. §119(e) to U.S. Prov. App. No. 61 / 127,659, filed May 14, 2008, and U.S. Prov. App. No. 61 / 082,981, filed Jul. 23, 2008, the disclosures of which are incorporated herein by reference.FIELD OF THE INVENTION[0002]Disclosed herein are compositions and methods relating to the field of medical imaging.BACKGROUND OF THE INVENTION[0003]Iatrogenic nerve injury can result in debilitating loss of function in humans. Common causes of iatrogenic nerve injury include surgical failure, traction or pressure lesions, hematoma, or inadequate positioning of the patient (Fercan Komurcu, MD et al., 2005, Annals of Plastic Surgery, 54(2):135-139).[0004]For example, nerves are often imaged during prostatectomy procedures. By way of background, prostate cancer is the most common type of cancer in American men. One common treatment option is removal of cancerous prostate tissue (i.e., prostatectomy) before the cancer sp...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61B6/00C12N7/00A61K35/76A61K35/763
CPCA61K47/48776A61K49/0021A61K49/0034A61K49/0097A61K49/0043A61K49/0045A61K49/0041A61K35/763A61K35/76A61K47/6901A61K47/50A61K39/245A61K49/00A61K49/0056
Inventor FLOWER, ROBERT W.
Owner NOVADAQ TECH ULC
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