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We analyzed LTβR mRNA expression in piglets from birth to weaning and compared the differential expression between Escherichia coli F18-resistant and sensitive populations to determine whether this gene could be used as a genetic marker for E. coli F18 resistance. Sutai piglets of different age groups (8, 18, 30, and 35 days; N = 4 each) and piglets demonstrating resistance/sensitivity to E. coli F18 were used. LTβR expression levels were determined by real-time PCR. The LTβR expression levels in the lymph node, duodenum, and jejunum were significantly higher in 8-day-old piglets than in the other age groups (P &lt; 0.01), and the expression levels were significantly higher in the lungs of 8-day-old piglets than in 35-day-old piglets (P &lt; 0.01) and 30 day-old piglets (P &lt; 0.05). In liver tissue, the expression level was significantly higher in the 35-day-old piglets than in other age groups (P &lt; 0.01). In the stomach tissue, the expression level was significantly higher in 35-day-old piglets than in 18-day-old piglets (P &lt; 0.05). LTβR expression in the lymph nodes was significantly higher in the resistant group than in the sensitive group (P &lt; 0.01), but there was no significant difference in the other tissues (P &gt; 0.05). These results indicate that 8 days after birth is a crucial stage in the formation of mesentery lymph nodes and immune barriers in pigs, and increased expression of LTβR may be beneficial for developing resistance to E. coli F18.

Developmental expression of LTβR and differential expression in Escherichia coli F18 resistant/sensitive piglets