Bioelectric patterning during oogenesis: stage-specific distribution of membrane potentials, intracellular pH and ion-transport mechanisms in Drosophila ovarian follicles

BMC Developmental Biology

Johannes Bohrmann¹  Julia Krüger¹ 

[1] RWTH Aachen University, Institut für Biologie II, Abt. Zoologie und Humanbiologie, Worringerweg 3, Aachen, 52056, Germany

关键词: Live-cell imaging;    Gap junction;    Ion pump;    Ion channel;    Membrane potential;    Pattern formation;    Cell communication;    Bioelectricity;    Oogenesis;    Drosophila melanogaster;   

Others  :  1089687
DOI  :  10.1186/s12861-015-0051-3

 received in 2014-09-28, accepted in 2015-01-05,  发布年份 2015

【 摘 要 】

Background

Bioelectric phenomena have been found to exert influence on various developmental and regenerative processes. Little is known about their possible functions and the cellular mechanisms by which they might act during Drosophila oogenesis. In developing follicles, characteristic extracellular current patterns and membrane-potential changes in oocyte and nurse cells have been observed that partly depend on the exchange of protons, potassium ions and sodium ions. These bioelectric properties have been supposed to be related to various processes during oogenesis, e. g. pH-regulation, osmoregulation, cell communication, cell migration, cell proliferation, cell death, vitellogenesis and follicle growth. Analysing in detail the spatial distribution and activity of the relevant ion-transport mechanisms is expected to elucidate the roles that bioelectric phenomena play during oogenesis.

Results

To obtain an overview of bioelectric patterning along the longitudinal and transversal axes of the developing follicle, the spatial distributions of membrane potentials (V_mem), intracellular pH (pH_i) and various membrane-channel proteins were studied systematically using fluorescent indicators, fluorescent inhibitors and antisera. During mid-vitellogenic stages 9 to 10B, characteristic, stage-specific V_mem-patterns in the follicle-cell epithelium as well as anteroposterior pH_i-gradients in follicle cells and nurse cells were observed. Corresponding distribution patterns of proton pumps (V-ATPases), voltage-dependent L-type Ca²⁺-channels, amiloride-sensitive Na⁺-channels and Na⁺,H⁺-exchangers (NHE) and gap-junction proteins (innexin 3) were detected. In particular, six morphologically distinguishable follicle-cell types are characterized on the bioelectric level by differences concerning V_mem and pH_i as well as specific compositions of ion channels and carriers. Striking similarities between V_mem-patterns and activity patterns of voltage-dependent Ca²⁺-channels were found, suggesting a mechanism for transducing bioelectric signals into cellular responses. Moreover, gradients of electrical potential and pH were observed within single cells.

Conclusions

Our data suggest that spatial patterning of V_mem, pH_i and specific membrane-channel proteins results in bioelectric signals that are supposed to play important roles during oogenesis, e. g. by influencing spatial coordinates, regulating migration processes or modifying the cytoskeletal organization. Characteristic stage-specific changes of bioelectric activity in specialized cell types are correlated with various developmental processes.

【 授权许可】

   
2015 Krüger and Bohrmann; licensee BioMed Central.

【 图 表 】

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