Method for improving respiratory function and inhibiting muscular degeneration

a technology of respiratory function and muscle degeneration, applied in the field of respiratory function improvement and muscle degeneration inhibition, can solve the problems of respiratory failure, respiratory function abnormalities, and respiratory failure, and achieve the effects of improving respiratory function, inhibiting muscular degeneration, and improving respiratory function

Inactive Publication Date: 2006-11-16
TENG YANG D
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0005] The present invention provides a method for improving respiratory function and inhibiting muscular degeneration (e.g., dystrophy and atrophy). Alternative embodiments of the invention provide a method of inhibiting motor neuron apoptosis and the subsequent muscular degeneration associated with the denervation of muscular tissue resulting from neuron death. The methods provided herein can be used to improve the respiratory function of individuals who have abnormal respiratory function either as a consequence of a spinal cord injury or amyotrophic lateral sclerosis.

Problems solved by technology

Furthermore, abnormalities of respiratory function and failure of the respiratory system are leading causes of mortality in the late stages of amylotrophic lateral sclerosis (ALS).
The progressive muscular degeneration results in deficits in somatomotor function and speech and eventually is manifest as respiratory failure.
To date, SCI- and ALS-induced respiratory abnormalities have been neither successfully managed or treated due to a lack of effective therapeutic agents.

Method used

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  • Method for improving respiratory function and inhibiting muscular degeneration
  • Method for improving respiratory function and inhibiting muscular degeneration
  • Method for improving respiratory function and inhibiting muscular degeneration

Examples

Experimental program
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Effect test

example 1

Treatment with the Serotonin 1A Receptor (5HT1A) Agonist 8-OH-DPAT Improves Respiratory Function in Spinal Cord Injured Rats

[0041] Respiratory function was evaluated when rats were breathing room air for the data baseline respiration. In addition, rats were challenged with air mixtures containing 7% CO2, as described in Methods. This was done to determine the effect of SCI on the central chemoreceptor-mediated respiratory responses to high concentration of CO2.

[0042] Twenty-four hours after we examined respiratory function in rats prior to injury to establish normal parameters, rats were subjected to SCI. At 24 hours p.i. and 7 days p.i., all SCI rats were tested behaviorally for their hindlimb reflexes and coordinated use of hindlimbs, including a detailed examination of open field locomotion (Gale et al., 1985; Basso et al., 1995; Wrathall et al., 1994; Teng and Wrathall, 1997). We found that behavioral deficits proper to this degree of SCI as well as post-injury time points (i....

example 2

Time-Course Study of the Effects of 8-OH-DPAT on minute Ventilation (Ve)

[0045] Considering the relative short systematic half life of 8-OH-DPAT in rats (T1 / 2: ˜50 minutes; Kleven and Koek, 1998), we decided to conduct a time-course study to determine if the respiratory effects of 8-OH-DPAT was time-related and thus, a dose-dependent event. At 24 hours p.i., the enhancing effect of 8-OH-DPAT on ventilatory response to 7% CO2 challenge decreased in a time-dependent manner, with the values recorded at 5 hours after the drug injection being slightly and not significantly higher than those collected at 24 hours p.i. and before 8-OH-DPAT treatment (FIG. 3). Therefore, a single dose treatment of 8-OH-DPAT normalized ventilatory response to breathing 7% CO2 for more than 2 hours after the drug administration (FIG. 3). Interestingly, although 8-OH-DPAT-treatment also showed a time-dependent improvement of baseline Ve (i.e. under room air breathing), however, the effect was significant for o...

example 3

Effects of 8-OH-DPAT on the Respiratory Function of Normal Rats

[0046] Normal rats without SCI demonstrated highly consistent respiratory parameters under baseline conditions and 7% CO2 challenge relative to data collected at 24 hours pre-injury in the above SCI studies (compare Table 2 to Table 1) as well as to those reported earlier by our group (Teng et al., 1998a and 1999). Saline VEH injection (0.5 ml / per rat, i.p.) did not change respiratory parameters either in baseline conditions or under 7% CO2 breathing compared to those obtained before VEH treatment (Table 2). In contrast, treatment of 8-OH-DPAT quickly and significantly enhanced respiratory function (Table 2). However, 8-OH-DPAT treatment only increased baseline Vt for 4 minutes in normal rats before it dropped back to previous levels (Table 2). On the other hand, the stimulating effect of 8-OH-DPAT on f lasted till the last minute of the observation (i.e. 23 minutes post drug administration) and with a strong potency (T...

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Abstract

The present invention provides a method for improving respiratory function and inhibiting muscular degeneration (e.g., dystrophy and atrophy). Alternative embodiments of the invention provide a method of inhibiting motor neuron apoptosis and the subsequent muscular degeneration associated with the denervation of muscular tissue resulting from neuron death.

Description

RELATED APPLICATIONS [0001] This application is a continuation of U.S. application Ser. No. 10 / 244,087, filed Sep. 13, 2002, which is a continuation of PCT Application Serial No. PCT / US01 / 40291, filed Mar. 14, 2001, which claims the benefit of U.S. Provisional Application Ser. No. 60 / 189,241, filed Mar. 14, 2000, the entire teachings of which are incorporated herein by reference.GOVERNMENT SUPPORT [0002] The invention was supported, in whole or in part, by grants PO1-NS-28130 and RO1-NS-35647 from the National Institute for Health. The Government has certain rights in the invention.BACKGROUND OF THE INVENTION [0003] It is well known that pulmonary pathophysiology is one of the most significant factors associated with the morbidity and mortality of individuals afflicted with either acute or chronic spinal cord injuries (SCI). Furthermore, abnormalities of respiratory function and failure of the respiratory system are leading causes of mortality in the late stages of amylotrophic late...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61K31/506A61K31/137A61K45/06
CPCA61K31/137A61K31/506A61K45/06A61K2300/00
Inventor TENG, YANG D.
Owner TENG YANG D
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