Cited by 73Lipid metabolism and biosynthesisTrypanosoma species research and implicationsImmune Response and Inflammation

Lipid bodies: structural markers of inflammatory macrophages in innate immunity

Melo, R. C. N., Fabrino, D. L., Dias, F. F., Parreira, G. G.·2006·Inflammation Research

Abstract

Objective and design The correlation between innate immune responses and formation of cytoplasmic lipid bodies (LBs) was investigated in vivo in inflammatory macrophages from rats infected with Trypanosoma cruzi, the intracellular parasite which causes Chagas' disease. Material and methods We used an experimental model of high-dose irradiation prior to infection, which depletes the humoral and cellular immune responses except for the phagocytic activity of macrophages. Rats, irradiated or not, were infected with T. cruzi and macrophages from different origins (peritoneum, heart, uterus) were studied by transmission electron microscopy (TEM). Results As documented by quantitative TEM, innate immune responses induced prominent formation, structural changes and intracellular interactions of LBs. LBs significantly increased their size and changed their osmiophilia in response to both infection alone and when macrophages were challenged with irradiation-induced increased parasite load. Remarkably, a consistent LB-phagolysosome association was identified. LBs were surrounding, attached to or internalized by phagolysosomes. Conclusions We demonstrated that LBs are dynamic organelles notably involved in the host response to acute T. cruzi infection, an event that may be important for pathogen control during innate immunity. Our findings highlight LBs as structural markers of the innate immune responses in phagocytic cells.

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Crossref · 10.1007/s00011-006-5205-0

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Authors
Melo, R. C. N., Fabrino, D. L., Dias, F. F., & Parreira, G. G.
Affiliations
  • Universidade Federal de Juiz de Fora (BR)
  • Universidade Federal de Minas Gerais (BR)
Corresponding author
Melo, R. C. N.
Venue
Inflammation Research
Published
2006-08
Volume
55
Issue
8
Pages
342-348
ISSN
  • 1023-3830 (ISSN-L)
  • 1420-908X
OpenAlex
W2075575974
Cited by
73
References
31
Citations by year
2026: 2 · 2025: 4 · 2024: 2 · 2023: 2 · 2022: 4 · 2021: 4 · 2020: 5 · 2019: 4 · 2018: 5 · 2017: 2 · 2016: 5 · 2015: 3 · 2014: 9 · 2013: 2 · 2012: 5
FWCI
1.20
Type
journal article
Language
en
Open access
closed
Locations
  • Inflammation Research (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Conselho Nacional de Desenvolvimento Científico e Tecnológico
  • Fundação de Amparo à Pesquisa do Estado de Minas Gerais
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Lipid metabolism and biosynthesis
  • Health Sciences › Medicine › Epidemiology › Trypanosoma species research and implications
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
Keywords
lipid droplets, inflammatory macrophages, innate immunity, Trypanosoma cruzi, Chagas disease, phagolysosomes, macrophage phagocytosis, infection intensity, host-pathogen interaction
MeSH terms
Animals, Cytoplasm, Disease Models, Animal, Female, Immunity, Innate, Inflammation, Lipids, Lysosomes, Macrophages, Phagocytosis, Trypanosoma cruzi, Chagas Disease, Biomarkers, Microscopy, Electron, Transmission, Rats

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