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Araujo TG, Marangoni K, Rocha RM, Maia YCP, Araujo GR, Alcântar TM, Alves PT, Calábria L, Neves AF, Soares FA, Goulart LR. Dynamic dialog between cytokeratin 18 and annexin A1 in breast cancer: a transcriptional disequilibrium. Acta Histochem 2014; 116:1178-84. [PMID: 25028131 DOI: 10.1016/j.acthis.2014.06.008] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2014] [Revised: 06/19/2014] [Accepted: 06/23/2014] [Indexed: 11/30/2022]
Abstract
Cytokeratins (CKs) constitute the cytoskeletal network and are regulated by post-translational modifications, acting not only as a mechanical support, but also in cell signaling and regulatory processes. Signaling is mediated by CK-associated proteins, such as Annexin A1 (ANXA1), a ligand of the CK18/CK8 complex. ANXA1 has a pivotal role in cellular and immunological responses, and together with CK18 have been implicated in several processes related to malignant transformation in breast cancer (BC). Our aim was to demonstrate how their interaction might be linked to BC development. We investigated transcript levels, protein expression and distribution for both targets in breast tissues of 92 patients (42 BCs and 50 benign diseases) using qPCR and immunohistochemistry, respectively. ANXA1 and CK18 mRNAs were inversely correlated, and their ratio in each TNM stage significantly differentiated BC from benign diseases (OR=5.62). These differences did not mirror tissue protein levels, but a significant dichotomous protein distribution in tumor tissues was observed, differing from the expected co-localization observed during cell homeostasis. The disequilibrium of transcriptional levels between ANXA1/CK18 and alterations in their tissue distribution are present either in initial events or tumor progression, which suggest a critical event in BC. The broken dialog between ANXA1 and CK18 in normal breast tissues may play a critical role in BC development, and together may be used as combined targets for BC diagnostics.
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Affiliation(s)
- Thaise G Araujo
- Laboratory of Nanobiotechnology, Institute of Genetics and Biochemistry, Federal University of Uberlandia, Uberlandia, MG, Brazil.
| | - Karina Marangoni
- Laboratory of Nanobiotechnology, Institute of Genetics and Biochemistry, Federal University of Uberlandia, Uberlandia, MG, Brazil
| | | | - Yara C P Maia
- School of Medicine, Federal University of Uberlandia, Uberlandia, MG, Brazil
| | - Galber R Araujo
- Laboratory of Nanobiotechnology, Institute of Genetics and Biochemistry, Federal University of Uberlandia, Uberlandia, MG, Brazil
| | - Tânia M Alcântar
- Department of Pathology, Clinical Hospital of Uberlandia, Federal University of Uberlandia, Uberlandia, MG, Brazil
| | - Patrícia T Alves
- Laboratory of Nanobiotechnology, Institute of Genetics and Biochemistry, Federal University of Uberlandia, Uberlandia, MG, Brazil
| | - Luanda Calábria
- Obstetrics Division, Internal Medicine, University Hospital, Federal University of Uberlandia, Uberlandia, MG, Brazil
| | - Adriana F Neves
- Laboratory of Genetics and Biotechnology, Federal University of Goias, Catalao, GO, Brazil
| | | | - Luiz R Goulart
- Laboratory of Nanobiotechnology, Institute of Genetics and Biochemistry, Federal University of Uberlandia, Uberlandia, MG, Brazil; Department of Medical Microbiology and Immunology, University of California Davis, Davis, CA, USA
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