Open Access

The clinicopathological significance of lamin A/C, lamin B1 and lamin B receptor mRNA expression in human breast cancer

  • Umar Wazir1, 2,
  • Mai Hassan Ahmed3, 4,
  • Joanna M. Bridger3,
  • Amanda Harvey4,
  • Wen G. Jiang5,
  • Anup K. Sharma1 and
  • Kefah Mokbel1, 2, 6Email author
Cellular & Molecular Biology LettersAn International Journal201318:109

https://doi.org/10.2478/s11658-013-0109-9

Received: 23 June 2013

Accepted: 25 November 2013

Published: 30 November 2013

Abstract

Lamin A/C (LMNA), lamin B1 (LMNB1) and lamin B receptor (LBR) have key roles in nuclear structural integrity and chromosomal stability. In this study, we have studied the relationships between the mRNA expressions of A-type lamins, LMNB1 and LBR and the clinicopathological parameters in human breast cancer. Samples of breast cancer tissues (n = 115) and associated non-cancerous tissue (ANCT; n = 30) were assessed using reverse transcription and quantitative PCR. Transcript levels were correlated with clinicopathological data. Higher levels of A-type lamins and LMNB1 mRNA expression were seen in ANCT. Higher lamin A/C expression was associated with the early clinical stage (TNM1 vs. TNM3 — 13 vs. 0.21; p = 0.0515), with better clinical outcomes (disease-free survival vs. mortality — 11 vs. 1; p = 0.0326), and with better overall (p = 0.004) and disease-free survival (p = 0.062). The expression of LMNB1 declined with worsening clinical outcome (disease-free vs. mortalities — 0.0011 vs. 0.000; p = 0.0177). LBR mRNA expression was directly associated with tumor grade (grade 1 vs. grade 3 — 0.00 vs. 0.00; p = 0.0479) and Nottingham Prognostic Index (NPI1 vs. NPI3 — 0.00 vs. 0.00; p = 0.0551). To the best of our knowledge, this is the first study to suggest such a role for A-type lamins, lamin B1 and LBR in human breast cancer, identifying an important area for further research.

Key words

Lamin A/CLamin BLamin B receptorBreast cancerqPCRChromosomal instabilityCell senescenceCell cycleDNA repairAgeing

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