Apoptosis Analysis Using Analysis Software

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Introduction

There are a number of apoptosis analysis methods that use imaging. When focusing on nuclei, such phenomena as chromatin aggregation, nuclei condensation and DNA cutting,etc. are observed along with the progress of apoptosis, which are recognizable from microscopic images. The following is an example of the analysis of nuclear transformation by using the images acquired by CV7000 and 「Nuclear Morphology」function of the analysis software.

Analysis Results

Images were acquired using multiple object lenses and analyzed by the analysis software. As a result, changes in the nuclear areas due to apoptosis were observed with any of the objective lenses(Fig. 1). In the created doseresponse curves of three factors (Fig. 2), both the 4X and 40X lenses gave almost the same results. In addition, bar charts of individual cell distribution in the wells with staurosporine concentrations of 0μM and 10μM (Fig. 3) and pie charts (Fig. 4) were created using Spotfire®, both of which clearly indicated apoptosis. In this way, the 「Nuclear Morphology」function of the analysis software enables multilateral analysis of changes in nuclear morphology, and stable analysis of images acquired by as low as 4X magnification object lenses, too.

Images captured using the CV7000 and recognition results

Fig. 1: Images captured by CV7000, and their recognition results
Based on the nuclear area per cell, live cells and cells with apoptosis are recognized and colored in green and red, respectively.
It is clearly shown that almost all nuclei are fragmented due to apoptosis in the wells with 10μM staurosporine.

Experiments

  1.  HeLa cells were cultured in 96-well plates with 10,000 cells/well for 24 hours.
  2.  Add Staurosporine, fix with formaldehyde four hours later, and stain nuclei with Hoechst33342.
  3.  CV7000 observation conditions are shown below: (wavelength: 405nm)
     
    Magnification Exposure time (405nm) Number of images (per well) Number of recognized cells (well average)
    4x 500 msec 1 3,452 cells
    10x 250 msec 4 3,028 cells
    20x 250 msec 9 1,243 cells
    40x 250 msec 16 493 cells

     

  4. Analyze captured images using the 「Nuclear Morphology」function of the analysis software in its advanced mode.
    • Extract nuclear areas from the images to recognize the nuclei with less than 100μm2 area as micronuclei fragmented due to apoptosis.
    • Calculate the area and average fluorescence intensity of the nuclei and fragmented micronuclei, respectively, as well as the number of micronuclei.

Fig. 2(a): Scatter diagram of  individual cells (X-axis: total intensity, Y-axis: mean intensity)

Fig. 2: Staurosporine dose-response curves: Imaged with (a)4x or (b)40x lens

Fig. 2(b): Scatter diagram of individual cells (X-axis: total intensity, Y-axis: max. intensity)

Fig.3 Cell number distribution graphs (40X)

Images captured using the CV7000 and recognition results

Fig. 4 (a): Pie-chart : Ratio of cells at various staurosporine concentrations. (Magnification: 40x)
The ratio of cells with nuclear fluorescence intensity of 800 or more are colored in green.

Images captured using the CV7000 and recognition results

Fig. 4 (b): Pie-chart: Ratios of cells at various staurosporine concentrations. (Magnification: 40x)
The ration of cells with one or more fragmented nuclear granules are colored in green.


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