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Related Concept Videos

Outer Layers of the Cell Envelope01:18

Outer Layers of the Cell Envelope

The outermost layers of prokaryotic cells play a critical role in their survival, virulence, and interaction with the environment. These layers, often composed of polysaccharides, polypeptides, or proteins, form protective and adhesive structures that vary in organization and function.Capsules and Slime LayersCapsules are highly organized, tightly bound layers that firmly attach to the bacterial cell wall. Capsules are usually made of polysaccharides, though some are made of polypeptides. These...
Glycocalyx and its Functions01:14

Glycocalyx and its Functions

The glycocalyx is a carbohydrate-rich, fuzzy-appearing layer on the outer surface of the cell membrane. It is highly hydrophilic, because of this it attracts large amounts of water to the cell's surface. This aids the cell's interaction with the watery environment and also helps it to obtain substances dissolved in the water. It is also important for cell identification, self/non-self determination, and embryonic development and is used in cell-to-cell attachments to form tissues.
Components of...
Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
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Colonisation of Pathogens01:25

Colonisation of Pathogens

Pathogen colonization of host tissues is a critical step in the development of infectious diseases. Various pathogenic microorganisms, including bacteria, fungi, viruses, and protozoa, have evolved complex strategies to attach to, invade, and persist within host environments. These mechanisms enable pathogens to establish infections, evade immune responses, and resist antimicrobial treatments.Attachment to Host CellsIn bacteria, colonization typically begins with adherence to host epithelial...
Surface Membrane Barriers01:18

Surface Membrane Barriers

The skin and mucous membranes serve as the primary line of defense against pathogens by providing both physical and chemical protection. These barriers are essential in preventing the entry and establishment of microbes, thereby maintaining the integrity of the host.
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Defense Mechanism Against Infection

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Related Experiment Video

Updated: May 20, 2026

Size Matters: Measurement of Capsule Diameter in Cryptococcus neoformans
08:24

Size Matters: Measurement of Capsule Diameter in Cryptococcus neoformans

Published on: February 27, 2018

The Cryptococcus neoformans capsule: a sword and a shield.

Teresa R O'Meara1, J Andrew Alspaugh

  • 1Department of Medicine, Duke University School of Medicine, Durham, North Carolina, USA.

Clinical Microbiology Reviews
|July 6, 2012
PubMed
Summary
This summary is machine-generated.

Cryptococcus neoformans uses a polysaccharide capsule to establish chronic infections. Host stimuli trigger signaling pathways that regulate capsule formation, aiding fungal survival.

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Size Matters: Measurement of Capsule Diameter in Cryptococcus neoformans
08:24

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Published on: February 27, 2018

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08:08

Automated Measurement of Cryptococcal Species Polysaccharide Capsule and Cell Body

Published on: January 11, 2018

Complementary Use of Microscopic Techniques and Fluorescence Reading in Studying Cryptococcus-Amoeba Interactions
10:56

Complementary Use of Microscopic Techniques and Fluorescence Reading in Studying Cryptococcus-Amoeba Interactions

Published on: June 22, 2019

Area of Science:

  • Medical Mycology
  • Molecular Biology
  • Pathogen-Host Interactions

Background:

  • Cryptococcus neoformans is a human fungal pathogen known for its polysaccharide capsule.
  • Capsule formation is crucial for C. neoformans virulence, chronic infection, and dormancy.
  • The capsule's plasticity reflects the complex host-parasite relationship.

Purpose of the Study:

  • To review host stimuli that activate signaling pathways in C. neoformans.
  • To examine the downstream transcriptional responses regulating capsule formation.
  • To understand the role of signaling in C. neoformans virulence.

Main Methods:

  • Review of existing literature on Cryptococcus neoformans signaling and capsule regulation.
  • Analysis of transcriptional responses to host-specific stimuli.
  • Focus on conserved signaling pathways coopted for capsule synthesis.

Main Results:

  • Host stimuli precisely regulate capsule biosynthesis, transport, and cell surface maintenance.
  • Transcriptional responses to signaling cascades are essential for robust encapsulation.
  • C. neoformans adapts its capsule composition in response to host conditions.

Conclusions:

  • Signal transduction pathways are key regulators of C. neoformans capsule formation.
  • Understanding these pathways offers insights into fungal pathogenesis and host immune evasion.
  • The regulation of encapsulation is a complex, multi-step process vital for fungal survival.