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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 Microbiol+Immunol
2017 ; 61
(8
): 318-327
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Determination of the cell tropism of serotype 1 feline infectious peritonitis
virus using the spike affinity histochemistry in paraffin-embedded tissues
#MMPMID28675506
Microbiol Immunol
2017[Aug]; 61
(8
): 318-327
PMID28675506
show ga
Unlike for serotype II feline coronaviruses (FCoV II), the cellular receptor for
serotype I FCoV (FCoV I), the most prevalent FCoV serotype, is unknown. To
provide a platform for assessing the pattern by which FCoV I attaches to its host
receptor(s), HEK293 cell lines that stably express the ectodomains of the spike
(S) proteins derived from a FCoV I feline enteric coronavirus strain UU7 (FECV
UU7) and a feline infectious peritonitis virus strain UU4 (FIPV UU4) were
established. Using the recombinant S proteins as probes to perform S protein
affinity histochemistry in paraffin-embedded tissues, although no tissue or
enteric binding of FECV UU7 S protein was detected, it was found that by
immunohistochemistry that the tissue distribution of FIPV UU4 S protein-bound
cells correlated with that of FIPV antigen-positive cells and lesions associated
with FIP and that the affinity binding of FIPV UU4 S protein on macrophages was
not affected by enzymatic removal of host cell-surface sialic acid with
neuraminidase. These findings suggest that a factor(s) other than sialic acid
contribute(s) to the macrophage tropism of FIPV strain UU4. This approach allowed
obtaining more information about both virus-host cell interactions and the
biological characteristics of the unidentified cellular receptor for FCoV I.