การป้องกันการติดเชื้อไวรัส defense against viral infection (49), and it has been
และจะได้รับการแสดงให้เห็นว่าผมชนิดและชนิดที่สองIFN (IFN? demonstrated that type I and type II IFN (IFN-/ and IFN-,
?,. ตามลำดับrespectively) have antiviral activity against many viruses (5, 29).
หลังจากที่ทางเดิน After the IFN pathway is stimulated transcriptional upregulation
การถอดรหัสของหลายร้อยยีนeffector กลุ่มของเราได้แสดงให้เห็นว่าการปรับสภาพของเซลล์เพาะเลี้ยงที่มีประเภทI (12, 14, 37) ( ( มีส่วนร่วมในกระบวนการนี้ of hundreds of effector genes occurs (17, 52). Our group
has demonstrated that pretreatment of cell cultures with type
I and type II IFNs can dramatically inhibit FMDV replication
(12, 14, 37), and at least two type I IFN-stimulated genes
(ISGs), double-stranded-RNA-dependent protein kinase
(PKR) and 2,5-oligoadenylate synthetase (OAS)/RNase L,
are involved in this process (12, 16). Furthermore, swine pretreated
with an Ad5 vector expressing porcine IFN- (Ad5-
pIFN-) or porcine IFN- (Ad5-CI-pIFN-) are sterilely protected
when challenged with FMDV 1 day later (13, 37) and
protection lasted 3 to 5 days (36). Interestingly, the action of
type I IFN in combination with type II IFN can synergistically
block virus replication in vivo since swine inoculated with a
combination of Ad5-CI-pIFN- and Ad5-CI-pIFN-, at doses
that alone do not protect against FMDV, are completely protected
against clinical disease and do not develop viremia (37).
The protection conferred in IFN-treated pigs correlated with
an increase of the 10-kDa IFN--inducible protein 10 (IP-10),
indoleamine 2,3-dioxygenase (INDO), and OAS mRNA expression
in peripheral blood mononuclear cells (PBMCs), and
this upregulation was synergistic in the group of animals
treated with the combination of Ad5-CI-pIFN- and Ad5-CIpIFN-
. Nevertheless, this approach has only been partially
successful in cattle, since Ad5-pIFN--treated animals
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