Innate Immune Recognition, Integrated Stress Response, Infection, and Tumorigenesis.

Area of Science:

• Immunology
• Cellular Biology
• Molecular Biology

Background:

• Pattern recognition receptors (PRRs) detect pathogen-associated molecular patterns (PAMPs) and damage-associated molecular patterns (DAMPs), initiating cellular stress and innate immune responses.
• Signaling cascades involving MyD88-dependent pathways and myddosome formation are activated upon PRR engagement.
• Cellular stress, including endoplasmic reticulum stress and mitochondrial dysfunction, triggers autophagy and the unfolded protein response.

Purpose of the Study:

• To elucidate the intricate signaling networks initiated by PRRs in response to PAMPs/DAMPs.
• To understand the role of MyD88-dependent pathways and inflammasome activation in cellular defense mechanisms.
• To highlight the commonalities in PRR-mediated signaling during microbial infections and tumorigenesis.

Main Methods:

• Analysis of PRR signaling pathways.
• Investigation of MyD88-dependent signaling and myddosome formation.
• Examination of endoplasmic reticulum stress, autophagy, and inflammasome activation.

Main Results:

• PRR engagement triggers MyD88-dependent signaling and myddosome formation, initiating innate immune processes.
• Cellular autonomous defense mechanisms orchestrate responses to insults, involving ER stress, autophagy, and mitochondrial signaling.
• Inflammasome activation is a downstream consequence of these interconnected signaling events.

Conclusions:

• PRR signaling is central to cellular stress responses and innate immunity, involving conserved pathways like MyD88 and inflammasomes.
• Cell-autonomous defense mechanisms are critical for resolving cellular insults and are activated by ER and mitochondrial stress.
• The elucidated signaling pathways are relevant to both host defense against pathogens and the development of cancer.