Intracellular pH (pH in) and cytosolic calcium ([Ca 2+] cyt) regulation via ATPases

Studies in cell populations, single cells and subcellular compartments

Jose Rojas, Shankar Sanka, Sandor Gyorke, Donald E. Wesson, Akwasi Minta, Raul Martinez-Zaguilan

Research output: Chapter in Book/Report/Conference proceedingChapter

3 Citations (Scopus)

Abstract

Changes in pH in and [Ca 2+] cyt are important in the signal transduction mechanisms leading to many physiological responses including cell growth, motility, secretion/exocytosis, etc. The concentrations of these ions are regulated via primary and secondary ion transporting mechanisms. In diabetes, specific pH and Ca 2+ regulatory mechanisms might be altered. To study these ions, we employ fluorescence spectroscopy (cell populations attached to coverslips), and cell imaging spectroscopy/confocal microscopy (single cells and discrete subcellular compartments). pH and Ca 2+ indicators are loaded in the cytosol with acetoxymethyl ester forms of dyes, and in endosomal/lysosomal (E/L) compartments by overnight incubation of cells with dextran-conjugated ion fluorescent probes. We focus on specific pH and Ca 2+ regulatory systems: plasmalemmal vacuolar-type H +-ATPases (pmV-ATPases) and sarcoplasmic/endoplasmic reticulum Ca 2+-ATPases (SERCA). As experimental models, we employ vascular smooth muscle (VSM) and microvascular endothelial cells. We have chosen these cells because they are important in blood flow regulation and in angiogenesis. These processes are altered in diabetes. In many cell types, ion transport processes are dependent on metabolism of glucose for maximal activity. Our main findings are: (a) glycolysis coupling the activity of SERCA is required for cytosolic Ca 2+ ([Ca 2+] cyt) homeostasis in both VSM and microvascular endothelial cells; (b) E/L compartments are important for pH and Ca 2+ regulation via H +-ATPases and SERCA, respectively; and (c) pm-V-ATPases are important for pH in regulation in microvascular endothelial cells.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
PublisherSociety of Photo-Optical Instrumentation Engineers
Pages51-63
Number of pages13
Volume3600
StatePublished - 1999
Externally publishedYes
EventProceedings of the 1999 Biomedical Imaging: Reporters, Dyes, and Instrumentation - San Jose, CA, USA
Duration: Jan 26 1999Jan 28 1999

Other

OtherProceedings of the 1999 Biomedical Imaging: Reporters, Dyes, and Instrumentation
CitySan Jose, CA, USA
Period1/26/991/28/99

Fingerprint

compartments
calcium
Calcium
Cells
endoplasmic reticulum
Endothelial cells
cells
Ions
smooth muscle
Medical problems
ions
Muscle
glycolysis
physiological responses
homeostasis
angiogenesis
Signal transduction
secretions
dextrans
Dextran

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Rojas, J., Sanka, S., Gyorke, S., Wesson, D. E., Minta, A., & Martinez-Zaguilan, R. (1999). Intracellular pH (pH in) and cytosolic calcium ([Ca 2+] cyt) regulation via ATPases: Studies in cell populations, single cells and subcellular compartments. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 3600, pp. 51-63). Society of Photo-Optical Instrumentation Engineers.

Intracellular pH (pH in) and cytosolic calcium ([Ca 2+] cyt) regulation via ATPases : Studies in cell populations, single cells and subcellular compartments. / Rojas, Jose; Sanka, Shankar; Gyorke, Sandor; Wesson, Donald E.; Minta, Akwasi; Martinez-Zaguilan, Raul.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 3600 Society of Photo-Optical Instrumentation Engineers, 1999. p. 51-63.

Research output: Chapter in Book/Report/Conference proceedingChapter

Rojas, J, Sanka, S, Gyorke, S, Wesson, DE, Minta, A & Martinez-Zaguilan, R 1999, Intracellular pH (pH in) and cytosolic calcium ([Ca 2+] cyt) regulation via ATPases: Studies in cell populations, single cells and subcellular compartments. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 3600, Society of Photo-Optical Instrumentation Engineers, pp. 51-63, Proceedings of the 1999 Biomedical Imaging: Reporters, Dyes, and Instrumentation, San Jose, CA, USA, 1/26/99.
Rojas J, Sanka S, Gyorke S, Wesson DE, Minta A, Martinez-Zaguilan R. Intracellular pH (pH in) and cytosolic calcium ([Ca 2+] cyt) regulation via ATPases: Studies in cell populations, single cells and subcellular compartments. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 3600. Society of Photo-Optical Instrumentation Engineers. 1999. p. 51-63
Rojas, Jose ; Sanka, Shankar ; Gyorke, Sandor ; Wesson, Donald E. ; Minta, Akwasi ; Martinez-Zaguilan, Raul. / Intracellular pH (pH in) and cytosolic calcium ([Ca 2+] cyt) regulation via ATPases : Studies in cell populations, single cells and subcellular compartments. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 3600 Society of Photo-Optical Instrumentation Engineers, 1999. pp. 51-63
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