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Proceedings Paper

RT-PCR standardization and bone mineralization after low-level laser therapy on adult osteoblast cells
Author(s): Fernando Russo Costa do Bomfim; Valéria Regina Gonzalez Sella; Jéssica Querido Zanaga; Nayara Simionatto Pereira; Viviane Louise Andree Nouailhetas; Hélio Plapler M.D.
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Paper Abstract

Purpose: Osteoblasts are capable to produce different compounds directly connected to bone mineralization process. This study aims to standardize the reverse transcriptase polymerase chain reaction (RT-PCR) for adult osteoblasts to observe the effect of low level laser therapy on bone mineralization. Methods: Five-millimeter long fragments obtained from the mead femoral region of male Wistar rats were assigned into group A (n=10, laser) and group B (n=10, no laser), submitted to mechanic and enzymatic digestion. After 7 days, cultures of group A were irradiated daily on a single spot with a GaInAs laser, λ=808nm, 200mW/cm2, 2J/cm2, bean diameter of 0,02mm, 5 seconds for 6 days. Group B was manipulated but received no laser irradiation. After 13 days the cells were trypsinized for 15 minute and stabilized with RNA later® for RNA extraction with Trizol®. cDNA synthesis used 10μg of RNA and M-MLV® enzyme. PCR was accomplished using the β-actin gene as a control. Another aliquot was fixed for Hematoxylin-Eosin and Von Kossa staining to visualize bone mineralization areas. Results: Under UV light we observed clearly the amplification of β-actin gene around 400bp. HE and Von Kossa staining showed osteoblast clusters, a higher number of bone cells and well defined mineralization areas in group A. Conclusion: The cell culture, RNA extraction and RT-PCR method for adult osteoblasts was effective, allowing to use these methods for bone mineralization studies. Laser improved bone mineralization and further studies are needed involving osteogenesis, calcium release mechanisms and calcium related channels.

Paper Details

Date Published: 4 March 2014
PDF: 6 pages
Proc. SPIE 8926, Photonic Therapeutics and Diagnostics X, 89263S (4 March 2014); doi: 10.1117/12.2037340
Show Author Affiliations
Fernando Russo Costa do Bomfim, Univ. Federal de São Paulo (Brazil)
Valéria Regina Gonzalez Sella, Univ. Federal de São Paulo (Brazil)
Jéssica Querido Zanaga, UNIARARAS (Brazil)
Nayara Simionatto Pereira, UNIARARAS (Brazil)
Viviane Louise Andree Nouailhetas, Univ. Federal de São Paulo (Brazil)
Hélio Plapler M.D., Univ. Federal de São Paulo (Brazil)

Published in SPIE Proceedings Vol. 8926:
Photonic Therapeutics and Diagnostics X
Bernard Choi; Hyun Wook Kang; Brian J. F. Wong M.D.; Guillermo J. Tearney M.D.; Andreas Mandelis; Nikiforos Kollias; Kenton W. Gregory M.D.; Justus F. Ilgner M.D.; Haishan Zeng; Laura Marcu, Editor(s)

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