Lamin A/C is a risk biomarker in colorectal cancer.

PloS One
Naomi D WillisC J Hutchison

Abstract

A-type lamins are type V intermediate filament proteins encoded by the gene LMNA. Mutations in LMNA give rise to diverse degenerative diseases related to premature ageing. A-type lamins also influence the activity of the Retinoblastoma protein (pRb) and oncogenes such a beta-catenin. Consequently, it has been speculated that expression of A-type lamins may also influence tumour progression. An archive of colorectal cancer (CRC) and normal colon tissue was screened for expression of A-type lamins. We used the Cox proportional hazard ratio (HR) method to investigate patient survival. Using CRC cell lines we investigated the effects of lamin A expression on other genes by RT-PCR; on cell growth by FACS analysis; and on invasiveness by cell migration assays and siRNA knockdown of targeted genes. We found that lamin A is expressed in colonic stem cells and that patients with A-type lamin-expressing tumours have significantly worse prognosis than patients with A-type lamin negative tumours (HR = 1.85, p = 0.005). To understand this finding, we established a model system based upon expression of GFP-lamin A in CRC cells. We found that expression of GFP-lamin A in these cells did not affect cell proliferation but did promote greatly in...Continue Reading

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Methods Mentioned

BETA
transfection
flow cytometry
X-ray
PCR
fluorescence microscopy

Software Mentioned

SPSS
Zeiss Axiovision
BLASTN
FlowJo
LaserSharp
Image Gauge
Zeiss LSM Image Browser

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