Pyrroloquinoline quinone drugs for treatement of cardiac injury and methods of use thereof

a technology of pyrroloquinoline and quinone, which is applied in the direction of drug composition, biocide, anti-noxious agents, etc., can solve the problems of several tissue injuries, achieve the effects of reducing the risk of tissue injury

Inactive Publication Date: 2008-09-11
CLF MEDICAL TECH ACCELERATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0004]The present invention relates to the discovery that myocardial oxidative stress can be prevented or minimized by administration of certain cardioprotective factors, and thus has benefit for treating cardiovascular and other diseases. In particular, it has been found that non-toxic dosages of pyrroloquinoline quinone (“PQQ”) drugs are useful as cardioprotective agents, and are therefore valuable in the treatment of a variety of various heart-related ailments such as ischemia-reperfusion injury, congestive heart failure, cardiac arrest and myocardial infarction such as due to coronary artery blockage, and for cardioprotection. PQQ in particular has been found to modulate myocardial oxidative stress such that myocardial cells (which are the subject of the oxidative stress) are protected from cell death.
[0009]In another aspect of the invention, PQQ has been found to modulate free radical damage caused by myocardial oxidative stress. Free radicals generated by ischemic or hypoxic conditions have been found to be a significant cause of myocardial damage leading to myocardial death. As such, administration of PQQ, administered in vivo in non-toxic dosages, is an effective treatment for inhibiting or preventing myocardial oxidative stress free radical damage.

Problems solved by technology

Reperfusion, although generally considered beneficial, causes tissue injury by several mechanisms.

Method used

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  • Pyrroloquinoline quinone drugs for treatement of cardiac injury and methods of use thereof
  • Pyrroloquinoline quinone drugs for treatement of cardiac injury and methods of use thereof
  • Pyrroloquinoline quinone drugs for treatement of cardiac injury and methods of use thereof

Examples

Experimental program
Comparison scheme
Effect test

example 1

In Vitro Studies of PQQ Preservation of Cardiac Myocyte Viability

[0114]An in vitro model of cultured adult cardiac mouse myocytes was developed to study cardioprotection by PQQ. These cells are viable in culture for up to 48 hours at a physiologic pH and consist of >90% rod-shaped cells. These cells can be used readily for determination of cell viability by trypan blue exclusion, and for biochemical, immunochemical, and molecular studies. In this model, approximately 35% of the cells die when exposed to 0% oxygen in a hypoxia chamber for 2-3 hours. As shown in FIG. 1, 1 μM PQQ added 1 hour before subjecting the cells to severe hypoxia (0% oxygen for 2-3 hours) produces a significant increase in the proportion of viable cells as indicated by trypan blue exclusion. A higher concentration of PQQ (100 μM) is highly toxic under normoxic conditions as evidenced by 100% cell death. FIG. 2 demonstrates that 1 μM PQQ protection against hypoxia-induced cell death is not inhibited by 10 μM 5-h...

example 2

Ex Vivo Studies of PQQ Preservation of Cardiac Function

[0115]Ex vivo studies were performed using an isolated mouse heart preparation employing the Langendorff technique. In this approach, the heart is removed and mounted on a perfusion apparatus in which drugs can be given via an aortic cannula. The heart is paced at a constant rate, and left ventricular developed pressure [LVDP; left ventricular systolic pressure minus left ventricular end-diastolic pressure], left ventricular end-diastolic pressure [LVEDP], and the maximum positive and negative first derivatives of left ventricular pressure [+dP / dtmax and −dP / dtmax] are recorded. The heart is equilibrated for 20 min. After drug or vehicle is infused, the heart is subjected to 20 min of ischemia [coronary flow completely stopped] followed by 30 min of reperfusion. Coronary sinus flow as a reflection of coronary blood flow is also measured. This protocol leads to severe myocardial injury as measured by hemodynamic parameters.

[0116]...

example 3

PQQ Preservation of Oxidatively Stressed Cells

[0119]Cultured cardiac myocytes are subjected to oxidative stress by in vitro administration of H2O2. Two studies are done, one in which PQQ is added in concentrations between 10 nM and less than 10 μM to cardiac myocytes, after which H2O2 is added. In the other study, cardiac myocytes are subjected to insult in vitro administration of H2O2 for two hours, after which PQQ is added in concentrations between 10 nM and less than 10 μM. In both studies, PQQ is found to be protective.

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Abstract

The invention includes compositions comprising substantially purified pyrroloquinoline quinone, that are useful in methods for the treatment and prevention of cardiac injury caused by hypoxia or ischemia. The invention also includes methods for the treatment and prevention of cardiac injury comprising contacting a composition of the invention with a human patient.

Description

[0001]This application claims priority to and is a divisional application of U.S. Ser. No. 10 / 146,566, filed May 15, 2002, which is now U.S. Pat. No. 7,276,514, the contents of which are incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]The heart is critically dependent on uninterrupted blood flow for the delivery of oxygen and nutrients and the removal of harmful products of metabolism. Ischemia leads to rapid changes in myocardial metabolism and cellular injury, the extent of the injury being dependent upon the severity of ischemia. Continued ischemia leads to total tissue necrosis in a few hours.[0003]Reperfusion, although generally considered beneficial, causes tissue injury by several mechanisms. Clinically, in open heart surgery, heart transplantation, and reversal of heart disease, protection of the myocardium against injury by ischemia-reperfusion is an issue of utmost clinical interest. Further, exacerbation of hypoxic injury after restoration of oxygenation...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61K31/4745A01N1/02C07D471/04A61K31/4725A61K45/00A61P9/00A61P9/04A61P9/10A61P25/06A61P39/06A61P43/00
CPCA61K31/4745A61P25/06A61P39/06A61P43/00A61P9/00A61P9/04A61P9/10Y02A50/30
Inventor DAVIS, PAUL J.
Owner CLF MEDICAL TECH ACCELERATION
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