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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Histochem+Cytochem
2014 ; 62
(6
): 450-459
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Human Eosinophil Leukocytes Express Protein Disulfide Isomerase in Secretory
Granules and Vesicles: Ultrastructural Studies
#MMPMID24670795
Dias FF
; Amaral KB
; Carmo LA
; Shamri R
; Dvorak AM
; Weller PF
; Melo RC
J Histochem Cytochem
2014[Jun]; 62
(6
): 450-459
PMID24670795
show ga
Protein disulfide isomerase (PDI) has fundamental roles in the oxidative folding
of proteins in the endoplasmic reticulum (ER) of eukaryotic cells. The study of
this molecule has been attracting considerable attention due to its association
with other cell functions and human diseases. In leukocytes, such as neutrophils,
PDI is involved with cell adhesion, signaling and inflammation. However, the
expression of PDI in other leukocytes, such as eosinophils, important cells in
inflammatory, allergic and immunomodulatory responses, remains to be defined.
Here we used different approaches to investigate PDI expression within human
eosinophils. Western blotting and flow cytometry demonstrated high PDI expression
in both unstimulated and CCL11/eotaxin-1-stimulated eosinophils, with similar
levels in both conditions. By using an immunogold electron microscopy technique
that combines better epitope preservation and secondary Fab-fragments of
antibodies linked to 1.4-nm gold particles for optimal access to microdomains, we
identified different intracellular sites for PDI. In addition to predictable
strong PDI labeling at the nuclear envelope, other unanticipated sites, such as
secretory granules, lipid bodies and vesicles, including large transport vesicles
(eosinophil sombrero vesicles), were also labeled. Thus, we provide the first
identification of PDI in human eosinophils, suggesting that this molecule may
have additional/specific functions in these leukocytes.