Category

Archives

Developmental expression of STATs, nuclear factor-κB and inflammatory genes in the jejunum of piglets during weaning

The signal transducer and activator of transcription (STAT) proteins play essential roles in apoptosis, proliferation and survival. However, the role of STATs in intestinal inflammation during weaning is unclear. This study aimed to investigate developmental expression of STATs, nuclear factor-κB (NF-κB) and inflammatory genes in the jejunum of piglets during weaning. Thirty-two piglets were weaned at 21d and sacrificed at 0, 1, 7, or 14d (n=8) after weaning. Villus height and the villus height/crypt depth ratio were decreased, whereas crypt depth was increased in the jejunum at 7 and 14d after weaning. In addition, the mRNA levels of interferon-γ (IFN-γ), inducible nitric oxide synthase (iNOS), IL-6, IL-8, IL-12 and IL-22 were increased in the jejunum at 7 and 14d after weaning, whereas transforming growth factor-β (TGF-β), suppressor of cytokine signaling 3 (SCOS3) and arginase-1 was decreased. Neutrophil infiltration was increased in the mucosa of the jejunum after weaning. Moreover, phosphorylation of IκB-α, NF-κB, AKT and STAT-3 was increased. However, the phosphorylation of STAT-1 (at 7 and 14d) and STAT-6 (at 1 and 7d) was suppressed in the jejunum after weaning. Treatment of porcine jejunal epithelial (IPEC-J2) cells with the STAT inhibitors fludarabine, niclosamide and teriflunomide, which inhibit the phosphorylation of STAT-1, STAT-3 and STAT-6, respectively, weakened the defense capacity of these cells against bacterial infection. In conclusion, weaning caused severe inflammation associated with activation of the NF-κB and STAT-3 pathways and suppression of STAT-1 and STAT-6 in the jejunum of piglets.

Related Products

Cat.No. Product Name Information Publications Customer Product Validation
S3030 Niclosamide Niclosamide (Niclocide) can inhibit DNA replication and inhibit STAT3 with IC50 of 0.7 μM in a cell-free assay. Niclosamide selectively inhibited the phosphorylation of STAT3 and had no obvious inhibition against the activation of other homologues (e.g., STAT1 and STAT5). (26) (6)
S1229 Fludarabine Phosphate Fludarabine Phosphate (F-ara-A, NSC 312887) is an analogue of adenosine and deoxyadenosine, which is able to compete with dATP for incorporation into DNA and inhibit DNA synthesis. (20) (1)

Related Targets