Long-Term Feeding of the cis-9,trans-11 Isomer of Conjugated Linoleic Acid Reinforces the Specific Immune Response in Rats

Carolina Ramírez-Santana, Cristina Castellote, Margarida Castell, Montserrat Rivero, Maria Rodríguez-Palmero, Àngels Franch, Francisco J. Pérez-Cano
2008 Journal of Nutrition  
Several effects on the immune system have been ascribed to the cis9,trans11 conjugated linoleic acid (CLA) isomer. We studied whether feeding a diet enriched with an 80:20 CLA isomer mix of cis9,trans11 and trans10,cis12 CLA from gestation to adulthood affects the capacity of adult rats to achieve a specific immune response. Pregnant Wistar rats were fed a 1% CLA diet or a control diet beginning on d 7 of gestation. Weaned pups received the same diet as dams until they were 15 wk old. Rats from
more » ... both groups were immunized with ovalbumin (OVA) when they were 9 wk old. Dietary CLA enhanced splenocyte OVA-specific proliferation by ;50% (P , 0.05) and decreased the mitogen-induced proliferative responses of these cells by ;10-20% (P , 0.05). The diminished splenocyte proliferative response was accompanied by a lower interleukin-2 secretion (P , 0.05). Long-term CLA supplementation did not increase serum, spleen, or mesenteric lymph node production of OVA-specific antibodies (Ab) or the number of spleen anti-OVA Ab-secreting cells. Interestingly, dietary CLA increased intestinal anti-OVA IgA production by ;75% (P , 0.05). In conclusion, a 1% CLA diet administered from gestation to adulthood enhanced specific systemic cell-mediated immunity as well as the mucosal IgA immune response, whereas it downregulated the polyclonal activation of the immune system. These data support the long-term effects of dietary cis9,trans11 CLA isomer on the immune system.
doi:10.3945/jn.108.097428 pmid:19056641 fatcat:upcmco7dtbf4bhw6xh6umofjaq