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Giordano G, Carbone M, Ciavatta ML, Silvano E, Gavagnin M, Garson MJ, Cheney KL, Mudianta IW, Russo GF, Villani G, Magliozzi L, Polese G, Zidorn C, Cutignano A, Fontana A, Ghiselin MT, Mollo E. Volatile secondary metabolites as aposematic olfactory signals and defensive weapons in aquatic environments. Proc Natl Acad Sci U S A 2017; 114:3451-3456. [PMID: 28289233 PMCID: PMC5380024 DOI: 10.1073/pnas.1614655114] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Olfaction is considered a distance sense; hence, aquatic olfaction is thought to be mediated only by molecules dissolved in water. Here, we challenge this view by showing that shrimp and fish can recognize the presence of hydrophobic olfactory cues by a "tactile" form of chemoreception. We found that odiferous furanosesquiterpenes protect both the Mediterranean octocoral Maasella edwardsi and its specialist predator, the nudibranch gastropod Tritonia striata, from potential predators. Food treated with the terpenes elicited avoidance responses in the cooccurring shrimp Palaemon elegans Rejection was also induced in the shrimp by the memory recall of postingestive aversive effects (vomiting), evoked by repeatedly touching the food with chemosensory mouthparts. Consistent with their emetic properties once ingested, the compounds were highly toxic to brine shrimp. Further experiments on the zebrafish showed that this vertebrate aquatic model also avoids food treated with one of the terpenes, after having experienced gastrointestinal malaise. The fish refused the food after repeatedly touching it with their mouths. The compounds studied thus act simultaneously as (i) toxins, (ii) avoidance-learning inducers, and (iii) aposematic odorant cues. Although they produce a characteristic smell when exposed to air, the compounds are detected by direct contact with the emitter in aquatic environments and are perceived at high doses that are not compatible with their transport in water. The mouthparts of both the shrimp and the fish have thus been shown to act as "aquatic noses," supporting a substantial revision of the current definition of the chemical senses based upon spatial criteria.
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Affiliation(s)
- Giuseppe Giordano
- Institute of Biomolecular Chemistry, National Research Council of Italy, 80078 Pozzuoli, Italy
- Department of Science and Technology, Parthenope University of Naples, Naples 80143, Italy
| | - Marianna Carbone
- Institute of Biomolecular Chemistry, National Research Council of Italy, 80078 Pozzuoli, Italy
| | - Maria Letizia Ciavatta
- Institute of Biomolecular Chemistry, National Research Council of Italy, 80078 Pozzuoli, Italy
| | - Eleonora Silvano
- Institute of Biomolecular Chemistry, National Research Council of Italy, 80078 Pozzuoli, Italy
- Department of Biology, Federico II University of Naples, Naples 80126, Italy
| | - Margherita Gavagnin
- Institute of Biomolecular Chemistry, National Research Council of Italy, 80078 Pozzuoli, Italy
| | - Mary J Garson
- School of Chemistry and Molecular Biosciences, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Karen L Cheney
- School of Biological Sciences, The University of Queensland, Brisbane, QLD 4072, Australia
| | - I Wayan Mudianta
- Department of Analytical Chemistry, Universitas Pendidikan Ganesha, 81116 Bali, Indonesia
| | - Giovanni Fulvio Russo
- Department of Science and Technology, Parthenope University of Naples, Naples 80143, Italy
| | - Guido Villani
- Institute of Biomolecular Chemistry, National Research Council of Italy, 80078 Pozzuoli, Italy
| | - Laura Magliozzi
- Department of Biology, Federico II University of Naples, Naples 80126, Italy
| | - Gianluca Polese
- Department of Biology, Federico II University of Naples, Naples 80126, Italy
| | - Christian Zidorn
- Institute of Biomolecular Chemistry, National Research Council of Italy, 80078 Pozzuoli, Italy
- Pharmazeutisches Institut, Christian-Albrechts-Universität zu Kiel, Kiel 24118, Germany
| | - Adele Cutignano
- Institute of Biomolecular Chemistry, National Research Council of Italy, 80078 Pozzuoli, Italy
| | - Angelo Fontana
- Institute of Biomolecular Chemistry, National Research Council of Italy, 80078 Pozzuoli, Italy
| | - Michael T Ghiselin
- Department of Invertebrate Zoology, California Academy of Sciences, San Francisco, CA 94118
| | - Ernesto Mollo
- Institute of Biomolecular Chemistry, National Research Council of Italy, 80078 Pozzuoli, Italy;
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Liou BJ, Chang HS, Wang GJ, Chiang MY, Liao CH, Lin CH, Chen IS. Secondary metabolites from the leaves of Neolitsea hiiranensis and the anti-inflammatory activity of some of them. PHYTOCHEMISTRY 2011; 72:415-422. [PMID: 21295319 DOI: 10.1016/j.phytochem.2011.01.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2010] [Revised: 09/30/2010] [Accepted: 01/06/2011] [Indexed: 05/30/2023]
Abstract
Seven sesquiterpenoids, hiiranlactones A-D (1-4), (-)-ent-6α-methoxyeudesm-4(15)-en-1β-ol (5), (+)-villosine (6), hiiranepoxide (7), and one triterpenoid, hiiranterpenone (8), together with 22 known compounds, were isolated from the leaves of Neolitsea hiiranensis (Lauraceae). Their structures were elucidated by spectroscopic analysis and single crystal X-ray diffraction. Among the isolates, hiiranlactone B (2) and hiiranlactone D (4) exhibited inhibitory activity against fMLP-induced superoxide production by human neutrophils with IC(50) values of 21.86±3.97 and 25.78±4.77μM, respectively.
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Affiliation(s)
- Bi-Jiuan Liou
- Graduate Institute of Natural Products, College of Pharmacy, Kaohsiung Medical University, Kaohsiung 807, Taiwan, ROC
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