RESUMO
Autogenous bone transplantation is a prevalent clinical method for addressing bone defects. However, the limited availability of donor bone and the morbidity associated with bone harvesting have propelled the search for suitable bone substitutes. Bio-inspired scaffolds, particularly those fabricated using electron beam melting (EBM) deposition technology, have emerged as a significant advancement in this field. These 3D-printed titanium alloy scaffolds are celebrated for their outstanding biocompatibility and favorable elastic modulus. Thermosensitive chitosan hydrogel, which transitions from liquid to solid at body temperature, serves as a popular carrier in bone tissue engineering. Icariin (ICA), known for its efficacy in promoting osteoblast differentiation from bone marrow mesenchymal stem cells (BMSCs), plays a crucial role in this context. We developed a system combining a 3D-printed titanium alloy with a thermosensitive chitosan hydrogel, capable of local bone regeneration and integration through ICA delivery. Our in vitro findings reveal that this system can gradually release ICA, demonstrating excellent biocompatibility while fostering BMSC proliferation and osteogenic differentiation. Immunohistochemistry and Micro-CT analyses further confirm the effectiveness of the system in accelerating in vivo bone regeneration and enhancing osseointegration. This composite system lays a significant theoretical foundation for advancing local bone regeneration and integration.
Assuntos
Ligas , Diferenciação Celular , Quitosana , Flavonoides , Hidrogéis , Células-Tronco Mesenquimais , Osseointegração , Osteogênese , Impressão Tridimensional , Alicerces Teciduais , Titânio , Quitosana/química , Quitosana/farmacologia , Titânio/química , Osseointegração/efeitos dos fármacos , Ligas/química , Ligas/farmacologia , Alicerces Teciduais/química , Animais , Células-Tronco Mesenquimais/efeitos dos fármacos , Células-Tronco Mesenquimais/citologia , Osteogênese/efeitos dos fármacos , Hidrogéis/química , Hidrogéis/farmacologia , Diferenciação Celular/efeitos dos fármacos , Proliferação de Células/efeitos dos fármacos , Regeneração Óssea/efeitos dos fármacos , Engenharia Tecidual/métodosRESUMO
OBJECTIVE: To observe the effect of acupuncture at Renying (ST 9) on morning blood pressure, daytime peak blood pressure and 24-hour blood pressure load in patients with ischemic stroke complicated with essential hypertension. METHODS: A total of 80 patients (3 cases dropped off) were randomized into an observation group (39 cases) and a control group (38 cases). Xingnao Kaiqiao acupuncture and nifedipine were given in the control group. On the basis of treatment in the control group, acupuncture at Renying (ST 9) was applied in the observation group, once a day, 6 times a week for 4 weeks. The changes of morning blood pressure, daytime peak blood pressure and blood pressure load were observed before and after treatment in the two groups. RESULTS: Compared before treatment, morning blood pressure, daytime peak blood pressure and blood pressure load after treatment were reduced in the two groups (all P<0.05). The change of morning systolic pressure in the observation group was not significant as compared with that in the control group (P>0.05); the changes of morning diastolic pressure, daytime peak blood pressure and blood pressure load in the observation group were larger than those in the control group (all P<0.05). CONCLUSION: On the basis of Xingnao Kaiqiao acupuncture and nifedipine, acupuncture at Renying (ST 9) can effectively reduce morning blood pressure, daytime peak blood pressure and blood pressure load in patients with ischemic stroke complicated with essential hypertension.
