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    Our Research:
  • Calcium Signalling
  • Channels and Fertility

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  • VIDEO OVERVIEW

    Ca2+ Waves
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    Sperm Patch Clamp
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    Calcium waves in Xenopus laevis oocytes

    Format: Quicktime Movie
    Download - 45 MB
    Intracellular calcium levels were imaged in stage V oocytes by confocal microscopy. Fluo-3 or Calcium green fluorescent indicators undergo a shift in wavelength upon binding free calcium ions. Calcium levels at rest are ~50-100 nM (black or gray) and rise to ~500 nM at peak values (shown as green or white). Experimental manipulations with oocytes expressing muscarinic type 2 (M2) or muscarinic type 3 (M3) are indicated. Caged IP3 or GTPgammaS was uncaged by UV (360 nm) excitation. See the references cited below for details. The experiments shown here were from the Science 1991, Nature 1991, Science 1993 papers.

  • Lechleiter JL, Girard S, Peralta EG, and Clapham DE. Spiral calcium wave propagation and annihilation in Xenopus oocytes. Science, 1991; 252:123-126.
  • Lechleiter JL, Girard S, Clapham DE, and Peralta EG. G protein specific residues of muscarinic receptors determine subcellular patterns of calcium release. Nature, 1991; 350:505-508.
  • Lechleiter J and Clapham DE. Molecular mechanisms of intracellular calcium release in Xenopus laevis oocytes. Cell, 1992; 69:1-20.
  • Bliton C, Lechleiter J, and Clapham DE. Simultaneous ultraviolet and visible excitation confocal microscopy. Journal of Microscopy, 1993; 169:15-26.
  • Girard S and Clapham DE. Acceleration of intracellular calcium waves in Xenopus oocytes by calcium influx. Science, 1993; 260:229-232.
  • Atri A, Amundson J, Clapham DE, and Sneyd J. A single pool model for intracellular calcium oscillations and waves in the Xenopus oocyte. Biophysical Journal, 1993; 65:1727-1739.
  • Girard S and Clapham DE. Simultaneous near ultraviolet and visible excitation microscopy of calcium transients in Xenopus oocytes. In: Methods in Cell Biology: A practical guide to the study of Ca2+ in living cells, [R. Nuccitelli, ed], Academic Press, 1994; 40:263-284.
  • Bliton C, Lechleiter J, and Clapham DE. Simultaneous ultraviolet and visible wavelength confocal microscopy. In: Confocal Microscopy, [Stevens J, Mills L, and Trogadis J, eds], Academic Press, 1994; 95-100.
  • Clapham DE. Calcium Signalling. Cell, 1995; 80:259-269.

  • Patch clamp technique applied to sperm

    Format: Quicktime Movie
    Download - 13 MB
    Patch clamp technique applied to sperm.

    CONTACT US
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    Michelle Estrada Merry

    Address:
    David E. Clapham MD, PhD.
    Howard Hughes Medical Institute
    Department of Cardiology, Children's Hospital
    Department of Neurobiology, Harvard Medical School
    1309 Enders Research Building
    320 Longwood Avenue
    Boston, MA 02115

    Phone: 617-919-2680
    FAX: 617-731-0787
    E-Mail: David E Clapham
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