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Methods of reducing hypoxic stress in a mammal by administering soluble p-selectin

a technology of soluble platelet and p-selectin, which is applied in the direction of drug composition, peptide/protein ingredients, extracellular fluid disorder, etc., can solve the problems of loss or decrease of coagulation ability, complicated pathogenic factors, side effects, etc., and achieve the effect of stabilizing blood pressure and reducing hypoxic stress

Active Publication Date: 2013-02-21
CHANG HSIN HOU +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is about a new treatment for reducing injury caused by lack of oxygen in a mammal. This treatment involves giving the mammal a pill made of a specific protein called soluble P-selectin. This protein is thought to help protect the body's tissues from damage caused by lack of oxygen. The treatment can be used to make a medicine for this purpose.

Problems solved by technology

Hemorrhagic conditions are diverse in classification, and their pathogenic factors are complicated, including such as abnormality in the structure of vascular walls or connective tissues, abnormality in the amount or function of platelets, abnormality in coagulant factors, over-fibrinolysis, and circulating anti-coagulant substances.
Inherited hemorrhagic conditions, such as hemophilia, are resulted from mutations in the coagulant factors, which result in the loss or decrease of coagulation ability.
The presently known coagulant drugs (such as anti-fibrinolysis agents) are only suitable for treating local hemorrhage.
Such coagulant drugs form small thrombus in vivo quickly, and thus often result in side effects such as myocardial infarction and cerebral stroke.
Therefore, there exists no suitable and safe systemic haemostatic drugs without side effects.
However, said study did not indicate that soluble P-selectin can be used in the treatment of systemic hemorrhagic conditions.
However, said literatures did not suggest anything regarding the treatment of systemic hemorrhagic conditions, either.

Method used

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  • Methods of reducing hypoxic stress in a mammal by administering soluble p-selectin
  • Methods of reducing hypoxic stress in a mammal by administering soluble p-selectin
  • Methods of reducing hypoxic stress in a mammal by administering soluble p-selectin

Examples

Experimental program
Comparison scheme
Effect test

example

Example 1

Plasma Clotting Test of Dengue Hemorrhagic Fever and Anthrax Lethal Toxin

[0039]In the plasma clotting test, the blood from C57BL / 6J mice was centrifuged under 1,500×g for 25 minutes to obtain the “platelet-poor plasma” (PPP) of the mice. Equal volume of 20 mM CaCl2 was added to the obtained plasma, and the change in absorbance resulted from coagulation was recorded under stirring (800 rpm) and 37° C. on an aggregometer (Model 600B, Ion-Trace, Stouffville, Canada), and the plasma clotting time was determined.

[0040]The following reagents were used in the plasma clotting test of this example: recombinant P-selectin-Ig Fc protein (purchased from R & D Systems Inc., Minneapolis, Minn., USA), as the source of P-selectin; dengue non-structural protein 1, as the dengue virus protein, which was obtained from the PCR-synthesized structural protein 1 gene of the Taiwan local strain PL046 of dengue virus type II (Chang et al., 2002, J. Infect. Dis. 186, 743-51); recombinant anthrax let...

example 2

[0043]Mouse Protection Test of Anthrax Lethal Toxin and Hemorrhagic Venoms

[0044]In the test of mouse protection by P-selectin, mice were first injected with the recombinant P-selectin-Ig protein, P-selectin+neutralizing monoclonal antibody, or control human immunoglobulin IgG (the dosages are all 1.2 μg / g). After 4 hours, the mice were intravenously injected with anthrax lethal toxin and hemorrhagic venoms. The time of death of the mice were observed. The sources of the recombinant P-selectin-Ig protein and anthrax lethal toxin are shown in Example 1. Venoms of Crotalus atrox and Crotalus adamanteus (purchased from Sigma, St. Louis, Mo., USA) were used as the hemorrhagic venoms.

[0045]As shown in FIG. 2A, the injected venoms of Crotalus atrox and Crotalus adamanteus each resulted in the death of all the six mice (C57BL / 6J) within 1 hour. However, the mice previously injected with recombinant soluble P-protein all survived for more than 3 months, which proves that soluble P-selectin p...

example 3

Protection Test of Mice with Bacteremia

[0047]The reagents and method of the mouse protection test are as shown in Example 2. The bacteremia of mice was simulated by injecting 1×108 bacteria / g of Escherichia coli (E. coli) into the plasma of mice (C57BL / 6J). As shown in Table 1, all the six mice injected with the E. coli solution died within 24 hours. However, the mice previously injected with recombinant soluble P-protein survived for two more days in average. Therefore, soluble P-selectin does provide mice with protection against bacteremia.

TABLE 1Treatment of MiceAverage Surviving DaysInjected with Soluble P-selectinOver 90 DaysInjected with E.coli Solution1 DayInjected with E.coli Solution+3 DaySoluble P-selectin

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Abstract

The present invention provides a use of soluble P-selectin in treating systemic hemorrhagic conditions, stabilizing blood pressure, and protecting hypoxic / ischemic tissues. Also provided is a use of anthrax lethal toxin in treating thrombotic conditions.

Description

FIELD OF THE INVENTION[0001]The present invention relates to novel uses of soluble platelet-selectin (P-selectin) in treating of systemic hemorrhagic conditions, stabilizing blood pressure, reducing the hypoxic / ischemic stress and protecting hypoxic / ischemic tissues.BACKGROUND OF THE INVENTION[0002]Hemorrhagic conditions are diverse in classification, and their pathogenic factors are complicated, including such as abnormality in the structure of vascular walls or connective tissues, abnormality in the amount or function of platelets, abnormality in coagulant factors, over-fibrinolysis, and circulating anti-coagulant substances. Based on the involvement of inheritance, hemorrhagic conditions can be divided into inherited and non-inherited hemorrhagic conditions. Inherited hemorrhagic conditions, such as hemophilia, are resulted from mutations in the coagulant factors, which result in the loss or decrease of coagulation ability. Clinically, most hemorrhagic conditions are non-inherite...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61K38/17A61P25/00A61P9/00A61P43/00A61K38/16
CPCA61K38/178A61P25/00A61P43/00A61P7/00A61P9/00Y02A50/30
Inventor CHANG, HSIN-HOUSUN, DER-SHAN
Owner CHANG HSIN HOU
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