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Nora Naumann, Olga Siratska, Manfred Gahr, Angela Rösen-Wolff 

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Presentation on theme: "Nora Naumann, Olga Siratska, Manfred Gahr, Angela Rösen-Wolff "— Presentation transcript:

1 P-glycoprotein expression increases ATP release in respiratory cystic fibrosis cells 
Nora Naumann, Olga Siratska, Manfred Gahr, Angela Rösen-Wolff  Journal of Cystic Fibrosis  Volume 4, Issue 3, Pages (September 2005) DOI: /j.jcf Copyright © 2005 European Cystic Fibrosis Society Terms and Conditions

2 Fig. 1 Example of one quantitative RT-PCR run for the analysis of MDR1-mRNA levels is presented here in a comparative manner for ∑CFTE29ó cells transduced with MP1m (grey) and native ∑CFTE29ó cells (black). Each sample was investigated three times. Transduction of ∑CFTE29ó cells with the MP1m vector coding for Pgp led to an increase of MDR1 gene transcription reflected by an earlier rise of the ΔRn value (normalized fluorescence signal). No difference of the simultaneously measured active reference (GAPDH-mRNA) was observed (data not shown). Journal of Cystic Fibrosis 2005 4, DOI: ( /j.jcf ) Copyright © 2005 European Cystic Fibrosis Society Terms and Conditions

3 Fig. 2 Pgp expression in ∑CFTE29ó cells transduced with MP1m vector was verified flowcytometrically using the specific primary Pgp-antibody UIC2 IgG2a and a FITC-labelled secondary antibody. A comparison between the analysis for native (A) and ∑CFTE29ó cells transduced with MP1m (B) is shown. Transduced cells express Pgp represented by a higher fluorescence level if cells were stained with the Pgp-antibody and secondary antibody GAM Ig FITC. No difference in the fluorescence signals between native and transduced cells was seen for the negative controls. Solid line: specific mouse-anti-human Pgp-antibody (UIC2 IgG2a) and FITC-conjugated goat-anti-mouse IgG-antibody (GAM Ig FITC). Broken line: GAM Ig FITC. Dotted line: isotype-matched control antibody (mouse-anti-human IgG2a). Journal of Cystic Fibrosis 2005 4, DOI: ( /j.jcf ) Copyright © 2005 European Cystic Fibrosis Society Terms and Conditions

4 Fig. 3 Since rhodamine 123 is transported by Pgp this fluorescent dye can be used to analyze Pgp transport function. ∑CFTE29ó cells transduced with MP1m expressed functionable Pgp (∑CFTE29óPgp) proved flowcytometrically via a rhodamine 123 accumulation and efflux assay. ∑CFTE29óPgp showed a lower accumulation and a higher efflux of rhodamine 123 in comparison to native cells (A). Addition of the Pgp inhibitor cyclosporine A (CsA) led to a high rhodamine 123 accumulation and blocked efflux of the dye in ∑CFTE29óPgp cells reflected by no difference between transduced and native cells (B). Blue solid line: native ∑CFTE29ó after accumulation period; dashed blue line: ∑CFTE29ó after efflux period; red solid line: ∑CFTE29óPgp after accumulation period; dashed red line: ∑CFTE29óPgp after efflux period. Journal of Cystic Fibrosis 2005 4, DOI: ( /j.jcf ) Copyright © 2005 European Cystic Fibrosis Society Terms and Conditions

5 Fig. 4 ∑CFTE29ó cells were long-term exposed to rising concentrations of colchicine (treatment steps are shown as grey background in the diagram). Fourteen different samples of ∑CFTE29ó cells stimulated with colchicine were investigated by quantitative RT-PCR to analyze MDR1 transcription. Relative levels of MDR1 mRNA are represented by the solid black curve as a function of treatment time and concentration of colchicine. After 231 days of exposure (up to 17 ng/ml) a sharp rise in the MDR1 transcription up to an approximately 100-fold amount compared to untreated cells could be observed. *Significant increase of MDR1 mRNA in samples 10–14 in comparison to the previous samples 1–9 (p<0.025, n=3). Journal of Cystic Fibrosis 2005 4, DOI: ( /j.jcf ) Copyright © 2005 European Cystic Fibrosis Society Terms and Conditions

6 Fig. 5 Pgp expression in ∑CFTE29ó cells treated with increasing concentrations of colchicine was investigated flowcytometrically by indirect immunfluorescence using the specific Pgp-antibody UIC2 IgG2a and a secondary antibody labelled with FITC. A comparison between an analysis for native ∑CFTE29ó cells (A) and ∑CFTE29ó cells after treatment with rising colchicine concentrations for 231 days up to 17 ng/ml (B) is presented. Treated cells express Pgp shown by a higher fluorescence level if cells were stained with both the primary and secondary antibodies. Solid line: specific mouse-anti-human Pgp-antibody (UIC2 IgG2a) and FITC-conjugated goat-anti-mouse IgG-antibody (GAM Ig FITC); blocked line: only GAM Ig FITC; dotted line: isotype-matched control antibody (mouse-anti-human IgG2a). Journal of Cystic Fibrosis 2005 4, DOI: ( /j.jcf ) Copyright © 2005 European Cystic Fibrosis Society Terms and Conditions

7 Fig. 6 ATP release in native ∑CFTE29ó and cells overexpressing Pgp (∑CFTE29óPgp) was measured by bioluminescence assay (luciferin-luciferase assay) under isotonic (A) and hypotonic (B) conditions. A comparison between the results for native (left) and ∑CFTE29óPgp cells (right) is presented. A higher extracellular ATP concentration was found in the Pgp-expressing cells under isotonic as well as under hypotonic conditions. *Significant increase of extracellular ATP concentration (p<0.001, n=36–72). Journal of Cystic Fibrosis 2005 4, DOI: ( /j.jcf ) Copyright © 2005 European Cystic Fibrosis Society Terms and Conditions

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