title: Enhanced dentin-like mineralized tissue formation by AdShh-transfected human dental pulp cells and porous calcium phosphate cement.
abstract: The aim of the present study was to investigate the effect of Sonic hedgehog (Shh) on human dental pulp cells (hDPCs) and the potential of complexes with Shh gene modified hDPCs and porous calcium phosphate cement (CPC) for mineralized tissue formation. hDPCs were cultured and transfected with adenoviral mediated human Shh gene (AdShh). Overexpression of Shh and cell proliferation was tested by real-time PCR analysis, western blotting analysis, and MTT analysis, respectively. The odontoblastic differentiation was assessed by alkaline phosphatase (ALP) activity and real-time PCR analysis on markers of Patched-1 (Ptc-1), Smoothened (Smo), Gli 1, Gli 2, Gli 3, osteocalcin (OCN), dentin matrix protein-1 (DMP-1), and dentin sialophosphoprotein (DSPP). Finally, AdShh-transfected hDPCs were combined with porous CPC and placed subcutaneously in nude mice for 8 and 12 weeks, while AdEGFP-transfected and untransfected hDPCs were treated as control groups. Results indicated that Shh could promote proliferation and odontoblastic differentiation of hDPCs, while Shh/Gli 1 signaling pathway played a key role in this process. Importantly, more mineralized tissue formation was observed in combination with AdShh transfected hDPCs and porous CPC, moreover, the mineralized tissue exhibited dentin-like features such as structures similar to dentin-pulp complex and the positive staining for DSPP protein similar to the tooth tissue. These results suggested that the constructs with AdShh-transfected hDPCs and porous CPC might be a better alternative for dental tissue regeneration.
authors.affiliation: Department of Oral and Maxillofacial Surgery, Shanghai Ninth People's Hospital Affiliated to Shanghai Jiao Tong University, School of Medicine, Shanghai, China.
authors.forename: Lunguo
authors.initials: L
authors.lastname: Xia
authors.forename: Maolin
authors.initials: M
authors.lastname: Zhang
authors.forename: Qing
authors.initials: Q
authors.lastname: Chang
authors.forename: Lizhen
authors.initials: L
authors.lastname: Wang
authors.forename: Deliang
authors.initials: D
authors.lastname: Zeng
authors.forename: Xiuli
authors.initials: X
authors.lastname: Zhang
authors.forename: Zhiyuan
authors.initials: Z
authors.lastname: Zhang
authors.forename: Xinquan
authors.initials: X
authors.lastname: Jiang
mesh_terms: D000256:Adenoviridae / Q000235:genetics; D000818:Animals; D002130:Calcium Phosphates / Q000737:chemistry; D002448:Cell Adhesion / Q000187:drug effects / Q000235:genetics; D002454:Cell Differentiation / Q000235:genetics; D049109:Cell Proliferation / Q000187:drug effects; D003739:Dental Cementum / Q000737:chemistry / Q000378:metabolism* / Q000648:ultrastructure; D003782:Dental Pulp / Q000166:cytology* / Q000378:metabolism*; D003804:Dentin / Q000378:metabolism*; D015870:Gene Expression; D005822:Genetic Vectors / Q000235:genetics; D048091:Guided Tissue Regeneration; D053823:Hedgehog Proteins / Q000235:genetics* / Q000378:metabolism; D006801:Humans; D051379:Mice; D009804:Odontoblasts / Q000166:cytology / Q000187:drug effects; D013997:Time Factors; D014074:Tooth Calcification / Q000187:drug effects / Q000235:genetics; D014161:Transduction, Genetic; D014162:Transfection; D014704:Veratrum Alkaloids / Q000494:pharmacology
chemical_list: D002130:Calcium Phosphates; D053823:Hedgehog Proteins; C509239:SHH protein, human; D014704:Veratrum Alkaloids; C000541:cyclopamine