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Ethyl Acetate Fraction from Trichilia catigua Confers Partial Neuroprotection in Components of the Enteric Innervation of the Jejunum in Diabetic Rats.

BACKGROUND/AIMS
Diabetes causes damage to the enteric nervous system. The enteric nervous system consists of neurons and enteric glial cells (EGCs). The present study evaluated the effects of an ethyl-acetate fraction (EAF) from Trichilia catigua (T. catigua; 200 mg/kg) on the total population of enteric neurons (HuC/D-immunoreactive [IR]) and EGCs (S100-IR and glial fibrillary acidic protein [GFAP]-IR) in the total preparation and jejunal mucosa in diabetic rats.


METHODS
The animals were distributed into four groups: normoglycemic rats (N), diabetic rats (D), normoglycemic rats that received the EAF (NC), and diabetic rats that received the EAF (DC). The jejunum was processed for immunohistochemistry to evaluate HuC/D, S100, and GFAP immunoreactivity. The expression of S100 and GFAP proteins was also quantified by Western blot.


RESULTS
The D group exhibited a decrease in the number of neurons and EGCs, an increase in the area of cell bodies, an increase in S100 protein expression, a decrease in GFAP protein expression, and a decrease in S100-IR and GFAP-IR EGCs in the jejunal mucosa. The DC group exhibited a decrease in the number of neurons and EGCs, a decrease in the area of cell bodies, a decrease in S100 and GFAP protein expression, and a decrease in S100-IR and GFAP-IR EGCs in the jejunal mucosa. The NC group exhibited maintenance of the number of neurons and EGCs, an increase in the area of cell bodies, and a decrease in S100 and GFAP protein expression.


CONCLUSION
The EAF from T. catigua partially conferred protection against diabetic neuropathy in the enteric nervous system.