Abstract
Recent studies suggest a link between adenosine triphosphate (ATP) concentration and the amplitude of cell membrane flickering (CMF) in the human erythrocyte (red blood cell; RBC). Potentially, the origin of this phenomenon and the unique discocyte shape could be active processes that account for some of the ATP turnover in the RBC. Active flickering could depend on several factors, including pH, osmolality, enzymatic rates and metabolic fluxes. In the present work, we applied the data analysis described in the previous article to study time courses of flickering RBCs acquired using differential interference contrast light microscopy in the presence of selected effectors. We also recorded images of air bubbles in aqueous detergent solutions and oil droplets in water, both of which showed rapid fluctuations in image intensity, the former showing the same type of spectral envelope (relative frequency composition) to RBCs. We conclude that CMF is not directly an active process, but that ATP affects the elastic properties of the membrane that flickers in response to molecular bombardment in a manner that is described mathematically by a constrained random walk.
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Abbreviations
- ATP:
-
Adenosine triphosphate
- BSA:
-
Bovine serum albumin
- CMF:
-
Cell membrane flickering
- CRW:
-
Constrained random walk
- DIC:
-
Differential interference contrast
- HEPES:
-
4-(2-Hydroxyethyl)-1-piperazineethanesulfonic acid
- GAPDH:
-
Glyceraldehyde-3-phosphate dehydrogenase
- Ht :
-
Haematocrit
- HT:
-
Heat-treatment
- NEM:
-
N-Ethylmaleimide
- OA:
-
Okadaic acid
- PDAc:
-
Phorbol 12,13-diacetate
- PKC:
-
Protein kinase C
- RBC:
-
Red blood cell
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Acknowledgments
The research was supported by a Discovery Project Grant from the Australian Research Council to PWK (DP0345961) and an Australia Postgraduate Award to MP. All computer code was written in Mathematica, and a copy of these files can be obtained from either MP or PWK.
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Puckeridge, M., Chapman, B.E., Conigrave, A.D. et al. Membrane flickering of the human erythrocyte: physical and chemical effectors. Eur Biophys J 43, 169–177 (2014). https://doi.org/10.1007/s00249-014-0952-2
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DOI: https://doi.org/10.1007/s00249-014-0952-2