Cryptococcus Staining
Cryptococcus Staining - Related Videos
11:07
Macrophage Cholesterol Depletion and Its Effect on the Phagocytosis of Cryptococcus neoformans
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Cited by 22 •
2014
In this article, a protocol for infection of macrophages with Cryptococcus neoformans is described. Also, a method for sterol depletion from the macrophages is explained. These protocols provide a guide to study fungal infections in vitro and examine the role of sterols in such infections.
03:25
A Lactate Dehydrogenase Release Assay to Detect Cryptococcus neoformans Infection in Macrophages
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2025
In this video, we demonstrate a cytotoxicity assay to assess Cryptococcus neoformans, a pathogenic fungus, infection in macrophages. The cytotoxicity is determined by the release of cytoplasmic lactate dehydrogenase enzyme due to macrophage lysis caused by Cryptococcus neoformans infection.
07:32
Biolistic Transformation of a Fluorescent Tagged Gene into the Opportunistic Fungal Pathogen Cryptococcus neoformans
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2015
Biolistic transformation is a method used to generate stable integration of DNA into the genome of the opportunistic pathogen Cryptococcus neoformans through homologous recombination. We will demonstrate biolistic transformation of a construct, which has the gene encoding acetate kinase fused to the fluorescent tag mCherry into C. neoformans.
11:33
Microscopy and Staining: Gram, Capsule, and Endospore Staining
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2023
Source: Rhiannon M. LeVeque1, Natalia Martin1, Andrew J. Van Alst1, and Victor J. DiRita1 1 Department of Microbiology and Molecular Genetics, Michigan State University, East Lansing, Michigan, United States of America Bacteria are diverse microorganisms found nearly everywhere on Earth. Many properties help distinguish them from each other, including but not limited to Gram-staining type, shape and arrangement, production of capsule, and formation of spores. To observe these properties, one...
10:02
Visualizing Non-lytic Exocytosis of Cryptococcus neoformans from Macrophages Using Digital Light Microscopy
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Cited by 7 •
2014
We describe how to visualize macrophage-C. neoformans (Cn) interactions in real time, with specific emphasis on the process of non-lytic exocytosis using digital light microscopy. Using this technique individually infected macrophages can be studied to ascertain various aspects of this phenomenon.
FAQs
The capsule creates contrast by excluding India ink rather than taking up the dye. A stained background surrounds the yeast, while the polysaccharide capsule remains optically clear, producing a halo that can be recognized microscopically. This mechanism makes the capsule itself the key visual feature and helps investigators identify encapsulated yeast in a clinical specimen.
The capsule supplies the visual marker that separates the yeast from the stained background. Its polysaccharide material excludes India ink, creating a halo, and can also be highlighted in tissue with mucicarmine. Consequently, interpretation focuses on the capsule-associated appearance rather than relying only on the yeast body, which supports recognition across different specimen types.
India ink is used as a negative stain: the surrounding material becomes dark while the capsule remains unstained. Mucicarmine serves a different role in tissue, where it highlights the capsule. The distinction matters because the two approaches adapt capsule visualization to different clinical materials, allowing microscopy to support investigation in fluid, respiratory, or tissue specimens.
Cryptococcus staining can be applied to cerebrospinal fluid, respiratory samples, or tissue, depending on which clinical material is available for investigation. The choice matters because capsule visualization must occur within the specimen under examination. In immunocompromised patients, a rapid microscopic result can provide early evidence that supports continued diagnostic workup.
A positive microscopic appearance should lead to confirmatory or complementary testing rather than end the investigation. The staining result can guide culture and antigen detection, which add different forms of evidence to the microscopic observation. Using these methods together strengthens disease investigation by connecting visible morphology with laboratory tests that assess the organism or an infection-associated signal.
In immunology and infection studies, the capsule is more than a morphological feature: it is the structure that determines how the organism appears in these stains. Observing its halo or tissue-associated staining pattern helps connect a microbial surface characteristic with infection investigation, especially when clinical specimens come from immunocompromised patients. This bridges microscopy and clinical context.