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Journal of Dental Research
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Gene Expression in a Pure Population of Odontoblasts Isolated by Laser-capture Microdissection

M. Hoffmann

'Department of Orthodontics, University of Texas at Houston Health Science Center, Dental Branch, Room 370, 6516 M.D. Anderson Blvd., Houston, TX 77030, Department of Operative Dentistry and Periodontology, University of Regensburg, Germany

K. Olson

'Department of Orthodontics, University of Texas at Houston Health Science Center, Dental Branch, Room 370, 6516 M.D. Anderson Blvd., Houston, TX 77030

A. Cavender

'Department of Orthodontics, University of Texas at Houston Health Science Center, Dental Branch, Room 370, 6516 M.D. Anderson Blvd., Houston, TX 77030

R. Pasqualini

Department of Genitourinary Oncology, University of Texas, M.D. Anderson Cancer Center, Houston

J. Gaikwad

'Department of Orthodontics, University of Texas at Houston Health Science Center, Dental Branch, Room 370, 6516 M.D. Anderson Blvd., Houston, TX 77030

R.N. D'Souza

'Department of Orthodontics, University of Texas at Houston Health Science Center, Dental Branch, Room 370, 6516 M.D. Anderson Blvd., Houston, TX 77030

Studies of odontoblast differentiation and function have been limited due to difficulties in obtaining sufficient numbers of intact cells. We describe a novel approach of laser-capture microdissection to obtain homogenous populations of pre-odontoblasts and odontoblasts from tissue sections of mouse molar cusp tips. Fixation, processing, and staining conditions were assessed for the optimal retrieval of total RNA from microdissected odontoblasts. Fluorometric assays and RT-PCR analysis of {alpha}1(I) collagen, dentin sialophosphoprotein (Dspp), and osteocalcin (OC) confirmed that the total RNA from three-day-old captured odontoblasts was sufficient in quantity and quality. Odontoblast-specific gene expression was studied by RT-PCR analysis performed in a single streptavidin-coated tube. At E15.5, Days 0 and 3, gene expression in laser-captured odontoblasts resembled that seen in vivo by in situ hybridization. The use of LCM is thus a valuable means of retrieving quality RNA from discrete populations of odontoblasts at different stages of dentinogenesis.

Key Words: laser microdissection • odontoblasts • dentin matrix • gene expression.

Journal of Dental Research, Vol. 80, No. 11, 1963-1967 (2001)
DOI: 10.1177/00220345010800110301
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