Drug target for preventing and treating periodontal disease, improving healing of periodontal wounds and promoting oral health

Abstract

The present invention relates to the use of a component of the plasminogen-activating pathway and use of compounds which have the capacity to activate plasminogen directly or via the plasminogen-activating pathway, for prophylaxis, prevention and treatment of periodontal disease including peri-implantitis, healing of periodontal wounds and prompting oral health in human and non-human subjects.

Description

FIELD OF INVENTION[0001]This invention relates to compound and methods for prophylaxis, prevention and / or treatment of infectious periodontal disease e.g. gingivitis and periodontitis, and necrotic conditions affecting the gum tissue, relates to promoting oral health in general, and also relates to improving healing of periodontal wounds such as surgical wounds locally. In particular, the invention relates to a novel method of preventing and treating infectious periodontal disease, promoting oral health and improving healing of periodontal wounds.BACKGROUND[0002]Periodontal Disease[0003]Periodontal disease is a chronic inflammatory disease that affects the tissues that support and anchor the teeth, also known as the periodontium. It is caused by the imbalanced interplay between the specific subgingival microorganisms and the host immune and inflammatory response (1). It affects nearly three-quarters of the adult populations and is regarded as one of the most common diseases to human...

AI Technical Summary

Benefits of technology

[0024]The present invention relates to the novel discovery that components of the plasminogen-activation pathway, and compounds with the capacity to activate plasminogen can be used for new and improved strategies for preventing and treating periodontal disease and tissue necrosis, for healing of periodontal wounds (such as surgical wounds) and for promoting oral health in general. The administration of plasminogen and / or other members of the plasminogen-activation pathway or compounds with the capacity to activate plasminogen play a pluripotent role in protecting against bacterial-induced infection and promoting healing of periodontal wounds by activating inflammatory cells, accelerating migration of keratinocytes, killing bacteria, removing necrotic tissue and enhancing cytokine expression. The extensive occurrence of periodontal disease in plasminogen-deficient mice under natural conditions also provides an excellent animal model to for studying periodontal disease, and screening methods for identifying and evaluating new drugs and treatment methods for various aspects of periodontal disease, periodontal wound improvement and prompt oral health in general.

[0029]In another embodiment, the invention provides a method for prophylaxis, prevention and treatment of periodontal disease, especially infectious periodontal disease, improving healing of periodontal wounds such as surgical wounds and promoting oral health in human or non-human subjects by administering a compound or drug which is plasminogen or plasmin and their derivatives, an activator of plasminogen, or a compound enhancing the activity of plasmin. Preferably, the compound is administered locally to attain a high concentration in the infected area.

[0030]Moreover, the invention provides for a method for reducing or preventing oral necrosis formation by administering a composition comprising local or systemic administration of a composition comprising a compound which is a component of the plasminogen activation pathway or compounds with the capacity to activate plasminogen. The composition may be part of a gel, lotion, balm, paste, or wound dressing. Alternatively, the composition may be administered systemically. In one embodiment, the method of the invention is applied in conjunction with plastic surgery in the periodontal tissue to reduce the occurrence and the formation of infection, ulcer and necrosis.

[0036]According to the invention, providing or enhancing the levels of plasminogen and / or plasmin can be used for prophylaxis, prevention and treatment of periodontal disease, accelerating the healing of periodontal wounds and prompting the oral health. This may be accomplished in many different ways. For instance, by treating a patient with active agents, drugs, hormones, cytokines, antibodies, or other compounds that up-regulate the expression of plasmin, plasminogen, or plasminogen-activators; reduce the degradation of either of these components; the local or systemic levels of plasminogen and / or plasmin can be increased. In another embodiment, local plasmin or plasminogen level is increased by directly applying plasmin / plasminogen proteins and their derivatives. In yet another embodiment, plasmin activity is enhanced by administration of an activator of plasmin or plasminogen. In further another embodiment, an artificial, a recombinant or a bacterial plasminogen activator such as streptokinase and staphylokinase is used. In further another embodiment, a fragment of plasminogen protein sequence such as synthetic peptides, kringle domains miniplasminogen or miniplasmin is used.

Problems solved by technology

Furthermore, serious periodontal disease can lead to bad breath, heart disease and stroke, diabetes, respiratory diseases and premature delivery during pregnancy.

Thus, periimplantitis is an inflammatory / infectious process affecting the tissues around an osseointegrated implant in function, resulting in loss of supporting bone.

Periimplantitis may lead to complete disintegration and implant loss even if extensive treatment aiming at resolving the periimplant infection has been performed.

However, many antimicrobials are not as effective as they used to be.

Ultimately, the increasing difficulty in fighting off microbes leads to an increased risk of acquiring infections in a hospital or other setting.

Drug resistance is an especially difficult problem for hospitals harboring critically ill patients who are less able to fight off infections without the help of antibiotics.

However, despite the various therapeutic methods that have successfully improved the treatment of periodontal disease, great challenges in oral health still exist.

Such challenging factors include the increasing resistance of oral bacteria against antibiotics, the needs for simpler methods to improve oral health in general, the expensive and tedious dental care procedure, the stressful modern life and the heavier dental burden in under-privileged groups in developed and developing countries.

In contrast with apoptosis, cleanup of cell debris by phagocytes of the immune system is generally more difficult, as the disorderly cell death generally does not send “eat-me” cell signals which tell nearby phagocytes to engulf the dying cell.

This lack of signalling makes it harder for the immune system to locate and recycle dead cells which have died through necrosis than if the cell had undergone apoptosis.

The injuries received by the cell may compromise the lysosome membrane, or may set off an unorganized chain reaction which causes the release in enzymes.

Unlike in apoptosis, cells that die by necrosis may release harmful chemicals that damage other cells.

Unless properly treated, necrotizing gingivitis has a marked tendency for recurrence and lead to considerable loss of periodontal support.

The third is enzymatical, the enzyme used is mainly collagenase (eg: Santyl), however, the effect is too slow when infection presents; and the fourth is through autolytic method, which is via enzymes in wound fluid but the effect is extremely slow.

However, none of the four treatment methods could give a functional and aesthetically satisfactory necrosis removal and tissue remodeling.

As a consequence, plasmin can be generated on the surface of microorganisms such as Haemophilus influenzae, Salmonella typhimurium, Streptococcus pneumoniae, Yersinia pestis, and Borrelia burgdorferi, which can lead to a degradation of mammalian ECM.

This could be due to an imbalance between the oral microbiota, alterations in phagocyte function and / or specific immune response.

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