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Requena S, Ponomarchuk O, Castillo M, Rebik J, Brochiero E, Borejdo J, Gryczynski I, Dzyuba SV, Gryczynski Z, Grygorczyk R, Fudala R. Imaging viscosity of intragranular mucin matrix in cystic fibrosis cells. Sci Rep 2017; 7:16761. [PMID: 29196739 PMCID: PMC5711894 DOI: 10.1038/s41598-017-17037-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2017] [Accepted: 11/20/2017] [Indexed: 01/02/2023] Open
Abstract
Abnormalities of mucus viscosity play a critical role in the pathogenesis of several respiratory diseases, including cystic fibrosis. Currently, there are no approaches to assess the rheological properties of mucin granule matrices in live cells. This is the first example of the use of a molecular rotor, a BODIPY dye, to quantitatively visualize the viscosity of intragranular mucin matrices in a large population of individual granules in differentiated primary bronchial epithelial cells using fluorescence lifetime imaging microscopy.
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Affiliation(s)
- Sebastian Requena
- University of North Texas Health Science Center, Department of Microbiology, Immunology & Genetics, Fort Worth, TX, 76107, USA
| | - Olga Ponomarchuk
- Centre de Recherche du CHUM (CRCHUM), Université de Montréal, Montréal, Québec, H2×0A9, Canada
- visiting graduate student from Moscow State University, Moscow, Russia
| | - Marlius Castillo
- Texas Christian University, Department of Chemistry and Biochemistry, Fort Worth, TX, 76129, USA
| | - Jonathan Rebik
- Texas Christian University, Department of Chemistry and Biochemistry, Fort Worth, TX, 76129, USA
| | - Emmanuelle Brochiero
- Centre de Recherche du CHUM (CRCHUM), Université de Montréal, Montréal, Québec, H2×0A9, Canada
- Département de Médecine, Université de Montréal, Montréal, Québec, H3T 1J4, Canada
| | - Julian Borejdo
- University of North Texas Health Science Center, Department of Microbiology, Immunology & Genetics, Fort Worth, TX, 76107, USA
| | - Ignacy Gryczynski
- University of North Texas Health Science Center, Department of Microbiology, Immunology & Genetics, Fort Worth, TX, 76107, USA
| | - Sergei V Dzyuba
- Texas Christian University, Department of Chemistry and Biochemistry, Fort Worth, TX, 76129, USA.
| | - Zygmunt Gryczynski
- University of North Texas Health Science Center, Department of Microbiology, Immunology & Genetics, Fort Worth, TX, 76107, USA
- Texas Christian University, Department of Physics and Astronomy, Fort Worth, TX, 76129, USA
| | - Ryszard Grygorczyk
- Centre de Recherche du CHUM (CRCHUM), Université de Montréal, Montréal, Québec, H2×0A9, Canada.
- Département de Médecine, Université de Montréal, Montréal, Québec, H3T 1J4, Canada.
| | - Rafal Fudala
- University of North Texas Health Science Center, Department of Microbiology, Immunology & Genetics, Fort Worth, TX, 76107, USA.
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Guo XQ, Castellano FN, Li L, Lakowicz JR. A long-lifetime Ru(II) metal-ligand complex as a membrane probe. Biophys Chem 1998; 71:51-62. [PMID: 9591359 DOI: 10.1016/s0301-4622(97)00135-x] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
A luminescent metal-ligand complex, [Ru(bpy)2(dppz)]2+, (where dppz is dipyrido[3,2-a:2',3'-c] phenazine), was used as a photoluminescence probe for investigating submicrosecond lipid dynamics in a dipalmitoyl-L-alpha-phosphotidylglycerol (DPPG) model bilayer system. The luminescence of [Ru(bpy)2(dppz)]2+ in buffer is completely quenched but becomes luminescent when intercalated into DPPG vesicles. The experimental results show that the emission intensity of [Ru(bpy)2(dppz)]2+ intercalated into DPPG vesicles increases dramatically as temperature is increased towards the lipid phase transition temperature. This effect is abolished in bilayers containing a high concentration (> 30 mol%) of cholesterol, suggesting this probe is sensitive to the membrane composition. Frequency-domain emission intensity decays, measured as a function of increasing temperature towards the lipid phase transition temperature (2 to 57 degrees C), display two major lifetime components. The short lifetime disappears at temperatures well above the phase transition temperature. A comparison of oxygen quenching with iodide quenching suggests the heterogeneity of probe location at temperatures well below the lipid phase transition temperature and the homogeneity of probe location at temperature well above the lipid phase transition temperature. [Ru(bpy)2(dppz)]2+ displays polarized emission, enabling the study of membrane dynamics. The long decay time displayed by this probe allows measurement of the overall rotational correlation time of lipid vesicles on the microsecond time-scale. Because of the long lifetime, polarized emission, and background free nature of the photoluminescence measurements, [Ru(bpy)2(dppz)]2+ has numerous applications in the biophysical studies of membranes.
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Affiliation(s)
- X Q Guo
- Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore 21201, USA
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Guo XQ, Castellano FN, Li L, Szmacinski H, Lakowicz JR, Sipior J. A long-lived, highly luminescent Re(I) metal-ligand complex as a biomolecular probe. Anal Biochem 1997; 254:179-86. [PMID: 9417774 PMCID: PMC6915065 DOI: 10.1006/abio.1997.2413] [Citation(s) in RCA: 77] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
A highly luminescent rhenium (I) metal-ligand complex [Re(bcp)(CO)3(4-COOHPy)](ClO4), where bcp is 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline and 4-COOHPy is isonicotinic acid, has been synthesized and characterized. High quantum yields (> 0.5) and long excited-state lifetimes (0.3-10 micronseconds) in fluid solutions at room temperature were found for this complex, with remarkable emission sensitivity to microenvironment. This compound also displays highly polarized emission with a maximum anisotropy near 0.3 in the absence of rotational diffusion. This Re complex was conjugated to several biomolecules, including the proteins human serum albumin and bovine immunoglobulin G, as well as an amine-containing lipid. When bound to a protein or lipid, the decay time is near 3 microseconds and the quantum yield is approximately 0.12 in aqueous oxygenated solution at room temperature. This compound's unique spectral properties along with its conjugatability allowed us to utilize it as biomolecular probe in a variety of environments.
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Affiliation(s)
- X Q Guo
- Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore 21201, USA
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Li L, Szmacinski H, Lakowicz JR. Synthesis and luminescence spectral characterization of long-lifetime lipid metal-ligand probes. Anal Biochem 1997; 244:80-5. [PMID: 9025912 PMCID: PMC6906605 DOI: 10.1006/abio.1996.9869] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
We synthesized phospholipid analogues of phosphatidyl ethanolamine which contains a ruthenium metal-ligand complex (MLC) covalently bound to the amino group. Two analogues were synthesized, containing either one (Ru-PE) or two (Ru-PE2) lipid molecules covalently linked to the MLC by the amino group of the lipid. These MLC-lipid probes display intensity decay times from 682 to 357 ns, depending on temperature. Importantly, the luminescence MLC groups display polarized emission, enabling their use for studies of membrane dynamics. The long intensity decay times allowed measurement of the overall rotation correlation time of lipid vesicles to several microseconds. The spectral properties of the model membranes containing Ru-PE or Ru-PE2 were independent of the probe-to-lipid molar ratio from 1:20 to 1:100, suggesting minimal tendency for probe-probe interactions. These MLC-lipid probes can be expected to have numerous applications in studies of membrane dynamics on the microsecond timescale.
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Affiliation(s)
- L Li
- Department of Biochemistry & Molecular Biology, University of Maryland School of Medicine, Baltimore 21201, USA
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