Applications of computerized microscopic image analysis in infectious diseases

Area of Science:

• Cellular biology
• Microscopy
• Immunology

Background:

• Computerized microscopy enables precise measurement of cellular morphology and physiology.
• Current systems analyze lysosomal enzymes, pH, calcium, viral nucleic acids, and cell movement.

Purpose of the Study:

• To evaluate the application of computerized microscopy image analysis in studying infectious diseases.
• To investigate the impact of virulent microorganisms on phagocyte function.

Main Methods:

• Utilizing computerized microscopy systems with photomultiplier tubes or cameras and image processors.
• Measuring lysosomal enzyme activity (acid phosphatase, beta-glucuronidase, lysozyme), phagosomal acidification, intracellular calcium, and cellular movement (chemotaxis, chemokinesis).
• Detecting viral nucleic acids using in situ hybridization.

Main Results:

• Intracellular proliferation of virulent microorganisms correlates with decreased acid phosphatase, beta-glucuronidase, and lysozyme activity.
• Virulent *Toxoplasma gondii*, *Legionella pneumophila*, and *Nocardia asteroides* were found to inhibit phagosomal acidification.
• Alterations in intracellular calcium dynamics were observed to affect phagocytic function.
• The AIDS virus was detected in cultured lymphocytes, and cellular chemotaxis/chemokinesis were quantified.

Conclusions:

• Computerized microscopy provides powerful tools for quantitative analysis of cellular responses to infectious agents.
• These methods offer insights into pathogen-host interactions, particularly concerning phagocyte dysfunction.
• Future technological advancements in microscopic image analysis will broaden applications in infectious disease investigation.