Angiotensin-(1-7)/Mas receptor as an antinociceptive agent in cancer-induced bone pain
Author
Forte, Brittany L.Slosky, Lauren M.
Zhang, Hong
Arnold, Moriah R.
Staatz, William D.
Hay, Meredith
Largent-Milnes, Tally M.
Vanderah, Todd W.
Affiliation
Univ Arizona, Coll Med, Dept PharmacolUniv Arizona, Coll Med, Dept Physiol, Evelyn McKnight Brain Inst
Issue Date
2016-12
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LIPPINCOTT WILLIAMS & WILKINSCitation
Angiotensin-(1-7)/Mas receptor as an antinociceptive agent in cancer-induced bone pain 2016, 157 (12):2709 PAINJournal
PAINRights
This is an open access article distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND), which permits downloading and sharing the work provided it is properly cited. The work cannot be changed in any way or used commercially.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
Many cancerous solid tumors metastasize to the bone and induce pain (cancer-induced bone pain [CIBP]). Cancer-induced bone pain is often severe because of enhanced inflammation, rapid bone degradation, and disease progression. Opioids are prescribed to manage this pain, but they may enhance bone loss and increase tumor proliferation, further compromising patient quality of life. Angiotensin-(1-7) (Ang-(1-7)) binds and activates the Mas receptor (MasR). Angiotensin-(1-7)/MasR activation modulates inflammatory signaling after acute tissue insult, yet no studies have investigated whether Ang-(1-7)/MasR play a role in CIBP. We hypothesized that Ang-(1-7) inhibits CIBP by targeting MasR in a murine model of breast CIBP. 66.1 breast cancer cells were implanted into the femur of BALB/cAnNHsd mice as a model of CIBP. Spontaneous and evoked pain behaviors were assessed before and after acute and chronic administration of Ang-(1-7). Tissues were collected from animals for ex vivo analyses of MasR expression, tumor burden, and bone integrity. Cancer inoculation increased spontaneous pain behaviors by day 7 that were significantly reduced after a single injection of Ang-(1-7) and after sustained administration. Preadministration of A-779 a selective MasR antagonist prevented this reduction, whereas pretreatment with the AT(2) antagonist had no effect; an AT(1) antagonist enhanced the antinociceptive activity of Ang-(1-7) in CIBP. Repeated Ang-(1-7) administration did not significantly change tumor burden or bone remodeling. Data here suggest that Ang-(1-7)/MasR activation significantly attenuates CIBP, while lacking many side effects seen with opioids. Thus, Ang-(1-7) may be an alternative therapeutic strategy for the nearly 90% of patients with advanced-stage cancer who experience excruciating pain.Note
Open access article.ISSN
0304-3959PubMed ID
27541850Version
Final published versionSponsors
College of Medicine at the University of Arizona; NIH- NCI [R01 CA142115-01]Additional Links
http://content.wkhealth.com/linkback/openurl?sid=WKPTLP:landingpage&an=00006396-201612000-00011ae974a485f413a2113503eed53cd6c53
10.1097/j.pain.0000000000000690
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