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Laser Microdissection for Gene Expression Study of Hepatocellular Carcinomas Arising in Cirrhotic and Non-Cirrhotic Livers

  • Maria TretiakovaEmail author
  • John Hart
Protocol
Part of the Methods in Molecular Biology book series (MIMB, volume 755)

Abstract

Laser microdissection (LMD) is a robust well-established technology for the isolation of chosen cell populations from surrounding tissues and cells. This technique is particularly useful to minimize bias inherent in the molecular analysis of highly heterogeneous whole tissue sections. The aim of this study was to identify the pattern of mRNA expression in hepatocellular carcinoma (HCC) arising in cirrhotic liver and compare it to the pattern of expression in HCC arising from non-cirrhotic liver. The expression profiles of the tumors were also compared to that of the surrounding liver (either cirrhotic or non-cirrhotic) from the same patient. In addition, the expression pattern of each of the four tissues were compared to normal hepatic tissue. Samples of HCC tissue and surrounding cirrhotic or non-cirrhotic parenchyma were collected at the time of resection or liver transplantation. The samples were snap frozen and stored at −80°C. The snap frozen samples were then cryosectioned and stained with hematoxylin and eosin for LMD. Hepatocytes from each sample were collected using the Leica LMD instrument. The RNA was extracted according to standard methodology and amplified. Microarray analysis was performed using the Affymetrix human genome array platform. The resulting microarray data were analyzed using Affymetrix Microarray Suite 5.0 (MAS 5.0). Results were displayed using Genespring, dChip, SAM, and GenMapp/MAPP Finder software. Validation studies on selected genes and proteins were performed utilizing RT-PCR and immunohistologic techniques.

Key words

Hepatocellular carcinoma Cirrhotic Non-cirrhotic Laser microdissection Gene expression 

Notes

Acknowledgments

We cordially thank Dr. Xinmin Li and Jian Zhou from the Functional Genomics Facility (University of Chicago) for their help in performing the Affymetrix Microarray experiments.

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Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  1. 1.Department of PathologyUniversity of ChicagoChicagoUSA

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