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Kihara AH, Moriscot AS, Ferreira PJ, Hamassaki DE. Protecting RNA in fixed tissue: an alternative method for LCM users. J Neurosci Methods 2005; 148:103-7. [PMID: 16026852 DOI: 10.1016/j.jneumeth.2005.04.019] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2005] [Revised: 04/08/2005] [Accepted: 04/09/2005] [Indexed: 11/29/2022]
Abstract
RNA degradation is a major drawback in most common fixation protocols in techniques that require both RNA integrity and preserved morphology, such as laser capture microdissection (LCM) followed by RT-PCR. Moreover, RNA isolation kits especially developed for LCM samples are very expensive. Our aim was to determine an easy protocol that ideally must provide an acceptable morphology, allow proper laser capture of selected cells and improve RNA yield and quality. In this study, retinas were dissected, briefly incubated in a RNA preservative and fixed in 2% paraformaldehyde before being cut on a cryostat. LCM was carried out in retinal sections for immediate RNA isolation, by using TRIzol common protocol with minor modifications. Real-time PCR was performed next in order to compare availability of RNA from samples submitted to different protocols. The use of the RNA preservative followed by a fast fixation did not jeopardize tissue morphology, allowing microdissection of selected cells, combined to minor modifications in usual RNA isolation procedures, significantly improved RNA yield and quality. Furthermore, only LCM samples submitted to our protocol provided amplifiable mRNA, as determined by real-time PCR. Taken together, the combination of the described procedures resulted in a reliable alternative for LCM users.
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Affiliation(s)
- Alexandre Hiroaki Kihara
- Department of Physiology and Biophysics, Institute of Biomedical Sciences, University of São Paulo, Av. Prof. Lineu Prestes, 1524, 05508-900 São Paulo, SP, Brazil.
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Doolittle ND, Abrey LE, Bleyer WA, Brem S, Davis TP, Dore-Duffy P, Drewes LR, Hall WA, Hoffman JM, Korfel A, Martuza R, Muldoon LL, Peereboom D, Peterson DR, Rabkin SD, Smith Q, Stevens GH, Neuwelt EA. New Frontiers in Translational Research in Neuro-oncology and the Blood-Brain Barrier: Report of the Tenth Annual Blood-Brain Barrier Disruption Consortium Meeting. Clin Cancer Res 2005. [DOI: 10.1158/1078-0432.421.11.2] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
The blood-brain barrier (BBB) presents a major obstacle to the treatment of malignant brain tumors and other central nervous system (CNS) diseases. For this reason, a meeting partially funded by an NIH R13 grant was convened to discuss recent advances and future directions in translational research in neuro-oncology and the BBB. Cell biology and transport across the BBB, delivery of agents to the CNS, neuroimaging, angiogenesis, immunotherapy, and gene therapy, as well as glioma, primary CNS lymphoma, and metastases to the CNS were discussed. Transport across the BBB relates to the neurovascular unit, which consists not only of endothelial cells but also of pericyte, glia, and neuronal elements.
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Affiliation(s)
- Nancy D. Doolittle
- 1Department of Neurology, Oregon Health & Science University, Portland, Oregon
| | - Lauren E. Abrey
- 2Department of Neurology, Memorial Sloan-Kettering Cancer Center, New York, New York
| | - W. Archie Bleyer
- 3Divisions of Pediatrics and Community Oncology, M.D. Anderson Cancer Center, Houston, Texas
| | - Steven Brem
- 4Department of Neuro-oncology and Neurosurgery, H. Lee Moffitt Cancer Center, Tampa, Florida
| | - Thomas P. Davis
- 5Department of Pharmacology, Program in Neurosciences and Physiological Sciences, University of Arizona Medical School, Tucson, Arizona
| | - Paula Dore-Duffy
- 6Department of Neurology, Wayne State University, Detroit, Michigan
| | - Lester R. Drewes
- 7Department of Biochemistry and Molecular Biology, University of Minnesota School of Medicine, Duluth, Minnesota
| | - Walter A. Hall
- 8Department of Neurosurgery, University of Minnesota, Minneapolis, Minnesota
| | - John M. Hoffman
- 9National Cancer Institute, Cancer Imaging Program, Bethesda, Maryland
| | - Agnieszka Korfel
- 10Department of Hematology, Oncology, and Transfusion Medicine, Charite Campus Benjamin Franklin, Berlin, Germany
| | - Robert Martuza
- 11Department of Neurosurgery, Massachusetts General Hospital Neurosurgical Service, Harvard Medical School, Boston, Massachusetts
| | - Leslie L. Muldoon
- 1Department of Neurology, Oregon Health & Science University, Portland, Oregon
| | | | - Darryl R. Peterson
- 14Department of Physiology and Biophysics, Chicago Medical School, North Chicago, Illinois
| | - Samuel D. Rabkin
- 15Department of Neurosurgery, Massachusetts General Hospital-East Molecular Neurosurgery Laboratory, Harvard Medical School, Charlestown, Massachusetts; and
| | - Quentin Smith
- 16Department of Pharmaceutical Sciences, Texas Tech, Amarillo, Texas
| | - Glen H.J. Stevens
- 13Adult Neuro-oncology Brain Tumor Institute, Cleveland Clinic Foundation, Cleveland, Ohio
| | - Edward A. Neuwelt
- 1Department of Neurology, Oregon Health & Science University, Portland, Oregon
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Kellner U, Steinert R, Seibert V, Heim S, Kellner A, Schulz HU, Roessner A, Krüger S, Reymond M. Epithelial cell preparation for proteomic and transcriptomic analysis in human pancreatic tissue. Pathol Res Pract 2004; 200:155-63. [PMID: 15237924 DOI: 10.1016/j.prp.2004.03.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Standardized sample preparation procedures constitute a prerequisite for obtaining reliable and reproducible results in gene expression research in humans. In particular, in diseases such as pancreatic cancer and pancreatitis, isolating epithelial cells is an important step preceding such research. In pancreatic tissue, the high amount of RNAases is a further problem when it comes to obtaining high-quality RNA, and the presence of secreted proteases accelerates protein degradation. We developed a successful method that addresses these different problems. This method, which uses epithelial cell surface antibody Ber-Ep4, proteases, and RNAases inhibitors, leads to a significant enrichment (> 95% purity) of epithelial cells from fresh human tissue samples and allows for both proteomics (Western Blot, 2D PAGE) and transcriptomics studies (rtPCR, cDNA microarray). Compared with other cell purification procedures, this method is characterized by several advantages: a large quantity of cells available for downstream analysis, combined transcriptomics and proteomics studies using the same samples, better reproducibility of proteomics studies, and an acceptable yield (63%) for gene expression arrays studies. Moreover, a quality control protocol addressing the needs of the industry and the requirements of regulatory agencies is proposed.
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Affiliation(s)
- Udo Kellner
- Department of Pathology & Cytology, Klinikum Minden, Friedrichstrasse 17, 32427 Minden, Germany.
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