Growth Factors in Periodontal Regeneration

step-up Factors in Periodontal RegenerationGROWTH FACTORS IN periodontic REGENERATIONABSTRACT Periodontitis and solely periodontal diseases are bacterial infections that destroy the adherence fibers and supporting b unitary. Left untreated, these diseases can lead to tooth loss. The main cause of periodontal disease is a bacterial plaque, many options are available to treat this disease including non-surgical,surgical,and recent regenerative materials. GFs are natural biological mediators that mould key prison cadreular events that are part of the exercise of wander repair and innovation. Recent advances in the areas of kioskular and molecular biology allowed better understanding of the functions of GFs and their participation in the distinct phases of hurt healing. In vitro and in vivo studies have confirmed that GFs can enhance the capacity of tissues to regenerate by regulating cell chemo attraction, speciality and proliferation. This review focuses on five yield e lement families that have potential for inducing periodontal regeneration based on their ability to stimulate osteoblast and periodontal ligament cells in vivo and vitro.Key words platelet-derived egress means, insulin-like harvest-feast factor, transforming egress factor-beta, fibroblast growth factor, and bone morphogenetic protein.INTRODUCTION Periodontitis is a widely prevalent seditious disease of the tissues supporting the teeth, characterized by a progressive loss of bone and attachment. The ultimate goal of periodontal therapy is the regeneration of periodontal tissues, which consists in stimulating new cementum system, new alveolar bone apposition, and a functionally-oriented periodontal ligament reconstruction.Conventional intercession procedures whitethorn be ineffective in achieving bone regeneration, leaving both the clinician and the patient dissatisfied with the exposecome. Growth factors (GFs) have long been believed to have the potential to accelerate the he aling process and, therefore, enhance tissue regeneration in challenging clinical scenarios.1MODE OF ACTION OF GROWTH FACTORSTo waken a biologic effect, a growth factor moldiness be synthesized by an originating cell, travel to its scar sense organ, interact with target receptor, or binding protein, and activate second messengers or terminal effectors.2,3Local sense modality of action is more associated with the term growth factor and involves Paracrine, Autocrine, Juxtacrine, and Intracrine modes.Autocrine mode of action Growth factors synthesized by one cell, secreted in a soluble form outside the cell and then bind to surface receptors on the same cell to evoke an effect is autocrine mode of action. Example includes TGF , which are produced and act on epithelial cells, and BMPs, which are produced and act on osteoblastic cells. (fig 1)Intracrine mode of actionGrowth factors produced by one cell and not secreted, but acts intracellularly to facilitate its make is intracrine mode of action. (fig 2)Paracrine mode Growth factorsproduced by one cell, with receptors present on another cell in the local micro environment is the paracrine mode of action. Here the mediators are secreted in soluble form and binds to its receptors on the target cell to evoke its effect. (fig 3)Juxtacrine mode It is similar to paracrine effects drop that the factor produced by the cell of origin is cell surface recoil and requires cell contact by the target cell to evoke a response. (fig 4)RECEPTORS FOR GROWTH FACTORS4,5For a growth factor to exert an effect, its designated receptor must be present in sufficient quantity, orientation, and functional activity to transmit appropriate stimuli.Growth factor receptors can be divided into 2 broad categoriesCell surface receptorsIntracellular receptorsThe most(prenominal) common prototype growth factor receptor is the cell surface receptor, which can be further divided into common chord main categoriesG- protein linkedReceptor ty rosine kinasesSerine threonine receptor kinasesPOTENTIAL ROLES OF GROWTH FACTORS IN PERIODONTAL REGENERATIONTo stimulate cell proliferation. E.g. Platelet derived growth factor (PDGF).To enhance function of cells and cell differentiation. E.g. trick up morphogenetic protein (BMP).To stimulate matrix synthesis. E.g. Transforming growth factor- (TGF- ).To act as co-factors for gene expression.DISADVANTAGES OF GROWTH FACTORSThey were intended to be make by cells, stored than used locally.They have short half-lives i.e., when used as drug, doses must be greater than veritable in vivo concentrations.They affect various cells in individual ways i.e., cells growing in high concentrations of growth factor had an increased susceptibility to cell death upon growth factor withdrawal.They need a pitch system for sustained or, controlled release (in low concentration) of a biologically wide awake growth factor or, cocktail of growth factors.POLYPEPTIDE GROWTH FACTORS Polypeptide growth fac tors are a diverse grouping of hormone-like agents that regulate growth and differentiation by cell surface receptors. They are generally represented by homologous families containing several members with distinct coincide receptor interactions and hence, responsive tissue specificities. Similarly, their receptors are also clustered in family groups of sequence-related proteins.COMMON FEATURES OF POLYPEPTIDE GROWTH FACTORS 6Natural cell products Growth factors are natural cell products that are released or activated when cell division is needed.This action typically occurs during such events as wound healing or, tissue regeneration.Local actions With hardly a(prenominal) exceptions,growth factors are locally acting.Receptor activity Because growth factors cannot diffuse across the cell membrane, growth factors must exert their activity by archetypical binding to high-affinity cell membrane receptors.The capacity of a cell to respond to a given factor is therefore dependent on the presence of these receptors.Regulation The intersection of polypeptide growth factors is tightly regulated in normal cells. In contrast, unregulated production of growth factor is thought to be an important component of proliferative disorders, such as fibrotic disease and cancers.Multifunctional activities Polypeptide growth factors are multifunctional, sum that they may stimulate a wide variety of cellular activities, which include growth, migration, differentiation and production of extracellular matrix proteins.Mechanism of action In some cases, growth factors can stimulate the same cell that synthesizes the molecule (autocrine stimulation) or can affect nearby cells (paracrine stimulation).Regeneration Tissue regeneration in vivo likely reflects the combined effect of several different growth factors.GROWTH FACTOR APPLICATIONS FOR ORAL AND PERIODONTAL create from raw stuff ENGINEERING Therapeutic operation of growth factors to restore damaged tissues aims at regenerati on through biomimetic processes, or mimicking the processes that occur during embryonic and post-natal development.7The complexity of these events suggests that creating an optimal regenerative environment requires the combination of different growth factors as plant in natural reparative processes. The use of a single recombinant growth factor may also start several molecular, biochemical and morphological cascades that will result in tissue regeneration.8The most canvass growth factors for periodontal regeneration have been PDGF, IGF, FGF-2, TGF- and different BMPs.SI. NOGROWTH FACTORALTERNATIVE callSOURCE1Platelet-derived growth factorFibroblast-derived growth factor.Glioma-derived growth factorDegranulating plateletsEndothelial cells Smooth muscles Macrophages- Fibroblasts2Insulin-like growth factorErythropoetic factor Growth-promoting activity for vascular endothelial cellsMacrophages- Osteoblasts- Plasma stored in bone3Transforming growth factor-Epithelial cell specific growth inhibitor Tumour-inducing factor-1Platelet granules4Fibroblast growth factor familyheparin binding growth factorMacrophage and osteoblasts stored in bone.PLATELET DERIEVED GROWTH FACTORThe PDGFs are a family of dimeric disulfide bound growth factors that exert their biologic effects by activating 2 structurally related tyrosine kinase receptors, the PDGF- and PDGF receptors.PDGF was the first growth factor to be evaluated in preclinical periodontal and peri-implant regenerative studies. Proliferation, migration and matrix synthesis were observed on cultures of periodontal cells stimulated by PDGF, including gingival and PDL fibroblasts, cementoblasts, preosteo-blasts and osteoblastic cells 9-14. These effects were demon to be time- and dose dependent 14. The PDGF family is peaceful of four growth factors PDGF- A, -B, and the most recently discovered PDGF-C and -D 15. All of these participate in the wound-healing process, but, until now, only the three isoforms PDGF-A A, BB and AB were evaluated in periodontal therapy. PDGF-BB is the most effective on PDL cell mitogenesis and matrix biogenesis 16,17.INSULIN LIKE GROWTH FACTORThese are a family of single chain serum proteins that share 49% homology in sequence with pro- insulin. IGF-1 and IGF- 2 are two polypeptides from this group. IGF-1 acts as progression factor, also stimulates bone formation and have an effect on periodontal ligament cells. IGF-I is also important for bone remodeling and maintenance of skeletal trade and plays significant role in age-related osteoporosis.IGF-1 is capable of preventing apoptosis in fibroblasts by activation of multiple foretell transduction pathways. IGF-1 has also been shown to regulate deoxyribonucleic acid and protein synthesis in periodontal ligament fibroblasts in vitro and to enhance soft tissue wound healing in vivo. Furthermore, studies have suggested variable responses of periodontal tissues to IGF-1 depending upon anatomical sites and a differenti al booking of IGF-1 in periodontal wound healing and regeneration.18FIBROBLAST GROWTH FACTORThe angiogenic and fibroblast stimulatory properties of FGF-2 during wound healing and its chemotactic and proliferative effects on PDL cells suggest its use for periodontal regenerative therapeutic approaches19,20. In preclinical studies, this growth factor was evaluated for the treatment of different types of periodontal bone defects, in dogs and non- humankind primates. Despite different concentrations of FGF-2 and different delivery systems used in the studies, all showed an improvement in the periodontal tissue regeneration, compared with control groups. Studies that evaluated more than one concentration of FGF-2 suggested that its effects are dose dependent.21,22TRANSFORMING GROWTH FACTOR It is a member of a large family of biologically active protein hormones that are structurally related but differ markedly in their function. TGF consists of 2 subunits held together by covalent bon ds. Five different genes are identified that encodes TGF- polypeptide TGF- has 5 closely related isoforms in vertebrates, out of which 3 are found in mammals (TGF-1, TGF-2, TGF-3).The three major activities of TGF-include inhibition of cell proliferation, sweetening of extracellular matrix deposition and the exhibition of complex immune governory properties. It is a major regulator of cell replication and differentiation. It can stimulate or inhibit cell growth. It can also mold other growth factors like PDGF, EGF and FGF. It inhibits epithelial cell proliferation and stimulates mesenchymal cells.TGF-1, the most abundant isoform of the TGF- family and found primarily in the platelets and osseous tissue, has been used for this application.It has a role in recruiting and stimulating osteoprogenitor cells to proliferate and suggests to support periodontal wound healing and regeneration.23BONE MORPHOGENETIC PROTEINSThe name study Morphogenetic Protein was given in 1965 by Urist . s wot morphogenetic proteins (BMPs) are a group of regulatory glycoproteins that are members of the transforming growth factor-beta superfamily.24They stimulate angiogenesis and migration, proliferation and differentiation of mesenchymal stem cells into cartilage and bone forming cells. More than 20 BMP-related proteins have been identified, several of which induce bone formation.25In the field of periodontal regeneration, much of the research gratify has focused on BMP-2, BMP-3 (osteogenin), and BMP-7. Recent studies have utilized recombinant human BMP to determine their potential for correcting intrabony, supra-alveolar, furcation, and fenestration defects. BMPs also show much promise in promoting dental implant wound healing.24GROWTH FACTOR DELIVERY SYSTEMS some(prenominal) matrices and delivery systems have been used and evaluated for their efficacy and biocompatibility as carrier for growth factors. Two common types of polymeric materials used in growth factor delivery strategie s are natural collagen-derived materials and synthetic polymers of lactic and glycolic battery-acid (i.e., Poly lactide-co-glycolide). Extracellular matrix-derived macromolecules such as collagen have been used for many years in biomaterial application, and it is now feasible to create artificial analogues of extracellular matrix proteins using recombinant DNA technology.1Carriers can be of different types such as solids, gels or combinations.25A variety of new injectable materials such as hydrogels are also universe developed for growth factor delivery applications and have been of special interest. These injectables are especially attractive because, in clinical application, they can allow for minimally invasive delivery of inductive molecules.1CONCLUSIONGrowth factors may regulate the repair and/or regenerative process which are impaired in presence of bacteria and their products in periodontal disease. 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