Protective Effects Induced by Two Polyphenolic Liquid Complexes from Olive (Olea europaea, mainly Cultivar Coratina) Pressing Juice in Rat Isolated Tissues Challenged with LPS

MOMAST((®)) HY100 and MOMAST((®)) HP30 are polyphenolic liquid complexes from olive pressing juice with a total polyphenolic content of 100 g/kg (at least 50% as hydroxytyrosol) and 36 g/kg (at least 30% as hydroxytyrosol), respectively. We investigated the potential protective role of MOMAST((®)) HY100 and MOMAST((®)) HP30 on isolated rat colon, liver, heart, and prefrontal cortex specimens treated with Escherichia coli lipopolysaccharide (LPS), a validated ex vivo model of inflammation, by measuring the production of prostaglandin (PG)E(2), 8-iso-PGF(2α), lactate dehydrogenase (LDH), as well as cyclooxygenase (COX)-2, tumor necrosis factor α (TNFα), and inducible nitric oxide synthase (iNOS) mRNA levels. MOMAST((®)) HY100 decreased LPS-stimulated PGE(2) and LDH levels in all tested tissues. Following treatment with MOMAST((®)) HY100, we found a significant reduction in iNOS levels in prefrontal cortex and heart specimens, COX-2 and TNFα mRNA levels in heart specimens, and 8-iso-PGF(2α) levels in liver specimens. On the other hand, MOMAST((®)) HP30 was found to blunt COX-2, TNFα, and iNOS mRNA levels, as well as 8-iso-PGF(2α) in cortex, liver, and colon specimens. MOMAST((®)) HP30 was also found to decrease PGE(2) levels in liver specimens, while it decreased iNOS mRNA, LDH, and 8-iso-PGF(2α) levels in heart specimens. Both MOMAST((®)) HY100 and MOMAST((®)) HP30 exhibited protective effects on multiple inflammatory and oxidative stress pathways.