Abstract
ABSTRACTThe human granulocytic ehrlichiosis (HGE) agent resides and multiplies exclusively in cytoplasmic vacuoles of granulocytes. Double immunofluorescence labeling was used to characterize the nature of the HGE agent replicative inclusions and to compare them with inclusions containing the human monocytic ehrlichia,Ehrlichia chaffeensis, in HL-60 cells. Although bothEhrlichiaspp. can coinfect HL-60 cells, they resided in separate inclusions. Inclusions of bothEhrlichiaspp. were not labeled with either anti-lysosome-associated membrane protein 1 or anti-CD63. Accumulation of myeloperoxidase-positive granules were seen around HGE agent inclusions but not aroundE. chaffeensisinclusions. 3-(2,4-Dinitroanilino)-3′-amino-N-methyldipropylamine and acridine orange were not localized to either inclusion type. Vacuolar-type H+-ATPase was not colocalized with HGE agent inclusions but was weakly colocalized withE. chaffeensisinclusions.E. chaffeensisinclusions were labeled with the transferrin receptor, early endosomal antigen 1, and rab5, but HGE agent inclusions were not. Some HGE agent andE. chaffeensisinclusions colocalized with major histocompatibility complex class I and II antigens. These two inclusions were not labeled for annexins I, II, IV, and VI; α-adaptin; clathrin heavy chain; or β-coatomer protein. Vesicle-associated membrane protein 2 colocalized to both inclusions. The cation-independent mannose 6-phosphate receptor was not colocalized with either inclusion type. Endogenously synthesized sphingomyelin, from C6-NBD-ceramide, was not incorporated into either inclusion type. Brefeldin A did not affect the growth of eitherEhrlichiasp. in HL-60 cells. These results suggest that the HGE agent resides in inclusions which are neither early nor late endosomes and does not fuse with lysosomes or Golgi-derived vesicles, whileE. chaffeensisresides in an early endosomal compartment which accumulates the transferrin receptor.
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Dates
Type | When |
---|---|
Created | 5 years, 7 months ago (Dec. 31, 2019, 10:33 a.m.) |
Deposited | 1 year, 11 months ago (Sept. 24, 2023, 10:38 a.m.) |
Indexed | 4 months, 4 weeks ago (March 29, 2025, 1:25 p.m.) |
Issued | 26 years, 5 months ago (March 1, 1999) |
Published | 26 years, 5 months ago (March 1, 1999) |
Published Print | 26 years, 5 months ago (March 1, 1999) |
@article{Mott_1999, title={Human Granulocytic Ehrlichiosis Agent andEhrlichia chaffeensisReside in Different Cytoplasmic Compartments in HL-60 Cells}, volume={67}, ISSN={1098-5522}, url={http://dx.doi.org/10.1128/iai.67.3.1368-1378.1999}, DOI={10.1128/iai.67.3.1368-1378.1999}, number={3}, journal={Infection and Immunity}, publisher={American Society for Microbiology}, author={Mott, Jason and Barnewall, Roy E. and Rikihisa, Yasuko}, editor={Orndorff, P. E.}, year={1999}, month=mar, pages={1368–1378} }