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Brière C, Barthou H, Petitprez M. A new tool for plant cell biology: in vivo antibody uptake in plant protoplasts. Plant Cell Rep 2004; 22:878-84. [PMID: 15042411 DOI: 10.1007/s00299-004-0788-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2003] [Revised: 02/16/2004] [Accepted: 02/16/2004] [Indexed: 05/24/2023]
Abstract
We report on the in vivo uptake of antibodies into plant protoplasts. When protoplasts of sunflower, Arabidopsis or tobacco were incubated in vivo with an antibody, this antibody was detected by immunofluorescence in the cytoplasm and/or the nucleus, depending on the location of the target protein. Furthermore, when protoplasts were cultured in the presence of antibodies, specific effects were observed. Incubation with antibodies raised against p34cdc2 led to a strong inhibition of the division rate, and a decrease in the average DNA content of protoplasts. With antibodies against HaWLIM1, a LIM domain protein of the CRP type, a negative effect on actin organisation was observed. We conclude that antibodies can penetrate plant protoplasts in vivo, and thus may be used as powerful tools for the study of protein function.
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Affiliation(s)
- C Brière
- UMR CNRS/UPS 5546, BP 17 Auzeville, 31326, Castanet-Tolosan, France.
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Abstract
The cytological location of ion channel antagonist-binding sites was studied in sunflower protoplasts using the fluorescent probes DM-Bodipy-PAA and DM-Bodipy-DHP. The binding specificity of the probes was established by competition experiments with Bepridil, phenylalkylamine (Verapamil) and dihydropyridine (Nifedipine) which are known as calcium and potassium channel antagonists. Quantitative image analysis of the fluorescence emitted by the protoplasts showed the existence of interactions between PAA- and DHP-binding sites. Moreover, studies on the cytolocalization of the PAA receptors by confocal imaging showed that in freshly isolated protoplasts, DM-Bodipy-PAA binds exclusively at sites located in the cortical region of the cell.
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Affiliation(s)
- N Vallée
- Laboratoire de Biotechnologie et Amélioration des Plantes (BAP), INP-ENSAT/UA INRA, Toulouse, France
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Barthou H, Brière C, Caumont C, Petitprez M, Kallerhoff J, Borin C, Souvré A, Alibert G. Effect of atmospheric pressure on sunflower (Helianthus annuus L.) protoplast division. Plant Cell Rep 1997; 16:310-314. [PMID: 30727669 DOI: 10.1007/bf01088287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/1996] [Revised: 06/05/1996] [Indexed: 06/09/2023]
Abstract
Sunflower protoplasts were cultured in liquid medium under high atmospheric pressure (0.2 to 0.6 MPa) and the plating efficiency, cell wall synthesis and microtubule organization were assessed. In 7-day-old cultures under a pressure of 0.4 MPa and above, the division rate was strongly reduced by more than 60% as compared to the control. Although most of the protoplasts had begun to regenerate a new cell wall they were unable to complete this process. Pressure also had an inhibitory effect on microtubule synthesis. The percentage of protoplasts showing a disassembled cortical network of microtubules was significantly increased up to 60% of the population. These effects were reversible: when protoplasts were transferred to normal pressure most of them rapidly recovered their capacity to divide and afterwards developed normally. Culturing protoplasts under a pressurized atmosphere revealed to be a good model system for studying cortical microtubule dynamics.
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Affiliation(s)
- H Barthou
- Laboratoire de Biotechnologie et Amelioration des Plantes, Unite Associée INPT/INRA, ENSAT, 145 Av. de Muret, F-31076, Toulouse, Cedex, France
| | - C Brière
- Laboratoire de Biotechnologie et Amelioration des Plantes, Unite Associée INPT/INRA, ENSAT, 145 Av. de Muret, F-31076, Toulouse, Cedex, France
| | - C Caumont
- Laboratoire de Biotechnologie et Amelioration des Plantes, Unite Associée INPT/INRA, ENSAT, 145 Av. de Muret, F-31076, Toulouse, Cedex, France
| | - M Petitprez
- Laboratoire de Biotechnologie et Amelioration des Plantes, Unite Associée INPT/INRA, ENSAT, 145 Av. de Muret, F-31076, Toulouse, Cedex, France
| | - J Kallerhoff
- Laboratoire de Biotechnologie et Amelioration des Plantes, Unite Associée INPT/INRA, ENSAT, 145 Av. de Muret, F-31076, Toulouse, Cedex, France
| | - C Borin
- Laboratoire de Biotechnologie et Amelioration des Plantes, Unite Associée INPT/INRA, ENSAT, 145 Av. de Muret, F-31076, Toulouse, Cedex, France
- Ecole Nationale de Formation Agronomique, BP 87, F-31326, Castanet-Tolosan Cedex, France
| | - A Souvré
- Laboratoire de Biotechnologie et Amelioration des Plantes, Unite Associée INPT/INRA, ENSAT, 145 Av. de Muret, F-31076, Toulouse, Cedex, France
| | - G Alibert
- Laboratoire de Biotechnologie et Amelioration des Plantes, Unite Associée INPT/INRA, ENSAT, 145 Av. de Muret, F-31076, Toulouse, Cedex, France
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Abstract
The main stem development and the photosynthetic activity of leaves 2 to 9 were studied in soja (Glycine max (L.) Merr.) at the leaf blade extension and adult stages. A correlation between the different leaf growth parameters (rates, durations) and the phyllochrone has been demonstrated. That correlation varied with the age and rank of the leaf. Moreover, the existence of correlations between net photosynthesis on one hand and the rate of development and the leaf growth kinetics on the other hand reveals an interdependence between photosynthesis and morphogenesis. [Journal translation]
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