| Purposes:When a patient uses anti-resorptive or anti-angiogenic medications,primarily Bisphosphates(BPs),it can lead to medication-related osteonecrosis of the jaw(MRONJ),which is defined by The key clinical characteristics of this condition include pathological fractures,exposed dead bone,and poor soft tissue healing.Patients experience discomfort and a poor quality of life as a result of the hardto-repair soft tissues and exposed dead bones.Surgical and non-surgical conservative therapy are the two major techniques frequently utilized to treat MRONJ.Non-surgical therapy,on the other hand,can only have a symptomrelieving impact and has a high recurrence rate.Thus,the current clinical activity is in urgent need of finding a solution to the issue of how to avoid the emergence of the disease from the root cause.The existence of these regional risk factors considerably raises the likelihood of MRONJ formation.The condition is frequently brought on by patients who were consuming or injecting drugs during the time of their dental extractions,dental implants,and other clinical-surgical procedures.If a scaffold material that can prevent MRONJ is implanted into the appropriate oral tissue breakdown,MRONJ may be prevented.By covalently joining gelatin methacryloyl(GelMA)and methacrylamide heparin(Hep MA)and adding platelet-rich fibrin(PRF)to the scaffold,this work intends to create a hydrogel scaffold that can contain growth factors.Finally,a photo cross-linked PRF-Hep MA/GelMA hydrogel with the gradual release of growth factors was created when fibrin(PRF)was loaded onto it.Using in vitro tests,the viability of this hydrogel as a tissue engineering scaffold material for MRONJ prevention was determined.Methods:1.By UV light(405 nm)irradiation,the PRF-Hep MA/GelMA hydrogel precursor solution was created,cross-linked,and then cured into gels.2.CCK-8 and live-dead cell staining methods were used to assess the biocompatibility of PRF-Hep MA/GelMA hydrogels.3.Screening of drug concentrations of ZOL by CCK-8.The effects of ZOL on MC3T3-E1 cell proliferation and osteogenic differentiation were evaluated by CCK-8,live-dead cell staining,ALP staining,alizarin red staining,and q RT-PCR.PRF-Hep MA/GelMA hydrogel was found to partially reverse these effects.Results:1.PRF-Hep MA/GelMA hydrogels were successfully made.MC3T3-E1 cells were co-cultured with four different hydrogel groups—GelMA,Hep MA/GelMA,PRF/GelMA,and PRF-Hep MA/GelMA—and the results of the experiment revealed that all of the groups of hydrogels had good biocompatibility.The PRF-Hep MA/GelMA group stood out among them for its capacity to encourage cell proliferation.2.CCK-8 was used to test the drug concentration of ZOL,and the results revealed that at day 5,2 mol/L ZOL considerably reduced the proliferation of MC3T3-E1 cells.CCK-8 and live-dead cell staining results showed that PRFHep MA/GelMA hydrogel could partially reverse the detrimental effects of ZOL on the proliferation of MC3T3-E1 cells;ALP,alizarin red,and q RT-PCR results showed that PRF-Hep MA/GelMA hydrogel was able to partially reverse the detrimental effects of ZOL on osteogenic differentiation of MC3T3-E1 cells.Conclusions:1.The hydrogel PRF-Hep MA/GelMA exhibits good biocompatibility.2.PRF-Hep MA/GelMA hydrogel can partially counteract ZOL’s inhibitory effect on MC3T3-E1 cells’ ability to proliferate and differentiate into osteogenic tissue.Hence,it is thought that MRONJ may be prevented by PRFHep MA/GelMA hydrogel. |
