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- The characteristics of an inhibitor of infectious pancreatic necrosis virus (IPNV)
found in normal rainbow trout serum (RTS) were studied. The serum inhibitor had a
molecular weight of approximately 150 kDa and was dependent on divalent cations,
either Ca²⁺ or Mg²⁺. It was stable at temperatures up to 50°C and at a pH range between
4-10. The inhibitor directly inactivated the virus and the inhibition level was dependent
on cell densities and on the time at which virus was exposed to RTS. The level of virus
inhibition by RTS was altered by the cell line in which virus was produced. IPNV was
more efficiently inhibited by RTS in salmonid cell lines than in non-salmonid cell lines.
Most of the salmonid sera tested showed inhibition, while non-salmonid sera did not
inhibit IPNV replication. Rainbow trout continuously showed a significant level of
inhibition in their serum after 23 weeks post hatch.
Three isolates of IPNV were passaged five times in RTG-2 cells with either
MEM-10 or MEM-10 with 1% rainbow trout serum and virus from each passage were
tested for RTS sensitivity in vitro and virulence in vivo. The mortality level in brook trout
fry was highly variable during viral passages, ranging between 30-89%. The RTS
sensitivity and virulence were changed during viral passages, and these changes were
dependent on cell culture conditions and IPNV isolate used. It was found that an IPNV
crayfish isolate passaged in RTG-2 cells with MEM-10 showed significantly increased
RTS sensitivity. This was, however, not correlated with decreased virulence. All three
isolates showed identical antigenicity patterns with a panel of 11 monoclonal antibodies,
irrespective of viral passage conditions.
Clones prepared from an IPNV-Jasper (Ja) population which had been twice
passed through brook trout were heterogeneous with respect to RTS sensitivity, serotype,
and cDNA sequences. Eight percent of clones (4/50) were very sensitive to RTS (Ja-S),
as was the parent strain, and eighty four percent of clones (42/50) showed a mid-range of
RTS sensitivity. The final eight percent of clones (4/50) were RTS resistant (Ja-R).
Enzyme immunodot assay revealed that Ja-S clones and Ja-R clones differed by several
epitopes. Ja-S and Ja-R had significant differences in their cDNA sequences for the
capsid protein VP2. These two strains shared 80.7% and 86% identity in nucleic acid and
in amino acid sequences, respectively.
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| Digitization Specifications |
- File scanned at 300 ppi (Monochrome, 8-bit Grayscale) using ScandAll PRO 1.8.1 on a Fi-6770A in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
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| Additional Information |
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Previous issue date: 2000-12-12
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