BACKGROUND The self-assembly of solid organs from stem cells has the potential to greatly expand the applicability of regenerative medicine.Stem cells can self-organise into microsized organ units,partially modelling ...BACKGROUND The self-assembly of solid organs from stem cells has the potential to greatly expand the applicability of regenerative medicine.Stem cells can self-organise into microsized organ units,partially modelling tissue function and regeneration.Dental pulp organoids have been used to recapitulate the processes of tooth development and related diseases.However,the lack of vasculature limits the utility of dental pulp organoids.AIM To improve survival and aid in recovery after stem cell transplantation,we demonstrated the three-dimensional(3D)self-assembly of adult stem cell-human dental pulp stem cells(hDPSCs)and endothelial cells(ECs)into a novel type of spheroid-shaped dental pulp organoid in vitro under hypoxia and conditioned medium(CM).METHODS During culture,primary hDPSCs were induced to differentiate into ECs by exposing them to a hypoxic environment and CM.The hypoxic pretreated hDPSCs were then mixed with ECs at specific ratios and conditioned in a 3D environment to produce prevascularized dental pulp organoids.The biological characteristics of the organoids were analysed,and the regulatory pathways associated with angiogenesis were studied.RESULTS The combination of these two agents resulted in prevascularized human dental pulp organoids(Vorganoids)that more closely resembled dental pulp tissue in terms of morphology and function.Single-cell RNA sequencing of dental pulp tissue and RNA sequencing of Vorganoids were integrated to analyse key regulatory pathways associated with angiogenesis.The biomarkers forkhead box protein O1 and fibroblast growth factor 2 were identified to be involved in the regulation of Vorganoids.CONCLUSION In this innovative study,we effectively established an in vitro model of Vorganoids and used it to elucidate new mechanisms of angiogenesis during regeneration,facilitating the development of clinical treatment strategies.展开更多
Salivary glands(SG)are exocrine organs with secretory units commonly injured by radiotherapy.Bio-engineered organoids and extracellular vesicles(EV)are currently under investigation as potential strategies for SG repa...Salivary glands(SG)are exocrine organs with secretory units commonly injured by radiotherapy.Bio-engineered organoids and extracellular vesicles(EV)are currently under investigation as potential strategies for SG repair.Herein,three-dimensional(3D)cultures of SG functional organoids(SGo)and human dental pulp stem cells(hDPSC)were generated by magnetic 3D bioassembly(M3DB)platforms.Fibroblast growth factor 10(FGF10)was used to enrich the SGo in secretory epithelial units.After 11 culture days via M3DB,SGo displayed SG-specific acinar epithelial units with functional properties upon neurostimulation.To consistently develop 3D hDPSC in vitro,3 culture days were sufficient to maintain hDPSC undifferentiated genotype and phenotype for EV generation.EV isolation was performed via sequential centrifugation of the conditioned media of hDPSC and SGo cultures.EV were characterized by nanoparticle tracking analysis,electron microscopy and immunoblotting.EV were in the exosome range for hDPSC(diameter:88.03±15.60 nm)and for SGo(123.15±63.06 nm).Upon ex vivo administration,exosomes derived from SGo significantly stimulated epithelial growth(up to 60%),mitosis,epithelial progenitors and neuronal growth in injured SG;however,such biological effects were less distinctive with the ones derived from hDPSC.Next,these exosome biological effects were investigated by proteomic arrays.Mass spectrometry profiling of SGo exosomes predicted that cellular growth,development and signaling was due to known and undocumented molecular targets downstream of FGF10.Semaphorins were identified as one of the novel targets requiring further investigations.Thus,M3DB platforms can generate exosomes with potential to ameliorate SG epithelial damage.展开更多
Human dental pulp stem cells(hDPSCs) promote recovery after ischemic stro ke;however,the therapeutic efficacy is limited by the poor survival of transplanted cells.For in vitro expe riments in the present study,we use...Human dental pulp stem cells(hDPSCs) promote recovery after ischemic stro ke;however,the therapeutic efficacy is limited by the poor survival of transplanted cells.For in vitro expe riments in the present study,we used oxygen-glucose deprivation/reoxygenation in hDPSCs to mimic cell damage induced by ischemia/reperfusion.We found that miRNA-34a-5p(miR-34a) was elevated under oxygen-glucose deprivation/reoxygenation conditions in hDPSCs.Inhibition of miR-34a facilitated the prolife ration and antioxidant capacity and reduced the apoptosis of hDPSCs.Moreove r,dual-luciferase reporter gene assay showed WNT1and SIRT1 as the targets of miR-34a.In miR-34a knockdown cell lines,WNT1 suppression reduced cell prolife ration,and SIRT1 suppression decreased the antioxidant capacity.Togethe r,these results indicated that miR-34a regulates cell prolife ration and antioxidant stress via targeting WNT1 and SIRT1,respectively.For in vivo expe riments,we injected genetically modified hDPSCs(anti34a-hDPSCs) into the brains of mice.We found that anti34a-hDPSCs significantly inhibited apoptosis,reduced cerebral edema and cerebral infarct volume,and improved motor function in mice.This study provides new insights into the molecular mechanism of the cell prolife ration and antioxidant capacity of hDPSCs,and suggests a potential gene that can be targeted to improve the survival rate and efficacy of transplanted hDPSCs in brain after ischemic stroke.展开更多
Amelogenin can induce odontogenic differentiation of human dental pulp cells(HDPCs),which has great potential and advantages in dentine-pulp complex regeneration.However,the unstability of amelogenin limits its furthe...Amelogenin can induce odontogenic differentiation of human dental pulp cells(HDPCs),which has great potential and advantages in dentine-pulp complex regeneration.However,the unstability of amelogenin limits its further application.This study constructed amelogenin self-assembling peptide hydrogels(L-gel or D-gel)by heating-cooling technique,investigated the effects of these hydrogels on the odontogenic differentiation of HDPCs and explored the underneath mechanism.The critical aggregation concentration,conformation,morphology,mechanical property and biological stability of the hydrogels were characterized,respectively.The effects of the hydrogels on the odontogenic differentiation of HDPCs were evaluated via alkaline phosphatase activity measurement,quantitative reverse transcription polymerase chain reaction,western blot,Alizarin red staining and scanning electron microscope.The mechanism was explored via signaling pathway experiments.Results showed that both the L-gel and D-gel stimulated the odontogenic differentiation of HDPCs on both Day 7 and Day 14,while the D-gel showed the highest enhancement effects.Meanwhile,the D-gel promoted calcium accumulation and mineralized matrix deposition on Day 21.The D-gel activated MAPK-ERK1/2 pathways in HDPCs and induced the odontogenic differentiation via ERK1/2 and transforming growth factor/smad pathways.Overall,our study demonstrated that the amelogenin peptide hydrogel stimulated the odontogenic differentiation and enhanced mineralization,which held big potential in the dentine-pulp complex regeneration.展开更多
Bone morphogenetic protein (BMP) can promote the proliferation of dental pulp cells and induce reparative dentin formation. In this study, the inductive effect of BMP derived from bovine bone matrix on cultured human ...Bone morphogenetic protein (BMP) can promote the proliferation of dental pulp cells and induce reparative dentin formation. In this study, the inductive effect of BMP derived from bovine bone matrix on cultured human dental pulp tissue was observed under light microscope and transmission electron microscope. The results showed that. by the third day of culture, the proliferating star-shaped cells appeared with small cytoplasm and poorly-developed organelles; by the 7th day of the culture, the chondroblast-like cells with rich cytoplasm and well-developed organelles were seen embedded in hyaline matrix. This study suggests that BMP can induce dental pulp cells to differentiate from poorly differentiated state to well-differentiated state.展开更多
Plants have been used for medicinal purposes for thousands of years but they are still finding new uses in modem times. For example, Elaeagnus angustifolia (EA) is a medicinal herb with antinociceptive, anti-inflammat...Plants have been used for medicinal purposes for thousands of years but they are still finding new uses in modem times. For example, Elaeagnus angustifolia (EA) is a medicinal herb with antinociceptive, anti-inflammatory, antibacterial and antioxidant properties and it is widely used in the treatment of rheumatoid arthritis and osteoarthritis. EA extract was loaded onto poly(ε-caprolactone)- poly(ethylene glycol)-poly(ε-caprolactone)(PCLPEG-PCL/EA) nanofibers and their potential applications for bone tissue engineering were studied. The morphology and chemical properties of the fibers were evaluated using Fourier transform infrared spectroscopy, field emission scanning electron microscopy, contact angle measurements and mechanical tests. All the samples had bead-free morphologies with average diameters ranging from 100 to 200 nm. The response of human cells to the PCL-PEGPCL/ EA nanofibers was evaluated using human dental pulp stem cells (hDPSCs). The hDPSCs had better adhesion and proliferation capacity on the EA loaded nanofibers than on the pristine PCL-PEG?PCL nanofibers. An alizarin red S assay and the alkaline phosphatase activity confirmed that the nanofibrous scaffolds induced osteoblastic performance in the hDPSCs. The quantitative real time polymerase chain reaction results confirmed that the EA loaded nanofibrous scaffolds had significantly upregulated gene expression correlating to osteogenic differentiation. These results suggest that PCL-PEG-PCL/ EA nanofibers might have potential applications for bone tissue engineering.展开更多
Gelatin hydrogels by microbial-transglutaminase crosslinking are being increasingly exploited for tissue engineering,and proved high potential in bone regeneration.This study aimed to evaluate,for the first time,the c...Gelatin hydrogels by microbial-transglutaminase crosslinking are being increasingly exploited for tissue engineering,and proved high potential in bone regeneration.This study aimed to evaluate,for the first time,the combination of enzymatically crosslinked gelatin with hyaluronan and the newly developed biotechnological chondroitin in enhancing osteogenic potential.Gelatin enzymatic crosslinking was carried out in the presence of hyaluronan or of a hyaluronan–chondroitin mixture,obtaining semi-interpenetrating gels.The latter proved lower swelling extent and improved stiffness compared to the gelatin matrix alone,whilst maintaining high stability.The heteropolysaccharides were retained for 30 days in the hydrogels,thus influencing cell response over this period.To evaluate the effect of hydrogel composition on bone regeneration,materials were seeded with human dental pulp stem cells and osteogenic differentiation was assessed.The expression of osteocalcin(OC)and osteopontin(OPN),both at gene and protein level,was evaluated at 7,15 and 30 days of culture.Scanning electron microscopy(SEM)and two-photon microscope observations were performed to assess bone-like extracellular matrix(ECM)deposition and to observe the cell penetration depth.In the presence of the heteropolysaccharides,OC and OPN expression was upregulated and a higher degree of calcified matrix formation was observed.Combination with hyaluronan and chondroitin improved both the biophysical properties and the biological response of enzymatically crosslinked gelatin,fastening bone deposition.展开更多
Objective:Due to the many negative properties of sodium hypochlorite used in current root canal treatment,interest in biocompatible natural agents is increasing day by day.The aim of this study was to evaluate whether...Objective:Due to the many negative properties of sodium hypochlorite used in current root canal treatment,interest in biocompatible natural agents is increasing day by day.The aim of this study was to evaluate whether various extract solutions of Sapindus mukorossi have dissolution effects on human pulp tissues.Methods:Primarily powder extracts were obtained by extracting fruit shells of S.mukorossi in different solvents(ethanol,methanol,buthanol and distilled water).The test solutions were prepared and randomly separated into six groups with 10 samples in each group:ethanol extract,methanol extract,butanol extract,distilled water extract of S.mukorossi,sodium hypochlorite(Na OCl)and the control group.Among these,S.mukorossi extracts were separated into two subgroups,depending on their concentration level(50μg/m L and 100μg/m L).The pulp tissues of freshly extracted human molars were used for dissolution test.The weights of the pulpal tissues were measured and recorded for two times after the samples were placed in the solutions.Statistical analysis for all descriptive statistics was performed using SPSS 22(P<0.05).Results:Our results showed that maximum percent yield of preparation was obtained in methanol extract of S.mukorossi.Among all of the groups,the best dissolution capacity was seen in the Na OCl group(positive control group).Among S.mukorossi groups,the best tissue solvent solution was found in SMM group at 50μg/m L and SMB group at 100μg/m L.Conclusion:The different extracts of S.mukorossi had a capacity to dissolve pulp tissue but this capacity was less than Na OCl.Therefore,further studies will enable the creation of a commercial solution for clinical use by increasing the effectiveness of S.mukorossi while combining it with other endodontic irrigation solutions.展开更多
Stem cells are pluripotent cells, having a property of differentiating into various types of cells of human body. Several studies have developed mesenchymal stem cells(MSCs) from various human tissues,peripheral blood...Stem cells are pluripotent cells, having a property of differentiating into various types of cells of human body. Several studies have developed mesenchymal stem cells(MSCs) from various human tissues,peripheral blood and body fluids. These cells are then characterized by cellular and molecular markers to understand their specific phenotypes. Dental pulp stem cells(DPSCs) are having a MSCs phenotype and they are differentiated into neuron, cardiomyocytes, chondrocytes, osteoblasts, liver cells and β cells of islet of pancreas. Thus, DPSCs have shown great potentiality to use in regenerative medicine for treatment of various human diseases including dental related problems. These cells can also be developed into induced pluripotent stem cells by incorporation of pluripotency markers and use for regenerative therapies of various diseases. The DPSCs are derived from various dental tissues such as human exfoliated deciduous teeth, apical papilla, periodontal ligament and dental follicle tissue. This review will overview the information about isolation, cellular and molecular characterization and differentiation of DPSCs into various types of human cells and thus these cells have important applications in regenerative therapies for various diseases. This review will be most useful for postgraduate dental students as well as scientists working in the field of oral pathology and oral medicine.展开更多
基金Supported by the Science and Technology Programme of Guangzhou City,No.202201020341.
文摘BACKGROUND The self-assembly of solid organs from stem cells has the potential to greatly expand the applicability of regenerative medicine.Stem cells can self-organise into microsized organ units,partially modelling tissue function and regeneration.Dental pulp organoids have been used to recapitulate the processes of tooth development and related diseases.However,the lack of vasculature limits the utility of dental pulp organoids.AIM To improve survival and aid in recovery after stem cell transplantation,we demonstrated the three-dimensional(3D)self-assembly of adult stem cell-human dental pulp stem cells(hDPSCs)and endothelial cells(ECs)into a novel type of spheroid-shaped dental pulp organoid in vitro under hypoxia and conditioned medium(CM).METHODS During culture,primary hDPSCs were induced to differentiate into ECs by exposing them to a hypoxic environment and CM.The hypoxic pretreated hDPSCs were then mixed with ECs at specific ratios and conditioned in a 3D environment to produce prevascularized dental pulp organoids.The biological characteristics of the organoids were analysed,and the regulatory pathways associated with angiogenesis were studied.RESULTS The combination of these two agents resulted in prevascularized human dental pulp organoids(Vorganoids)that more closely resembled dental pulp tissue in terms of morphology and function.Single-cell RNA sequencing of dental pulp tissue and RNA sequencing of Vorganoids were integrated to analyse key regulatory pathways associated with angiogenesis.The biomarkers forkhead box protein O1 and fibroblast growth factor 2 were identified to be involved in the regulation of Vorganoids.CONCLUSION In this innovative study,we effectively established an in vitro model of Vorganoids and used it to elucidate new mechanisms of angiogenesis during regeneration,facilitating the development of clinical treatment strategies.
基金This research project was supported by:a postdoctoral scholarship grant to A.C.from The Second Century Fund(C2F),Chulalongkorn Universitya Mid-career Research Grant to J.N.F.from the National Research Council of Thailand(NRCT5-RSA63001-12)+3 种基金a training support grant to C.A.from the National Medical Research Council Singapore(NMRC/CNIG/1131/2015)a research grant to J.N.F./R.C./S.Y.for the Avatar Biotechnologies for Oral Health and Healthy Longevity Research Unit,from Ratchadaphiseksomphot Endowment Fund at Chulalongkorn University(33/2565:RU)an internal grant from the Faculty of Dentistry Chulalongkorn University,grant number DRF 65001 to J.N.F.,S.Y.and R.C.and a grant from Mahidol University(Basic Research Fund:fiscal year 2021)to S.R..We would like to give a special thanks to Oral Biology Research Center,Faculty of Dentistry,Chulalongkorn University,Dr.Chatvadee Kornsuthisopon for providing the hDPSC conditioned media for western blotting and to Dr.Muttarin Lothong for all technical assistance.
文摘Salivary glands(SG)are exocrine organs with secretory units commonly injured by radiotherapy.Bio-engineered organoids and extracellular vesicles(EV)are currently under investigation as potential strategies for SG repair.Herein,three-dimensional(3D)cultures of SG functional organoids(SGo)and human dental pulp stem cells(hDPSC)were generated by magnetic 3D bioassembly(M3DB)platforms.Fibroblast growth factor 10(FGF10)was used to enrich the SGo in secretory epithelial units.After 11 culture days via M3DB,SGo displayed SG-specific acinar epithelial units with functional properties upon neurostimulation.To consistently develop 3D hDPSC in vitro,3 culture days were sufficient to maintain hDPSC undifferentiated genotype and phenotype for EV generation.EV isolation was performed via sequential centrifugation of the conditioned media of hDPSC and SGo cultures.EV were characterized by nanoparticle tracking analysis,electron microscopy and immunoblotting.EV were in the exosome range for hDPSC(diameter:88.03±15.60 nm)and for SGo(123.15±63.06 nm).Upon ex vivo administration,exosomes derived from SGo significantly stimulated epithelial growth(up to 60%),mitosis,epithelial progenitors and neuronal growth in injured SG;however,such biological effects were less distinctive with the ones derived from hDPSC.Next,these exosome biological effects were investigated by proteomic arrays.Mass spectrometry profiling of SGo exosomes predicted that cellular growth,development and signaling was due to known and undocumented molecular targets downstream of FGF10.Semaphorins were identified as one of the novel targets requiring further investigations.Thus,M3DB platforms can generate exosomes with potential to ameliorate SG epithelial damage.
基金supported by the National Natural Science Foundation of China,Nos.81971870 and 82172173 (both to ML)。
文摘Human dental pulp stem cells(hDPSCs) promote recovery after ischemic stro ke;however,the therapeutic efficacy is limited by the poor survival of transplanted cells.For in vitro expe riments in the present study,we used oxygen-glucose deprivation/reoxygenation in hDPSCs to mimic cell damage induced by ischemia/reperfusion.We found that miRNA-34a-5p(miR-34a) was elevated under oxygen-glucose deprivation/reoxygenation conditions in hDPSCs.Inhibition of miR-34a facilitated the prolife ration and antioxidant capacity and reduced the apoptosis of hDPSCs.Moreove r,dual-luciferase reporter gene assay showed WNT1and SIRT1 as the targets of miR-34a.In miR-34a knockdown cell lines,WNT1 suppression reduced cell prolife ration,and SIRT1 suppression decreased the antioxidant capacity.Togethe r,these results indicated that miR-34a regulates cell prolife ration and antioxidant stress via targeting WNT1 and SIRT1,respectively.For in vivo expe riments,we injected genetically modified hDPSCs(anti34a-hDPSCs) into the brains of mice.We found that anti34a-hDPSCs significantly inhibited apoptosis,reduced cerebral edema and cerebral infarct volume,and improved motor function in mice.This study provides new insights into the molecular mechanism of the cell prolife ration and antioxidant capacity of hDPSCs,and suggests a potential gene that can be targeted to improve the survival rate and efficacy of transplanted hDPSCs in brain after ischemic stroke.
基金supported by the National Science Fund for Excellent Young Scholars(T2122019)the National Natural Science Foundation of China(51973096,51773097)+4 种基金the Natural Science Foundation of Tianjin City(18JCYBJC27000)the Technology Research and Development Program of Tianjin(20YFZCSY00830)the Tianjin Key Medical Discipline(Specialty)Construction Project(2021-516)the Science and Technology Project of Tianjin Health Commission(ZD20016)the Key Laboratory of Bioactive Materials,Ministry of Education(NKBM-2019-001,NKBM-2019-002).
文摘Amelogenin can induce odontogenic differentiation of human dental pulp cells(HDPCs),which has great potential and advantages in dentine-pulp complex regeneration.However,the unstability of amelogenin limits its further application.This study constructed amelogenin self-assembling peptide hydrogels(L-gel or D-gel)by heating-cooling technique,investigated the effects of these hydrogels on the odontogenic differentiation of HDPCs and explored the underneath mechanism.The critical aggregation concentration,conformation,morphology,mechanical property and biological stability of the hydrogels were characterized,respectively.The effects of the hydrogels on the odontogenic differentiation of HDPCs were evaluated via alkaline phosphatase activity measurement,quantitative reverse transcription polymerase chain reaction,western blot,Alizarin red staining and scanning electron microscope.The mechanism was explored via signaling pathway experiments.Results showed that both the L-gel and D-gel stimulated the odontogenic differentiation of HDPCs on both Day 7 and Day 14,while the D-gel showed the highest enhancement effects.Meanwhile,the D-gel promoted calcium accumulation and mineralized matrix deposition on Day 21.The D-gel activated MAPK-ERK1/2 pathways in HDPCs and induced the odontogenic differentiation via ERK1/2 and transforming growth factor/smad pathways.Overall,our study demonstrated that the amelogenin peptide hydrogel stimulated the odontogenic differentiation and enhanced mineralization,which held big potential in the dentine-pulp complex regeneration.
文摘Bone morphogenetic protein (BMP) can promote the proliferation of dental pulp cells and induce reparative dentin formation. In this study, the inductive effect of BMP derived from bovine bone matrix on cultured human dental pulp tissue was observed under light microscope and transmission electron microscope. The results showed that. by the third day of culture, the proliferating star-shaped cells appeared with small cytoplasm and poorly-developed organelles; by the 7th day of the culture, the chondroblast-like cells with rich cytoplasm and well-developed organelles were seen embedded in hyaline matrix. This study suggests that BMP can induce dental pulp cells to differentiate from poorly differentiated state to well-differentiated state.
文摘Plants have been used for medicinal purposes for thousands of years but they are still finding new uses in modem times. For example, Elaeagnus angustifolia (EA) is a medicinal herb with antinociceptive, anti-inflammatory, antibacterial and antioxidant properties and it is widely used in the treatment of rheumatoid arthritis and osteoarthritis. EA extract was loaded onto poly(ε-caprolactone)- poly(ethylene glycol)-poly(ε-caprolactone)(PCLPEG-PCL/EA) nanofibers and their potential applications for bone tissue engineering were studied. The morphology and chemical properties of the fibers were evaluated using Fourier transform infrared spectroscopy, field emission scanning electron microscopy, contact angle measurements and mechanical tests. All the samples had bead-free morphologies with average diameters ranging from 100 to 200 nm. The response of human cells to the PCL-PEGPCL/ EA nanofibers was evaluated using human dental pulp stem cells (hDPSCs). The hDPSCs had better adhesion and proliferation capacity on the EA loaded nanofibers than on the pristine PCL-PEG?PCL nanofibers. An alizarin red S assay and the alkaline phosphatase activity confirmed that the nanofibrous scaffolds induced osteoblastic performance in the hDPSCs. The quantitative real time polymerase chain reaction results confirmed that the EA loaded nanofibrous scaffolds had significantly upregulated gene expression correlating to osteogenic differentiation. These results suggest that PCL-PEG-PCL/ EA nanofibers might have potential applications for bone tissue engineering.
基金This work was supported by Dipartimento di Medicina Sperimentale(Universita` della Campania“Luigi Vanvitelli”)-Progetti di ricerca scientifica di dipartimento anno 2018,Scientific research funding (2018)entitled“Novel biomaterials and stem cells for bone regener ation”.
文摘Gelatin hydrogels by microbial-transglutaminase crosslinking are being increasingly exploited for tissue engineering,and proved high potential in bone regeneration.This study aimed to evaluate,for the first time,the combination of enzymatically crosslinked gelatin with hyaluronan and the newly developed biotechnological chondroitin in enhancing osteogenic potential.Gelatin enzymatic crosslinking was carried out in the presence of hyaluronan or of a hyaluronan–chondroitin mixture,obtaining semi-interpenetrating gels.The latter proved lower swelling extent and improved stiffness compared to the gelatin matrix alone,whilst maintaining high stability.The heteropolysaccharides were retained for 30 days in the hydrogels,thus influencing cell response over this period.To evaluate the effect of hydrogel composition on bone regeneration,materials were seeded with human dental pulp stem cells and osteogenic differentiation was assessed.The expression of osteocalcin(OC)and osteopontin(OPN),both at gene and protein level,was evaluated at 7,15 and 30 days of culture.Scanning electron microscopy(SEM)and two-photon microscope observations were performed to assess bone-like extracellular matrix(ECM)deposition and to observe the cell penetration depth.In the presence of the heteropolysaccharides,OC and OPN expression was upregulated and a higher degree of calcified matrix formation was observed.Combination with hyaluronan and chondroitin improved both the biophysical properties and the biological response of enzymatically crosslinked gelatin,fastening bone deposition.
基金supported by from the Scientific and Technological Research Council of Turkey(TUBITAK),project No.215S627。
文摘Objective:Due to the many negative properties of sodium hypochlorite used in current root canal treatment,interest in biocompatible natural agents is increasing day by day.The aim of this study was to evaluate whether various extract solutions of Sapindus mukorossi have dissolution effects on human pulp tissues.Methods:Primarily powder extracts were obtained by extracting fruit shells of S.mukorossi in different solvents(ethanol,methanol,buthanol and distilled water).The test solutions were prepared and randomly separated into six groups with 10 samples in each group:ethanol extract,methanol extract,butanol extract,distilled water extract of S.mukorossi,sodium hypochlorite(Na OCl)and the control group.Among these,S.mukorossi extracts were separated into two subgroups,depending on their concentration level(50μg/m L and 100μg/m L).The pulp tissues of freshly extracted human molars were used for dissolution test.The weights of the pulpal tissues were measured and recorded for two times after the samples were placed in the solutions.Statistical analysis for all descriptive statistics was performed using SPSS 22(P<0.05).Results:Our results showed that maximum percent yield of preparation was obtained in methanol extract of S.mukorossi.Among all of the groups,the best dissolution capacity was seen in the Na OCl group(positive control group).Among S.mukorossi groups,the best tissue solvent solution was found in SMM group at 50μg/m L and SMB group at 100μg/m L.Conclusion:The different extracts of S.mukorossi had a capacity to dissolve pulp tissue but this capacity was less than Na OCl.Therefore,further studies will enable the creation of a commercial solution for clinical use by increasing the effectiveness of S.mukorossi while combining it with other endodontic irrigation solutions.
基金Supported by Jaslok Hospital and Research Centre,Mumbai,India,Project ni491,A/C 27814
文摘Stem cells are pluripotent cells, having a property of differentiating into various types of cells of human body. Several studies have developed mesenchymal stem cells(MSCs) from various human tissues,peripheral blood and body fluids. These cells are then characterized by cellular and molecular markers to understand their specific phenotypes. Dental pulp stem cells(DPSCs) are having a MSCs phenotype and they are differentiated into neuron, cardiomyocytes, chondrocytes, osteoblasts, liver cells and β cells of islet of pancreas. Thus, DPSCs have shown great potentiality to use in regenerative medicine for treatment of various human diseases including dental related problems. These cells can also be developed into induced pluripotent stem cells by incorporation of pluripotency markers and use for regenerative therapies of various diseases. The DPSCs are derived from various dental tissues such as human exfoliated deciduous teeth, apical papilla, periodontal ligament and dental follicle tissue. This review will overview the information about isolation, cellular and molecular characterization and differentiation of DPSCs into various types of human cells and thus these cells have important applications in regenerative therapies for various diseases. This review will be most useful for postgraduate dental students as well as scientists working in the field of oral pathology and oral medicine.
