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- W2125146126 abstract "WSSV particles were detected in separated granular cells (GCs) and semigranular cells (SGCs) by in situ hybridisation from WSSV-infected crayfish and the prevalence of WSSV-infected GCs was 5%, whereas it was 22% in SGCs. This indicates that SGCs are more susceptible to WSSV and that this virus replicated more rapidly in SGCs than in GCs and as a result the number of SGCs gradually decreased from the blood circulation. The effect of haemocyte lysate supernatant (HLS), containing the degranulation factor (peroxinectin), phorbol 12-myristate 13-acetate (PMA), the Ca2+ ionophore A23187 on GCs from WSSV-infected and sham-injected crayfish was studied. The results showed that the percentage of degranulated GCs of WSSV-infected crayfish treated with HLS or PMA was significantly lower than that in the control, whereas no significant difference was observed when treated with the Ca2+ ionophore. It was previously shown that peroxinectin and PMA have a degranulation effect via intracellular signalling involving protein kinase C (PKC), whereas the Ca2+ ionophore uses an alternative pathway. HLS treatment of GCs and SGCs from WSSV-infected crayfish results in three different morphological types: non-spread, spread and degranulated cells. The non-spread cell group from both GCs and SGCs after treatment with HLS had more WSSV positive cells than degranulated cells, when detected by in situ hybridisation. Taken together, it is reasonable to speculate that the PKC pathway might be affected during WSSV infection. Another interesting phenomenon was that GCs from non-infected crayfish exhibited melanisation, when incubated in L-15 medium, while no melanisation was found in GCs of WSSV-infected crayfish. However, the phenoloxidase activities of both sham- and WSSV-injected crayfish in HLS were the same as well as proPO expression as detected by RT-PCR. This suggests that the WSSV inhibits the proPO system upstream of phenoloxidase or simply consumes the native substrate for the enzyme so that no activity is shown. The percentage of apoptotic haemocytes in WSSV-infected crayfish was very low, but it was significantly higher than that in the sham-injected crayfish on day 3 or 5 post-infection. The TEM observation in haematopoietic cells (hpt cells) suggests that WSSV infect specific cell types in haematopoietic tissue and non-granular hpt cells seem more favourable to WSSV infection." @default.
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- W2125146126 date "2006-05-01" @default.
- W2125146126 modified "2023-10-16" @default.
- W2125146126 title "White spot syndrome virus (WSSV) interaction with crayfish haemocytes" @default.
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- W2125146126 doi "https://doi.org/10.1016/j.fsi.2005.09.002" @default.
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