The interaction between Histoplasma capsulatum cell wall carbohydrates and host components: relevance in the immunomodulatory role of histoplasmosis

• Main Authors: Patricia Gorocica, Maria Lucia Taylor, Noé Alvarado-Vásquez, Armando Pérez-Torres, Ricardo Lascurain, Edgar Zenteno
• Format: Article
• Language: English
• Published: Instituto Oswaldo Cruz, Ministério da Saúde 2009-05-01
• Series: Memórias do Instituto Oswaldo Cruz.
• Subjects: Histoplasma capsulatum; carbohydrates; glucans; polysaccharides; immunomodulation
• Online Access: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0074-02762009000300016

Histoplasma capsulatum is an intracellular fungal pathogen that causes respiratory and systemic disease by proliferating within phagocytic cells. The binding of H. capsulatum to phagocytes may be mediated by the pathogen's cell wall carbohydrates, glucans, which consist of glucose homo and hetero-polymers and whose glycosydic linkage types differ between the yeast and mycelial phases. The ±-1,3-glucan is considered relevant for H. capsulatum virulence, whereas the ²-1,3-glucan is antigenic and participates in the modulation of the host immune response. H. capsulatum cell wall components with lectin-like activity seem to interact with the host cell surface, while host membrane lectin-like receptors can recognize a particular fungal carbohydrate ligand. This review emphasizes the relevance of the main H. capsulatum and host carbohydrate-driven interactions that allow for binding and internalization of the fungal cell into phagocytes and its subsequent avoidance of intracellular elimination.