Natural Products from Antarctic Colonial Ascidians of the Genera <em>Aplidium</em> and <em>Synoicum</em>: Variability and Defensive Role
Ascidians have developed multiple defensive strategies mostly related to physical, nutritional or chemical properties of the tunic. One of such is chemical defense based on secondary metabolites. We analyzed a series of colonial Antarctic ascidians from deep-water collections belonging to the genera...
Ausführliche Beschreibung
Autor*in: |
Conxita Avila [verfasserIn] Margherita Gavagnin [verfasserIn] María Mercedes Varela [verfasserIn] Jaime Rodríguez [verfasserIn] Rosa María Nieto [verfasserIn] Jennifer Vázquez [verfasserIn] Marianna Carbone [verfasserIn] Laura Núñez-Pons [verfasserIn] |
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Format: |
E-Artikel |
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Sprache: |
Englisch |
Erschienen: |
2012 |
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Schlagwörter: |
sea star <em>Odontaster</em> <em>validus</em> |
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Übergeordnetes Werk: |
In: Marine Drugs - MDPI AG, 2005, 10(2012), 8, Seite 1741-1764 |
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Übergeordnetes Werk: |
volume:10 ; year:2012 ; number:8 ; pages:1741-1764 |
Links: |
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DOI / URN: |
10.3390/md10081741 |
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Katalog-ID: |
DOAJ025962264 |
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520 | |a Ascidians have developed multiple defensive strategies mostly related to physical, nutritional or chemical properties of the tunic. One of such is chemical defense based on secondary metabolites. We analyzed a series of colonial Antarctic ascidians from deep-water collections belonging to the genera <em>Aplidium</em> and <em>Synoicum</em> to evaluate the incidence of organic deterrents and their variability. The ether fractions from 15 samples including specimens of the species <em>A.</em> <em>falklandicum</em>, <em>A.</em> <em>fuegiense</em>, <em>A.</em> <em>meridianum</em>, <em>A.</em> <em>millari</em> and <em>S.</em> <em>adareanum</em> were subjected to feeding assays towards two relevant sympatric predators: the starfish <em>Odontaster</em> <em>validus</em>, and the amphipod <em>Cheirimedon</em> <em>femoratus</em>. All samples revealed repellency. Nonetheless, some colonies concentrated defensive chemicals in internal body-regions rather than in the tunic. Four ascidian-derived meroterpenoids, rossinones B and the three derivatives 2,3-epoxy-rossinone B, 3-epi-rossinone B, 5,6-epoxy-rossinone B, and the indole alkaloids meridianins A–G, along with other minoritary meridianin compounds were isolated from several samples. Some purified metabolites were tested in feeding assays exhibiting potent unpalatabilities, thus revealing their role in predation avoidance. Ascidian extracts and purified compound-fractions were further assessed in antibacterial tests against a marine Antarctic bacterium. Only the meridianins showed inhibition activity, demonstrating a multifunctional defensive role. According to their occurrence in nature and within our colonial specimens, the possible origin of both types of metabolites is discussed. | ||
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10.3390/md10081741 doi (DE-627)DOAJ025962264 (DE-599)DOAJ6d36f4183cfd4a249a371131ebe29cd0 DE-627 ger DE-627 rakwb eng QH301-705.5 Conxita Avila verfasserin aut Natural Products from Antarctic Colonial Ascidians of the Genera <em>Aplidium</em> and <em>Synoicum</em>: Variability and Defensive Role 2012 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Ascidians have developed multiple defensive strategies mostly related to physical, nutritional or chemical properties of the tunic. One of such is chemical defense based on secondary metabolites. We analyzed a series of colonial Antarctic ascidians from deep-water collections belonging to the genera <em>Aplidium</em> and <em>Synoicum</em> to evaluate the incidence of organic deterrents and their variability. The ether fractions from 15 samples including specimens of the species <em>A.</em> <em>falklandicum</em>, <em>A.</em> <em>fuegiense</em>, <em>A.</em> <em>meridianum</em>, <em>A.</em> <em>millari</em> and <em>S.</em> <em>adareanum</em> were subjected to feeding assays towards two relevant sympatric predators: the starfish <em>Odontaster</em> <em>validus</em>, and the amphipod <em>Cheirimedon</em> <em>femoratus</em>. All samples revealed repellency. Nonetheless, some colonies concentrated defensive chemicals in internal body-regions rather than in the tunic. Four ascidian-derived meroterpenoids, rossinones B and the three derivatives 2,3-epoxy-rossinone B, 3-epi-rossinone B, 5,6-epoxy-rossinone B, and the indole alkaloids meridianins A–G, along with other minoritary meridianin compounds were isolated from several samples. Some purified metabolites were tested in feeding assays exhibiting potent unpalatabilities, thus revealing their role in predation avoidance. Ascidian extracts and purified compound-fractions were further assessed in antibacterial tests against a marine Antarctic bacterium. Only the meridianins showed inhibition activity, demonstrating a multifunctional defensive role. According to their occurrence in nature and within our colonial specimens, the possible origin of both types of metabolites is discussed. Antarctic colonial tunicates deterrent activity sea star <em>Odontaster</em> <em>validus</em> amphipod <em>Cheirimedon</em> <em>femoratus</em> antibacterial activity Biology (General) Margherita Gavagnin verfasserin aut María Mercedes Varela verfasserin aut Jaime Rodríguez verfasserin aut Rosa María Nieto verfasserin aut Jennifer Vázquez verfasserin aut Marianna Carbone verfasserin aut Laura Núñez-Pons verfasserin aut In Marine Drugs MDPI AG, 2005 10(2012), 8, Seite 1741-1764 (DE-627)477992420 (DE-600)2175190-0 16603397 nnns volume:10 year:2012 number:8 pages:1741-1764 https://doi.org/10.3390/md10081741 kostenfrei https://doaj.org/article/6d36f4183cfd4a249a371131ebe29cd0 kostenfrei http://www.mdpi.com/1660-3397/10/8/1741 kostenfrei https://doaj.org/toc/1660-3397 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_381 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 10 2012 8 1741-1764 |
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10.3390/md10081741 doi (DE-627)DOAJ025962264 (DE-599)DOAJ6d36f4183cfd4a249a371131ebe29cd0 DE-627 ger DE-627 rakwb eng QH301-705.5 Conxita Avila verfasserin aut Natural Products from Antarctic Colonial Ascidians of the Genera <em>Aplidium</em> and <em>Synoicum</em>: Variability and Defensive Role 2012 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Ascidians have developed multiple defensive strategies mostly related to physical, nutritional or chemical properties of the tunic. One of such is chemical defense based on secondary metabolites. We analyzed a series of colonial Antarctic ascidians from deep-water collections belonging to the genera <em>Aplidium</em> and <em>Synoicum</em> to evaluate the incidence of organic deterrents and their variability. The ether fractions from 15 samples including specimens of the species <em>A.</em> <em>falklandicum</em>, <em>A.</em> <em>fuegiense</em>, <em>A.</em> <em>meridianum</em>, <em>A.</em> <em>millari</em> and <em>S.</em> <em>adareanum</em> were subjected to feeding assays towards two relevant sympatric predators: the starfish <em>Odontaster</em> <em>validus</em>, and the amphipod <em>Cheirimedon</em> <em>femoratus</em>. All samples revealed repellency. Nonetheless, some colonies concentrated defensive chemicals in internal body-regions rather than in the tunic. Four ascidian-derived meroterpenoids, rossinones B and the three derivatives 2,3-epoxy-rossinone B, 3-epi-rossinone B, 5,6-epoxy-rossinone B, and the indole alkaloids meridianins A–G, along with other minoritary meridianin compounds were isolated from several samples. Some purified metabolites were tested in feeding assays exhibiting potent unpalatabilities, thus revealing their role in predation avoidance. Ascidian extracts and purified compound-fractions were further assessed in antibacterial tests against a marine Antarctic bacterium. Only the meridianins showed inhibition activity, demonstrating a multifunctional defensive role. According to their occurrence in nature and within our colonial specimens, the possible origin of both types of metabolites is discussed. Antarctic colonial tunicates deterrent activity sea star <em>Odontaster</em> <em>validus</em> amphipod <em>Cheirimedon</em> <em>femoratus</em> antibacterial activity Biology (General) Margherita Gavagnin verfasserin aut María Mercedes Varela verfasserin aut Jaime Rodríguez verfasserin aut Rosa María Nieto verfasserin aut Jennifer Vázquez verfasserin aut Marianna Carbone verfasserin aut Laura Núñez-Pons verfasserin aut In Marine Drugs MDPI AG, 2005 10(2012), 8, Seite 1741-1764 (DE-627)477992420 (DE-600)2175190-0 16603397 nnns volume:10 year:2012 number:8 pages:1741-1764 https://doi.org/10.3390/md10081741 kostenfrei https://doaj.org/article/6d36f4183cfd4a249a371131ebe29cd0 kostenfrei http://www.mdpi.com/1660-3397/10/8/1741 kostenfrei https://doaj.org/toc/1660-3397 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_381 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 10 2012 8 1741-1764 |
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10.3390/md10081741 doi (DE-627)DOAJ025962264 (DE-599)DOAJ6d36f4183cfd4a249a371131ebe29cd0 DE-627 ger DE-627 rakwb eng QH301-705.5 Conxita Avila verfasserin aut Natural Products from Antarctic Colonial Ascidians of the Genera <em>Aplidium</em> and <em>Synoicum</em>: Variability and Defensive Role 2012 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Ascidians have developed multiple defensive strategies mostly related to physical, nutritional or chemical properties of the tunic. One of such is chemical defense based on secondary metabolites. We analyzed a series of colonial Antarctic ascidians from deep-water collections belonging to the genera <em>Aplidium</em> and <em>Synoicum</em> to evaluate the incidence of organic deterrents and their variability. The ether fractions from 15 samples including specimens of the species <em>A.</em> <em>falklandicum</em>, <em>A.</em> <em>fuegiense</em>, <em>A.</em> <em>meridianum</em>, <em>A.</em> <em>millari</em> and <em>S.</em> <em>adareanum</em> were subjected to feeding assays towards two relevant sympatric predators: the starfish <em>Odontaster</em> <em>validus</em>, and the amphipod <em>Cheirimedon</em> <em>femoratus</em>. All samples revealed repellency. Nonetheless, some colonies concentrated defensive chemicals in internal body-regions rather than in the tunic. Four ascidian-derived meroterpenoids, rossinones B and the three derivatives 2,3-epoxy-rossinone B, 3-epi-rossinone B, 5,6-epoxy-rossinone B, and the indole alkaloids meridianins A–G, along with other minoritary meridianin compounds were isolated from several samples. Some purified metabolites were tested in feeding assays exhibiting potent unpalatabilities, thus revealing their role in predation avoidance. Ascidian extracts and purified compound-fractions were further assessed in antibacterial tests against a marine Antarctic bacterium. Only the meridianins showed inhibition activity, demonstrating a multifunctional defensive role. According to their occurrence in nature and within our colonial specimens, the possible origin of both types of metabolites is discussed. Antarctic colonial tunicates deterrent activity sea star <em>Odontaster</em> <em>validus</em> amphipod <em>Cheirimedon</em> <em>femoratus</em> antibacterial activity Biology (General) Margherita Gavagnin verfasserin aut María Mercedes Varela verfasserin aut Jaime Rodríguez verfasserin aut Rosa María Nieto verfasserin aut Jennifer Vázquez verfasserin aut Marianna Carbone verfasserin aut Laura Núñez-Pons verfasserin aut In Marine Drugs MDPI AG, 2005 10(2012), 8, Seite 1741-1764 (DE-627)477992420 (DE-600)2175190-0 16603397 nnns volume:10 year:2012 number:8 pages:1741-1764 https://doi.org/10.3390/md10081741 kostenfrei https://doaj.org/article/6d36f4183cfd4a249a371131ebe29cd0 kostenfrei http://www.mdpi.com/1660-3397/10/8/1741 kostenfrei https://doaj.org/toc/1660-3397 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_381 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 10 2012 8 1741-1764 |
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10.3390/md10081741 doi (DE-627)DOAJ025962264 (DE-599)DOAJ6d36f4183cfd4a249a371131ebe29cd0 DE-627 ger DE-627 rakwb eng QH301-705.5 Conxita Avila verfasserin aut Natural Products from Antarctic Colonial Ascidians of the Genera <em>Aplidium</em> and <em>Synoicum</em>: Variability and Defensive Role 2012 Text txt rdacontent Computermedien c rdamedia Online-Ressource cr rdacarrier Ascidians have developed multiple defensive strategies mostly related to physical, nutritional or chemical properties of the tunic. One of such is chemical defense based on secondary metabolites. We analyzed a series of colonial Antarctic ascidians from deep-water collections belonging to the genera <em>Aplidium</em> and <em>Synoicum</em> to evaluate the incidence of organic deterrents and their variability. The ether fractions from 15 samples including specimens of the species <em>A.</em> <em>falklandicum</em>, <em>A.</em> <em>fuegiense</em>, <em>A.</em> <em>meridianum</em>, <em>A.</em> <em>millari</em> and <em>S.</em> <em>adareanum</em> were subjected to feeding assays towards two relevant sympatric predators: the starfish <em>Odontaster</em> <em>validus</em>, and the amphipod <em>Cheirimedon</em> <em>femoratus</em>. All samples revealed repellency. Nonetheless, some colonies concentrated defensive chemicals in internal body-regions rather than in the tunic. Four ascidian-derived meroterpenoids, rossinones B and the three derivatives 2,3-epoxy-rossinone B, 3-epi-rossinone B, 5,6-epoxy-rossinone B, and the indole alkaloids meridianins A–G, along with other minoritary meridianin compounds were isolated from several samples. Some purified metabolites were tested in feeding assays exhibiting potent unpalatabilities, thus revealing their role in predation avoidance. Ascidian extracts and purified compound-fractions were further assessed in antibacterial tests against a marine Antarctic bacterium. Only the meridianins showed inhibition activity, demonstrating a multifunctional defensive role. According to their occurrence in nature and within our colonial specimens, the possible origin of both types of metabolites is discussed. Antarctic colonial tunicates deterrent activity sea star <em>Odontaster</em> <em>validus</em> amphipod <em>Cheirimedon</em> <em>femoratus</em> antibacterial activity Biology (General) Margherita Gavagnin verfasserin aut María Mercedes Varela verfasserin aut Jaime Rodríguez verfasserin aut Rosa María Nieto verfasserin aut Jennifer Vázquez verfasserin aut Marianna Carbone verfasserin aut Laura Núñez-Pons verfasserin aut In Marine Drugs MDPI AG, 2005 10(2012), 8, Seite 1741-1764 (DE-627)477992420 (DE-600)2175190-0 16603397 nnns volume:10 year:2012 number:8 pages:1741-1764 https://doi.org/10.3390/md10081741 kostenfrei https://doaj.org/article/6d36f4183cfd4a249a371131ebe29cd0 kostenfrei http://www.mdpi.com/1660-3397/10/8/1741 kostenfrei https://doaj.org/toc/1660-3397 Journal toc kostenfrei GBV_USEFLAG_A SYSFLAG_A GBV_DOAJ SSG-OLC-PHA GBV_ILN_20 GBV_ILN_22 GBV_ILN_23 GBV_ILN_24 GBV_ILN_39 GBV_ILN_40 GBV_ILN_60 GBV_ILN_62 GBV_ILN_63 GBV_ILN_65 GBV_ILN_69 GBV_ILN_70 GBV_ILN_73 GBV_ILN_74 GBV_ILN_95 GBV_ILN_105 GBV_ILN_110 GBV_ILN_151 GBV_ILN_161 GBV_ILN_170 GBV_ILN_206 GBV_ILN_213 GBV_ILN_230 GBV_ILN_285 GBV_ILN_293 GBV_ILN_381 GBV_ILN_602 GBV_ILN_2014 GBV_ILN_2147 GBV_ILN_2148 GBV_ILN_4012 GBV_ILN_4037 GBV_ILN_4112 GBV_ILN_4125 GBV_ILN_4126 GBV_ILN_4249 GBV_ILN_4305 GBV_ILN_4306 GBV_ILN_4307 GBV_ILN_4313 GBV_ILN_4322 GBV_ILN_4323 GBV_ILN_4324 GBV_ILN_4325 GBV_ILN_4338 GBV_ILN_4367 GBV_ILN_4700 AR 10 2012 8 1741-1764 |
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Conxita Avila @@aut@@ Margherita Gavagnin @@aut@@ María Mercedes Varela @@aut@@ Jaime Rodríguez @@aut@@ Rosa María Nieto @@aut@@ Jennifer Vázquez @@aut@@ Marianna Carbone @@aut@@ Laura Núñez-Pons @@aut@@ |
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QH301-705.5 Natural Products from Antarctic Colonial Ascidians of the Genera <em>Aplidium</em> and <em>Synoicum</em>: Variability and Defensive Role Antarctic colonial tunicates deterrent activity sea star <em>Odontaster</em> <em>validus</em> amphipod <em>Cheirimedon</em> <em>femoratus</em> antibacterial activity |
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Natural Products from Antarctic Colonial Ascidians of the Genera <em>Aplidium</em> and <em>Synoicum</em>: Variability and Defensive Role |
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Conxita Avila |
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Conxita Avila Margherita Gavagnin María Mercedes Varela Jaime Rodríguez Rosa María Nieto Jennifer Vázquez Marianna Carbone Laura Núñez-Pons |
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natural products from antarctic colonial ascidians of the genera <em>aplidium</em> and <em>synoicum</em>: variability and defensive role |
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QH301-705.5 |
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Natural Products from Antarctic Colonial Ascidians of the Genera <em>Aplidium</em> and <em>Synoicum</em>: Variability and Defensive Role |
abstract |
Ascidians have developed multiple defensive strategies mostly related to physical, nutritional or chemical properties of the tunic. One of such is chemical defense based on secondary metabolites. We analyzed a series of colonial Antarctic ascidians from deep-water collections belonging to the genera <em>Aplidium</em> and <em>Synoicum</em> to evaluate the incidence of organic deterrents and their variability. The ether fractions from 15 samples including specimens of the species <em>A.</em> <em>falklandicum</em>, <em>A.</em> <em>fuegiense</em>, <em>A.</em> <em>meridianum</em>, <em>A.</em> <em>millari</em> and <em>S.</em> <em>adareanum</em> were subjected to feeding assays towards two relevant sympatric predators: the starfish <em>Odontaster</em> <em>validus</em>, and the amphipod <em>Cheirimedon</em> <em>femoratus</em>. All samples revealed repellency. Nonetheless, some colonies concentrated defensive chemicals in internal body-regions rather than in the tunic. Four ascidian-derived meroterpenoids, rossinones B and the three derivatives 2,3-epoxy-rossinone B, 3-epi-rossinone B, 5,6-epoxy-rossinone B, and the indole alkaloids meridianins A–G, along with other minoritary meridianin compounds were isolated from several samples. Some purified metabolites were tested in feeding assays exhibiting potent unpalatabilities, thus revealing their role in predation avoidance. Ascidian extracts and purified compound-fractions were further assessed in antibacterial tests against a marine Antarctic bacterium. Only the meridianins showed inhibition activity, demonstrating a multifunctional defensive role. According to their occurrence in nature and within our colonial specimens, the possible origin of both types of metabolites is discussed. |
abstractGer |
Ascidians have developed multiple defensive strategies mostly related to physical, nutritional or chemical properties of the tunic. One of such is chemical defense based on secondary metabolites. We analyzed a series of colonial Antarctic ascidians from deep-water collections belonging to the genera <em>Aplidium</em> and <em>Synoicum</em> to evaluate the incidence of organic deterrents and their variability. The ether fractions from 15 samples including specimens of the species <em>A.</em> <em>falklandicum</em>, <em>A.</em> <em>fuegiense</em>, <em>A.</em> <em>meridianum</em>, <em>A.</em> <em>millari</em> and <em>S.</em> <em>adareanum</em> were subjected to feeding assays towards two relevant sympatric predators: the starfish <em>Odontaster</em> <em>validus</em>, and the amphipod <em>Cheirimedon</em> <em>femoratus</em>. All samples revealed repellency. Nonetheless, some colonies concentrated defensive chemicals in internal body-regions rather than in the tunic. Four ascidian-derived meroterpenoids, rossinones B and the three derivatives 2,3-epoxy-rossinone B, 3-epi-rossinone B, 5,6-epoxy-rossinone B, and the indole alkaloids meridianins A–G, along with other minoritary meridianin compounds were isolated from several samples. Some purified metabolites were tested in feeding assays exhibiting potent unpalatabilities, thus revealing their role in predation avoidance. Ascidian extracts and purified compound-fractions were further assessed in antibacterial tests against a marine Antarctic bacterium. Only the meridianins showed inhibition activity, demonstrating a multifunctional defensive role. According to their occurrence in nature and within our colonial specimens, the possible origin of both types of metabolites is discussed. |
abstract_unstemmed |
Ascidians have developed multiple defensive strategies mostly related to physical, nutritional or chemical properties of the tunic. One of such is chemical defense based on secondary metabolites. We analyzed a series of colonial Antarctic ascidians from deep-water collections belonging to the genera <em>Aplidium</em> and <em>Synoicum</em> to evaluate the incidence of organic deterrents and their variability. The ether fractions from 15 samples including specimens of the species <em>A.</em> <em>falklandicum</em>, <em>A.</em> <em>fuegiense</em>, <em>A.</em> <em>meridianum</em>, <em>A.</em> <em>millari</em> and <em>S.</em> <em>adareanum</em> were subjected to feeding assays towards two relevant sympatric predators: the starfish <em>Odontaster</em> <em>validus</em>, and the amphipod <em>Cheirimedon</em> <em>femoratus</em>. All samples revealed repellency. Nonetheless, some colonies concentrated defensive chemicals in internal body-regions rather than in the tunic. Four ascidian-derived meroterpenoids, rossinones B and the three derivatives 2,3-epoxy-rossinone B, 3-epi-rossinone B, 5,6-epoxy-rossinone B, and the indole alkaloids meridianins A–G, along with other minoritary meridianin compounds were isolated from several samples. Some purified metabolites were tested in feeding assays exhibiting potent unpalatabilities, thus revealing their role in predation avoidance. Ascidian extracts and purified compound-fractions were further assessed in antibacterial tests against a marine Antarctic bacterium. Only the meridianins showed inhibition activity, demonstrating a multifunctional defensive role. According to their occurrence in nature and within our colonial specimens, the possible origin of both types of metabolites is discussed. |
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title_short |
Natural Products from Antarctic Colonial Ascidians of the Genera <em>Aplidium</em> and <em>Synoicum</em>: Variability and Defensive Role |
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https://doi.org/10.3390/md10081741 https://doaj.org/article/6d36f4183cfd4a249a371131ebe29cd0 http://www.mdpi.com/1660-3397/10/8/1741 https://doaj.org/toc/1660-3397 |
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Margherita Gavagnin María Mercedes Varela Jaime Rodríguez Rosa María Nieto Jennifer Vázquez Marianna Carbone Laura Núñez-Pons |
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