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Dihydroouabain-like factor and diagnostic & therapeutic compositions and methods

a dihydroouabain-like factor and a technology of dh, which is applied in the field of mammalian ouabain-like factors (olf), can solve the problems of increased force and velocity of ventricular contraction, slow heart rate, and often accompanied by toxic effects that can be severe or lethal, and achieves lower potency, higher potency, and lower potency.

Inactive Publication Date: 2005-06-09
UNIV OF LOUISVILLE RES FOUND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"This patent describes a purified and isolated mammalian dihydroouabain-like factor (Dh-OLF) that inhibits the sodium pump (Na+,K+-ATPase) and is a pro-drug for the plant-derived dihydroouabain (dho). Dh-OLF has been found in biological samples and is involved in the regulation of blood pressure and kidney function. The patent also describes monoclonal and polyclonal antibodies that can detect and reduce levels of Dh-OLF and OLF in biological samples. The invention provides a method for reducing levels of Dh-OLF and OLF in subjects with elevated levels of these factors. The patent also describes a diagnostic assay for measuring the levels of Dh-OLF and OLF in biological samples. The invention has potential use as a therapeutic agent for the treatment of diseases associated with abnormal levels of Dh-OLF or OLF."

Problems solved by technology

These drugs produce an increase in the force and velocity of ventricular contraction, and also a slowing of the heart rate.
However, cardiac glycosides have narrow therapeutic indices and their use is frequently accompanied by toxic effects that can be severe or lethal.
One of the side effects of administration of cardiac glycosides is arterial hypertension.
It is thought that an excess of endogenous factors may also cause arterial hypertension, which is a risk factor in complications associated with various organs.
Although presently available antihypertensive agents have proven beneficial, they still fall short of completely reversing the effects caused by high blood pressure.
Although still uncertain, however, why increased Na+ reabsorption might lead to high blood pressure, salt retention and plasma volume expansion trigger the secretion of sodium pump inhibitors (SPIs), which restore extracellular fluid volume via natriuresis.
Whatever the mechanism, it has been empirically noted that hypertension is associated with abnormal function of sodium regulation.
The chronic administration of ouabain has been shown to cause the development of hypertension in rats.
When both reactions are conducted in the same medium, analyte present in the unknown sample interferes with the binding of known quantities of antibody to known quantities of antigen.

Method used

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  • Dihydroouabain-like factor and diagnostic & therapeutic compositions and methods

Examples

Experimental program
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example 1

Chemicals and Reagents

[0049] All chemicals used were reagent grade. 5-sulfosalicylic acid (SSA), calcium carbonate (CaCO3), digoxin, ouabain, ouabagenin, dihydroouabain, porcine cerebral cortex Na+,K+-ATPase (PCC), all reagents for catalytic inhibition of the sodium pump (adenosine 5′-triphosphate (ATP), ammonium molybdate, tween-80, bovine serum albumin (BSA), and all reagents for gel electrophoresis e.g., acrylamide, bis-acrylamide, N, N, N′, N′-tetramethyl-ethylene diamine (TEMED), Tris [Hydroxymethyl] aminomethane (TRIZMA base), sodium dodecyl sulfate (SDS), glycine, β-mercaptoethanol, bromophenol dye) except ammonium persulfate, which was purchased from Amresco (Solon, Ohio), were obtained from Sigma (St. Louis, Mo.). Digoxigenin and dihydrodigoxin were donated by Burroughs Wellcome Co. (Research Triangle Park, N.C.). Pre-stained protein markers were purchased from Bio-Rad (Richmond, Calif.). Phosphorus-32-phosphate (32 Pi, 1 mCi in 100 μL) was purchased from NEN, Life Science...

example 2

Equipment and Materials

[0050] A Polytron PT 3000 (Brinkman, Westbury, N.Y.) was used for homogenizing adrenocortical tissue and an Orion pH / SE meter model 710A (Orion, Cambridge, Mass.) for pH measurements. Solid phase extraction C-18 cartridges (Sep-Pak) were obtained from Waters Associates (Milford, Mass.). HPLC was performed on C-18 reverse-phase μ Bondapak columns (3.9×300 mm, 10-μm particle size) connected to a Waters 600E system controller and a Waters 966 photodiode array detector. Eluted fractions were collected with a Waters Fraction Collector from Millipore Corp. (Millford, Mass.) and evaporated with a Jouan Centrifugal Vacuum Concentrator RC 10.22 connected to a Jouan Refrigerated Trap RCT 60 (Winchester, Va.). For UV-spectrophotometry, we used a Hewlett-Packard (Palo Alto, Calif.) Model 8452A diode array spectrophotometer. A Beckman JA-2 centrifuge (Beckman, Palo Alto, Calif.) was used for centrifugation in the tissue preparation procedure. For sodium pump inhibition as...

example 3

Tissue Preparation

[0053] Bovine adrenal glands were obtained from Pel-Freeze Biologicals (Rogers, Ark.) or provided by a local abattoir. The cortices were separated from medulla, sliced, chopped and homogenized in 2 ml dH2O g cortex using a Polytron PT 3000 homogenizer. The homogenate was centrifuged three times at 34,000 g for 30 minutes at 4° C. after which the pellet of each centrifugation step was resuspended in dH2O (1 ml / g cortex). The proteins in the tissue homogenates were precipitated by incubating the supernatant with 1% SSA at room temperature for 60 sec with continuous stirring followed immediately by adding an excess amount of CaCO3 until the pH increased and remained at 5.2. This extract was then centrifuged at 80,000×g for 10 min at 4° C. followed by vacuum filtration using two layers of Whatman #1 filter paper. Initial purification was performed by solid-phase extraction. The C-18 reversed-phase solid phase Sep-Pak extraction cartridges (Vac 10 cc) were primed with ...

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Abstract

A novel mammalian dihydroouabain-like factor is disclosed which substantially fails to cross-react with mammalian ouabain-like factor (OLF) for binding to anti-OLF antibody, but cross-reacts with plant-related dihydroouabain (dho) for binding to anti-dho antibody, has maximal u.v. absorbance at 196 nm, has a non-peptidic, non-lipidic chemical structure and a fully hydrogenated lactone ring, has a concentration-dependent Na+,K+-ATPase (sodium pump) catalytic inhibitory activity which is 10-fold lower than OLF and 3-fold higher than plant-related dihydroouabain, and a high pressure liquid chromatography elution time about the same as dho. This factor is useful for therapy for congestive heart failure. An antibody and antibody fragments having affinity for mammalian Dh-OLF but not for OLF, and diagnostic and therapeutic methods comprise the antibody and means for quantifying the antibody and are useful for treating a condition caused by high level of OLF or Dh-OLF. Two isomers of plant-related dihydroouabain have been isolated. These compositions and methods are suitable for characterizing a variety of diseases and conditions associated with reduced sodium pump activity.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] This invention relates to the field of mammalian ouabain-like factors (OLF) and more particularly to a novel dihydroouabain like factor (Dh-OLF), and its use for the detection and treatment of conditions and diseases associated with regulation of the sodium-potassium pump, in particular for the detection and treatment of congestive heart failure. This invention also relates to those plant cardenolides that are cardiac glycosides. This invention also relates to antibodies and antibody fragments useful for the treatment of toxicity due to excess OLF or Dh-OLF. [0003] 2. Description of the Background [0004] Digoxin and ouabain, plant cardenolides that are the two most commonly used cardiac gylcosides, are commonly administered to patients suffering from congestive heart failure because of their beneficial effect on cardiac contractility, that is, their positive inotropic effect. Positive inotropic effect generally refe...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A01N45/00A61K31/7048A61K38/00G01N33/53A61K39/395A61K45/00A61P9/04A61P9/12A61P25/28A61P27/12C07J19/00C07K14/47C07K14/705C07K16/18C07K16/28G01N33/533G01N33/534G01N33/535
CPCA61K38/00C07K16/18C07K14/4703C07J19/005A61P25/28A61P27/12A61P9/04A61P9/12
Inventor VALDES, ROLAND JR.QAZZAZ, HASSAN M.A.M.
Owner UNIV OF LOUISVILLE RES FOUND INC
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