Resistance of Muscle to Tumor Metastases: A Role for A3 Adenosine Receptor Agonists
Tumor metastases are extremely rare in striated muscles. Lately, we have found that muscle cell conditioned medium (MCM) inhibits the proliferation of various tumor cells while maintaining the growth of normal murine bone marrow cells. This dual activity was confirmed in vivo when the MCM was admini...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2001-01-01
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| Series: | Neoplasia: An International Journal for Oncology Research |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1476558601800245 |
| _version_ | 1818236306043437056 |
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| author | Sara Bar-Yehuda Faina Barer Lea Volisson Pnina Fishman |
| author_facet | Sara Bar-Yehuda Faina Barer Lea Volisson Pnina Fishman |
| author_sort | Sara Bar-Yehuda |
| collection | DOAJ |
| description | Tumor metastases are extremely rare in striated muscles. Lately, we have found that muscle cell conditioned medium (MCM) inhibits the proliferation of various tumor cells while maintaining the growth of normal murine bone marrow cells. This dual activity was confirmed in vivo when the MCM was administered orally, i.e., it inhibited the development of tumor growth in mice and prevented the myelotoxic effects of chemotherapy. Adenosine was found to be one of the active components of MCM, inhibiting tumor cell growth while maintaining bone marrow cell proliferation in vitro. Adenosine is known to act as an important regulatory molecule through its binding to specific Gprotein-associated A1, A2a, A2b, and A3 cell surface receptors. In distinction from MCM, adenosine did not suppress tumor development in mice and was not active as a chemoprotective agent when administered orally or intravenously. Thus, the in vivo activity of MCM could not be attributed to adenosine. In this study, MCM from which adenosine was enzymatically removed still retained its dual activity that was also found to be mediated through the A3 adenosine receptor (A3AR). This result led to the conclusion that natural agonists to A3AR were responsible for the activity of MCM. We further tested synthetic agonist to the A3AR and demonstrated that it possessed the same in vitro and in vivo activity profile as MCM. Taken together, muscle cells, in addition to adenosine, secrete natural agonists to A3AR. These agonists are stable nondegradable molecules and may contribute to the systemic anticancer and chemoprotective activity exerted by MCM. This group of molecules may account for the rarity of tumor metastases in muscle. |
| first_indexed | 2024-12-12T12:07:46Z |
| format | Article |
| id | doaj.art-e97b266c893a4586bb23bd9cb7743189 |
| institution | Directory Open Access Journal |
| issn | 1476-5586 1522-8002 |
| language | English |
| last_indexed | 2024-12-12T12:07:46Z |
| publishDate | 2001-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Neoplasia: An International Journal for Oncology Research |
| spelling | doaj.art-e97b266c893a4586bb23bd9cb77431892022-12-22T00:24:58ZengElsevierNeoplasia: An International Journal for Oncology Research1476-55861522-80022001-01-013212513110.1038/sj.neo.7900138Resistance of Muscle to Tumor Metastases: A Role for A3 Adenosine Receptor AgonistsSara Bar-YehudaFaina BarerLea VolissonPnina FishmanTumor metastases are extremely rare in striated muscles. Lately, we have found that muscle cell conditioned medium (MCM) inhibits the proliferation of various tumor cells while maintaining the growth of normal murine bone marrow cells. This dual activity was confirmed in vivo when the MCM was administered orally, i.e., it inhibited the development of tumor growth in mice and prevented the myelotoxic effects of chemotherapy. Adenosine was found to be one of the active components of MCM, inhibiting tumor cell growth while maintaining bone marrow cell proliferation in vitro. Adenosine is known to act as an important regulatory molecule through its binding to specific Gprotein-associated A1, A2a, A2b, and A3 cell surface receptors. In distinction from MCM, adenosine did not suppress tumor development in mice and was not active as a chemoprotective agent when administered orally or intravenously. Thus, the in vivo activity of MCM could not be attributed to adenosine. In this study, MCM from which adenosine was enzymatically removed still retained its dual activity that was also found to be mediated through the A3 adenosine receptor (A3AR). This result led to the conclusion that natural agonists to A3AR were responsible for the activity of MCM. We further tested synthetic agonist to the A3AR and demonstrated that it possessed the same in vitro and in vivo activity profile as MCM. Taken together, muscle cells, in addition to adenosine, secrete natural agonists to A3AR. These agonists are stable nondegradable molecules and may contribute to the systemic anticancer and chemoprotective activity exerted by MCM. This group of molecules may account for the rarity of tumor metastases in muscle.http://www.sciencedirect.com/science/article/pii/S1476558601800245muscletumorA3 adenosine receptoragonists |
| spellingShingle | Sara Bar-Yehuda Faina Barer Lea Volisson Pnina Fishman Resistance of Muscle to Tumor Metastases: A Role for A3 Adenosine Receptor Agonists Neoplasia: An International Journal for Oncology Research muscle tumor A3 adenosine receptor agonists |
| title | Resistance of Muscle to Tumor Metastases: A Role for A3 Adenosine Receptor Agonists |
| title_full | Resistance of Muscle to Tumor Metastases: A Role for A3 Adenosine Receptor Agonists |
| title_fullStr | Resistance of Muscle to Tumor Metastases: A Role for A3 Adenosine Receptor Agonists |
| title_full_unstemmed | Resistance of Muscle to Tumor Metastases: A Role for A3 Adenosine Receptor Agonists |
| title_short | Resistance of Muscle to Tumor Metastases: A Role for A3 Adenosine Receptor Agonists |
| title_sort | resistance of muscle to tumor metastases a role for a3 adenosine receptor agonists |
| topic | muscle tumor A3 adenosine receptor agonists |
| url | http://www.sciencedirect.com/science/article/pii/S1476558601800245 |
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