Doxycycline-doped membranes induced osteogenic gene expressi
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Doxycycline doped membranes may be a potential candidate for use in Guided bone regeneration (GBR) procedures in several challenging pathologies, including periodontal diseases.

The study was aimed to analyze how the novel developed silicon dioxide composite membranes, functionalized with zinc or doxycycline, can modulate the expression of genes related to the osteogenic functional capacity of osteoblastic cells.

The composite nanofibers membranes were manufactured by using a novel polymeric blend and 20 nm silicon dioxide nanoparticles (SiO2-NPs). To manufacture the membranes, 20 nm SiO2-NPs were added to the polymer solution, and the resulting suspension was processed by electrospinning. In a second step, the membranes were functionalized with zinc or doxycycline. Then, they were subjected to MG63 osteoblast-like cells culturing for 48h. After this time, a real-time quantitative polymerase chain reaction (RT-qPCR) was carried out to study the expression of Runx-2, OSX, ALP, OSC, OPG, RANKL, Col-I, BMP-2, BMP-7, TGF-β1, VEGF, TGF-βR1, TGF- βR2, and TGF-βR3. Mean comparisons were conducted by one-way ANOVA and Tukey tests.

--In general, the blending of SiO2-NPs in the tested non-resorbable polymeric scaffold improves the expression of osteogenic genes over the control membranes.

--Doxycycline doping of experimental scaffolds attained the best results, encountering up-regulation of BMP-2, ALP, OPG, TGFβ-1, and TGFβ-R1.

--Membranes with zinc induced a significant increase in the expression of Col-I, ALP, and TGF β1.

--Both zinc and doxycycline functionalized membranes enormously down-regulated the expression of RANKL.

Conclusively, zinc and doxycycline doped membranes are bioactive inducing overexpression of several osteogenic gene markers.

Journal of Dentistry