Martinez, Vanesa G., O'Neill, Sadhbh, Salimu, Josephine, Breslin, Susan, Clayton, Aled ![]() |
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Abstract
Neuromedin U (NmU) -a neuropeptide belonging to the neuromedin family– plays a substantial role in HER2-positive breast cancer, correlating with increased aggressiveness, resistance to HER2-targeted therapies and overall significantly poorer outcome for patients. However, the mechanism through which it exerts these effects remains unclear. To elucidate this, initially we used HER2-positive breast cancer cells stably over-expressing NmU. These cells and their released extracellular vesicles (EVs) had increased amounts of the immunosuppressive cytokine TGFβ1 and the lymphocyte activation inhibitor PD-L1. Furthermore, these cells also showed enhanced resistance to antibody-dependent cell cytotoxicity (ADCC) mediated by trastuzumab, indicating a role of NmU in enhancing immune evasion. All these features were also found in HER2-targeted drug-resistant cells which we previously found to express higher levels of NmU than their drug-sensitive counterparts. Interestingly, EVs from drug-resistant cells were able to increase levels of TGFβ1 in drug-sensitive cells. In our neo-adjuvant clinical trial, TGFβ1 levels were significantly higher in EVs isolated from the serum of patients with HER2-overexpressing breast cancers who went on to not respond to HER2-targeted drug treatment, compared to those who experienced complete or partial response. Taken together, our results report a new mechanism-of-action for NmU in HER2-overexpressing breast cancer that enhances resistance to the anti-tumour immune response. Furthermore, EV levels of TGFβ1 correlating with patients' response versus resistance to HER2-targeted drugs suggests a potential use of EV-TGFβ1 as a minimally-invasive companion diagnostic for such treatment in breast cancer.
Item Type: | Article |
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Date Type: | Publication |
Status: | Published |
Schools: | Medicine |
Publisher: | Taylor & Francis |
ISSN: | 2162-4011 |
Date of First Compliant Deposit: | 18 October 2017 |
Date of Acceptance: | 28 July 2017 |
Last Modified: | 17 May 2023 10:56 |
URI: | https://orca.cardiff.ac.uk/id/eprint/103801 |
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