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Abou El-Kassem LT, Hawas UW, El-Desouky SK, Al-Farawati R. Sesquiterpenes from the Saudi Red Sea: Litophyton arboreum with their cytotoxic and antimicrobial activities. ACTA ACUST UNITED AC 2017; 73:9-14. [DOI: 10.1515/znc-2017-0037] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2017] [Accepted: 07/24/2017] [Indexed: 11/15/2022]
Abstract
Abstract
A new pseudoguaiane-type sesquiterpene named litopharbol (1) was isolated from the methanolic extract of the Red Sea soft coral Litophyton arboreum, along with known sesquiterpenoids alismol (2), alismorientol B (3), teuhetenone A (4), and calamusin I (5); steroid, 24-methyl-cholesta-5,24(28)-diene-3β-ol (6), alkyl glyceryl ether, chimyl alcohol (7); sphingolipid, erythro-N-dodecanoyl-docosasphinga-(4E,8E)-dienine (8); and nitrogenous bases, thymine (9) and thymidine (10). The structures were determined on the basis of nuclear magnetic resonance (NMR) spectroscopic (1D and 2D NMR data including heteronuclear single quantum coherence spectroscopy, heteronuclear multiple-bond correlation spectroscopy, and nuclear Overhauser effect spectroscopy) and mass spectrometric analyses. Compounds 1–5 were explored for antimicrobial activity and cancer cell line sensitivity tests. Compound 1 exhibited antibacterial activity against Bacillus cereus with a minimum inhibition concentration of 1.8 μg/mL, whereas compound 3 showed significant potent cytotoxic effect against MCF-7 (breast cancer cells) with IC50 4.32 μM.
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Affiliation(s)
| | - Usama W. Hawas
- Marine Chemistry Department , Faculty of Marine Sciences , King Abdulaziz University , Jeddah 21589 , Kingdom of Saudi Arabia
- Phytochemistry and Plant Systematic Department , National Research Centre , Dokki 12311, Cairo , Egypt , Tel.: +966-5424-68093; Fax: +966-2640-1747
| | - Samy K. El-Desouky
- Chemistry Department , Faculty of Science , Jazan University , Jazan 2097 , Kingdom of Saudi Arabia
- Phytochemistry and Plant Systematic Department , National Research Centre , Dokki 12311, Cairo , Egypt
| | - Radwan Al-Farawati
- Marine Chemistry Department , Faculty of Marine Sciences , King Abdulaziz University , Jeddah 21589 , Kingdom of Saudi Arabia
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Fylaktakidou KC, Duarte CD, Jogireddy R, Koumbis AE, Nicolau C, Lehn JM. Polyphosphates and Pyrophosphates of Pentopyranoses and Pentofuranoses as Allosteric Effectors of Human Hemoglobin: Synthesis, Molecular Recognition, and Oxygen Release. ChemMedChem 2011; 6:1495-508. [DOI: 10.1002/cmdc.201100110] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2011] [Revised: 05/02/2011] [Indexed: 01/25/2023]
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Fylaktakidou KC, Duarte CD, Koumbis AE, Nicolau C, Lehn JM. Polyphosphates and Pyrophosphates of Hexopyranoses as Allosteric Effectors of Human Hemoglobin: Synthesis, Molecular Recognition, and Effect on Oxygen Release. ChemMedChem 2010; 6:153-68. [DOI: 10.1002/cmdc.201000366] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Lorenzetti R, Lilla S, Donato JL, de Nucci G. Simultaneous quantification of GMP, AMP, cyclic GMP and cyclic AMP by liquid chromatography coupled to tandem mass spectrometry. J Chromatogr B Analyt Technol Biomed Life Sci 2007; 859:37-41. [PMID: 17919998 DOI: 10.1016/j.jchromb.2007.09.008] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2007] [Revised: 08/24/2007] [Accepted: 09/02/2007] [Indexed: 11/24/2022]
Abstract
Phosphodiesterases are drug targets for treating various diseases. Inhibition of these can increase cAMP and cGMP levels, which can affect a variety of physiological responses. Here we report a new method for determining PDE activity by combining high-performance liquid chromatography and tandem mass spectrometry. Characteristic peaks of the substrates, cGMP or cAMP and products, GMP or AMP, were identified in positive-ion electrospray ionization using multiple reaction monitoring. The method can be applied to determine activity of PDE inhibitors. Our results showed that this new method was fast, sensitive and highly reproducible.
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Affiliation(s)
- Raquel Lorenzetti
- Departamento de Farmacologia, Faculdade de Ciências Médicas, Universidade Estadual de Campinas (UNICAMP), Campinas, SP, Brazil
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Gordillo FJL, Segovia M, López-Figueroa F. Cyclic AMP levels in several macroalgae and their relation to light quantity and quality. JOURNAL OF PLANT PHYSIOLOGY 2004; 161:211-7. [PMID: 15022836 DOI: 10.1078/0176-1617-00953] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Total cAMP levels were measured in the macroalgae Dictyota dichotoma, Gelidium sesquipedale and Ulva rigida under different light conditions in order to study its regulation either by phytochrome or photosynthesis. Incubation in red or far-red light did not promote a phytochrome-like response; instead, it showed a synergistic effect upon cAMP accumulation. cAMP levels seemed to depend on the amount of energy applied. The correlation between photosynthetic oxygen evolution and cAMP variations at sub-saturating white light irradiance pointed to photosynthetic electron transport as involved in the regulation of cAMP accumulation at least in G. sesquipedale and U. rigida. Inhibitors of thylakoidal and mitochondrial electron transport chains reduced cAMP levels in 70 to 99%. We conclude that cAMP accumulation could be regulated by photosynthetic activity rather than phytochrome in the macroalgae studied.
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Affiliation(s)
- Francisco J L Gordillo
- Departamento de Ecología, Facultad de Ciencias, Universidad de Málaga, Campus Teatinos, 29071 Málaga, Spain.
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Witters E, Quanten L, Bloemen J, Valcke R, Van Onckelen H. Product identification and adenylyl cyclase activity in chloroplasts of Nicotiana tabacum. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2004; 18:499-504. [PMID: 14966859 DOI: 10.1002/rcm.1365] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
In view of the ongoing debate on plant cyclic nucleotide metabolism, especially the functional presence of adenylyl cyclase, a novel detection method has been worked out to quantify the reaction product. Using uniformly labelled (15)N-ATP as a substrate for adenylyl cyclase, a qualitative and quantitative liquid chromatography/electrospray ionisation tandem mass spectrometry (LC/ESI-MS/MS) method was developed to measure de novo formed (15)N-adenosine 3',5'-cyclic monophosphate. Adenylyl cyclase activity was observed in chloroplasts obtained from Nicotiana tabacum cv. Petit Havana and the kinetic parameters and influence of various metabolic effectors are discussed in their context.
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Affiliation(s)
- Erwin Witters
- Laboratory for Plant Biochemistry and Plant Physiology, Department of Biology, University of Antwerp, Universiteitsplein 1, B-2610 Antwerp, Belgium.
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Segovia M, Gordillo FJ, Schaap P, Figueroa FL. Light regulation of cyclic-AMP levels in the red macroalga Porphyra leucosticta. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY. B, BIOLOGY 2001; 64:69-74. [PMID: 11705732 DOI: 10.1016/s1011-1344(01)00218-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Total cyclic-3'-5'-adenosine monophosphate (cAMP) levels were measured in the gametophyte of the red macroalga Porphyra leucosticta under different light conditions in order to study its regulation by phytochrome or photosynthesis. cAMP levels were relatively low when samples were incubated in darkness, or exposed to red or far-red light. Irradiation with red+far-red light induced a moderate increase in cAMP levels, while white light induced a pronounced increase in cAMP levels. When incubated under increasing white light irradiance, cAMP levels closely followed the increase in photosynthetic oxygen evolution rate, suggesting a direct relationship between photosynthesis and cAMP accumulation. cAMP levels were not dependent on cellular ATP concentration, as inhibitors of ATP synthesis did not significantly affect cAMP levels in light. We conclude that cAMP depends on photosynthetic activity regardless of ATP synthesis and concentration or phytochrome activity.
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Affiliation(s)
- M Segovia
- Departamento de Ecología, Facultad de Ciencias, Universidad de Málaga, Málaga, Spain.
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Newton RP, Bayliss MA, Khan JA, Bastani A, Wilkins AC, Games DE, Walton TJ, Brenton AG, Harris FM. Kinetic analysis of cyclic CMP-specific and multifunctional phosphodiesterases by quantitative positive-ion fast-atom bombardment mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 1999; 13:574-584. [PMID: 10230067 DOI: 10.1002/(sici)1097-0231(19990415)13:7<574::aid-rcm526>3.0.co;2-r] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Two enzymes, cyclic CMP-specific phosphodiesterase and multifunctional phosphodiesterase, are responsible for the hydrolysis of cytidine 3',5'-cyclic monophosphate in living cells. Quantitation of both enzymes has been carried out by positive-ion fast-atom bombardment mass spectrometric analysis of the enzyme incubates after termination of the reaction. The kinetic data obtained are in close agreement with parallel data obtained by the conventional radiometric assay. The extra facility of the mass spectrometry based assay to monitor several incubation components simultaneously has been exploited to study the concurrent hydrolysis of alternate cyclic nucleotide substrates and provides kinetic parameters of significance in interpreting substrate-enzyme interactions. This is extended by the use of collisionally-induced dissociation of the protonated molecules of the liberated products to identify the mononucleotide isomers resulting from the cyclic nucleotide hydrolysis.
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Affiliation(s)
- R P Newton
- Biochemistry Research Group, School of Biological Sciences, University of Wales Swansea, UK
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Witters E, Van Dongen W, Esmans EL, Van Onckelen HA. Ion-pair liquid chromatography-electrospray mass spectrometry for the analysis of cyclic nucleotides. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL SCIENCES AND APPLICATIONS 1997; 694:55-63. [PMID: 9234848 DOI: 10.1016/s0378-4347(96)00538-5] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
An LC-MS method has been developed combining ion-pair chromatography with an electrospray interface linking microbore and capillary HPLC to mass spectrometry. Separation of cyclic nucleotides on C18 reversed-phase columns, using tetrabutylammonium bromide as an ion pairing agent was evaluated with different mobile phase compositions. It was found that low ion-pairing agent concentration (50-500 microM) used in combination with low flow-rates (5-10 microl min(-1)) allowed the system to operate for up to several days without observing a reduced signal caused by source pollution. The loss of sensitivity expected in ion-pair chromatography could be remedied by using a 2-propanol coaxial sheath flow. Optimal conditions for negative ion electrospray resulted in a linear detection response in the femtomole to picomole range. Using biological samples this method was evaluated and compared with a classical ion-suppression RP-HPLC method using UV detection.
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Affiliation(s)
- E Witters
- Department of Biology, University of Antwerp, U.I.A., Belgium
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