Abstract:
The present invention is directed to diagnostic and therapeutic methods based on the unexpected discovery that certain antibacterial proteins, in particular lysozyme and lactoferrin, bind to advanced glycosylation endproducts (AGEs) with high affinity, and that this binding activity is substantially non-competitive with binding of bacterial carbohydrates to the antibacterial proteins. Accordingly, the invention relates to methods for treating diseases and disorders associated with increased levels of AGEs, by administering a molecule having a hydrophilic loop domain, which domain in lysozyme and lactoferrin is associated with AGE-binding activity, and compositions comprising such a domain. The invention further relates to methods and compositions for partitioning AGEs away from a sample. The invention is also directed to methods for determining a prognosis of AGE complications in a patient suffering from an AGE-associated disease or disorder by measuring the level of activity of antibacterial proteins, such as lysozyme and lactoferrin, in a biological sample from a subject. Decreased levels of antibacterial protein bacteriocidal activity may be indicative of increased levels of AGEs, and a prognostic indicator of increased susceptibility to bacterial infection. In a further aspect, the invention relates to detection of AGEs in a biological sample. In specific embodiments, AGEs inhibit the bacteriocidal activity of lysozyme and lactoferrin, and 17 or 18 amino acid hydrophilic loop peptides bracketed by cysteine (the first and last amino acids are cysteine that form a disulfide bond) bind to AGE-bovine serum albumin.
Abstract:
The present invention relates to compositions and methods for inhibiting the release and/or biological activity of migration inhibitory factor (MIF). In particular, the invention relates to the uses of such compositions and methods for the treatment of various conditions involving cytokine-mediated toxicity, which include, but are not limited to shock, inflammation, graft versus host disease, and/or autoimmune diseases.
Abstract:
The present invention relates to compositions and methods for inhibiting and reversing nonenzymatic cross-linking (protein aging). Accordingly, compositons are disclosed which comprise an agent capable of inhibiting the formation of advanced glycosylation endproducts of target proteins, and which additionally reverse pre-formed crosslinks in the advanced glycosylation endproducts by cleaving alpha-dicarbonyl-based protein crosslinks present in the advanced glycosylation endproducts. Certain agents useful are thiazolium salts. The method comprises contacting the target protein with the composition. Both industrial and therapeutic applications for the invention are envisioned, as food spoilage and animal protein aging can be treated. A novel immunoassay for detection of the reversal of the nonenzymatic crosslinking is also disclosed.
Abstract:
This invention concerns new methods and compositions that are useful in preventing and ameliorating cachexia, the clinical syndrome of poor nutritional status and bodily wasting associated with cancer and other chronic diseases. More particularly, the invention relates to aromatic guanylhydrazone (more properly termed amidinohydrazone) compositions and their use to inhibit the uptake of arginine by macrophages and/or its conversion to urea. These compositions and methods are also useful in preventing the generation of nitric oxide (NO) by cells, and so to prevent NO-mediated inflammation and other responses in persons in need of same. In another embodiment, the compounds can be used to inhibit arginine uptake in arginine-dependent tumors and infections.
Abstract:
Methods are disclosed for measuring the accumulation of advanced glycosylation endproducts (AGEs), and for lowering the accumulation of advanced glycosylation endproducts, which are predicated on the discovery that such AGEs and their precedent glycotoxins are present in tobacco and its byproducts. More particularly the methods focus on the observation that individuals who smoke or otherwise use tobacco have increased levels of AGEs relative to non-smoking individuals. The present methods relate to the measurement of AGE levels in both individuals and in tobacco and its byproduct, smoke, and to the treatment of such individuals with agents capable of reacting with glycosylation products to either avert or diminish the accretion of AGEs in the body. Methods are also disclosed for the evaluation of the tobacco products to determine their storage status and organoleptic capacity and potential, for the treatment of the ambient atmosphere to lower AGE levels, and for the treatment of the tobacco products and combustion byproducts to lower AGE levels therein. For example, air or other samples may be taken and evaluated by a dosimeter or like device, to determine whether AGE levels exceed normal, after which measures could be implemented to remediate the ambient condition. Likewise, filters and similar devices for removing AGEs from tobacco smoke are disclosed. All such methods and corresponding materials are contemplated and included.
Abstract:
The present invention relates to compositions and methods for inhibiting the aging of amino-containing amino acid, peptides, proteins and biomolecules. Accordingly, a composition is disclosed which comprises an agent or compound capable of reacting with the glycosyl-amino moiety of the early glycosylation product (also known as the Amadori product or the Heyns product) formed by the reaction of glucose, or other reactive sugars, with an amino-containing peptide, protein or biomolecule, thus stabilizing this early glycosylation product, and preventing its further reaction to form open-chain, carbonyl-containing advanced glycosylation end products. Suitable agents may contain a reactive aldehyde group. A preferred agent is acetaldehyde. The method comprises contacting the target biomolecule with the composition. The compounds so obtained are represented by formulae (VI) and (VIII) wherein R is the residue of an amino-containing biomolecule such as a peptide and CH2R' is the residue of the reactive aldhehyde group. Both industrial and therapeutic applications for the invention are envisioned, as food spoilage and animal protein aging can be treated.
Abstract:
The present invention concerns compounds that possess anti-infective activity. The invention encompasses methods of use of such compounds for treatment or prevention of infectious diseases, such as parasitic and viral diseases, including, for example, malaria and acquired immunodeficiency syndrome. The use of the compounds to detect certain specific protein structures which are present in nuclear localization sequences is also taught.
Abstract:
The in vivo oxidation of lipids and lipid-containing molecules has been discovered to be initiated by the concurrent reaction of such lipid materials with reducing sugars such as glucose, advanced glycosylation endproducts such as AGE-peptides, or a compound which forms advanced glycosylation endproducts, to form materials or particles known as AGE-lipids. AGE-lipids have been implicated in the aging process, the abnormal formation of lipofuscin and invarious disease states such as diabetes and atherosclerosis. Diagnostic methods are contemplated, extending in utility from the detection of the onset and course of conditions in which variations in lipid oxidation, AGE-lipid levels, LDL levels, apolipoprotein levels, apolipoprotein receptor binding the like, may be measured, to drug discovery assays. Corresponding methods of treatment and pharmaceutical compositions are disclosed that are based on an active ingredient or ingredients that demonstrate the ability to modulate the levels of all the foregoing markers of lipid oxidation.
Abstract:
There is disclosed pharmaceutical compositions for the treatment of HIV-infection using cyclophilin A and its corresponding human cellular binding partner as a target for intervention. There is further disclosed a method of using cyclophilins, anti-cyclophilin antibodies, and pegylated cyclosporin A as a treatment for HIV-infection. The present invention further provides screening assays for the identification of compounds which inhibit the interaction of cyclophilin and its cellular receptor.
Abstract:
There is disclosed assays to identify compounds that inhibit an enzymatic activity of MIF (macrophage migration inhibitory factor). The enzyme activity catalyzes a tautomerization of MIF-substrates, such as D-dopachrome to DHICA. In general, the assay is conducted in vitro by adding, mixing or combining MIF polypeptide and a suitable substrate in the presence or absence of a test compound, and measuring the tautomerization of the substrate. The test compounds that inhibit tautomerization in the assay are identified as MIF inhibitors.