hPDGF-B基因转染对Beagle犬牙龈成纤维细胞生物学活性的影响

Biological Effects of Human Platelet-Derived Growth Factor-B Gene Transfection on Gingival Fibroblasts of Beagle Dog

目的检测hPDGF-B基因转染对Beagle犬牙龈成纤维细胞生物学活性的影响。方法使用脂质体LipofectamineTM2000将携带hPDGF-B基因的质粒EX-A0380-M03转染至Beagle犬牙龈成纤维细胞,观察转染后细胞的形态以及增殖的变化;流式细胞仪检测转染细胞的周期以及凋亡情况;Real-time PCR法检测转染后细胞表达Collagen I、Collagen XII、α-SMA的变化。结果转染后的牙龈成纤维细胞形态多样,但增殖显著;转染组S期细胞比率增高,转染细胞未出现凋亡;转染后细胞上调Collagen I基因的表达,下调Collagen XII和α-SMA的表达。结论 hPDGF-B基因转染牙龈成纤维细胞后,产生PDGF-BB-eGFP融合蛋白,融合蛋白可能通过自分泌和旁分泌的方式作用于牙龈成纤维细胞,从而促进细胞增殖。hPDGF-B基因转染牙龈成纤维细胞后,细胞并不能出现逆向分化,细胞对外周基质的改建能力下降,但细胞合成胶原的能力显著增强。

Objective To evaluate the biological effects of human platelet-derived growth factor-B gene transfection on gingival fibroblasts . Methods The plasmid（EX-A0380-M03） carried human plate-let-derived growth factor-B（hPDGF-B） gene was transfected into gingival fibroblasts by LipofectamineTM 2000 . Morphological changes of transfected cells were recorded by optical and fluorescent microscope . Then ,MTT and flow cytometry were used to estimate the proliferation and apoptosis of gene-modified cells . The expression of collagen I and XII ,as well as theα-SMA（α-Smooth Muscle Actin） was detected by Real-time Quantitative PCR . Results Compared to the normal cells ,partial transfected cells presen-ted startlike ,polygonal ,and neuron-like . Cells proliferation was enhanced after gene interference ,but apoptosis did not appeared . At transcription level ,the expression of Collagen I was up-regulated ,while Collagen XII and α-SMA were down-regulated . Conclusion The enhanced proliferation of gingival fibro-blasts were due to paracrine and autocrine modes of fusion protein PDGF-BB-eGFP synthetized by gene modified cells . Transfeced cells did not present reverse differentiation ,and the extracellular matrix re-modeling ability of those cells were down . The synthesis of Collagen I of hPDGF-B gene modified cells ascended no tably .