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2016 ; 22
(ä): 599-609
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Zingiber officinale attenuates retinal microvascular changes in diabetic rats via
anti-inflammatory and antiangiogenic mechanisms
#MMPMID27293376
Dongare S
; Gupta SK
; Mathur R
; Saxena R
; Mathur S
; Agarwal R
; Nag TC
; Srivastava S
; Kumar P
Mol Vis
2016[]; 22
(ä): 599-609
PMID27293376
show ga
PURPOSE: Diabetic retinopathy is a common microvascular complication of
long-standing diabetes. Several complex interconnecting biochemical pathways are
activated in response to hyperglycemia. These pathways culminate into
proinflammatory and angiogenic effects that bring about structural and functional
damage to the retinal vasculature. Since Zingiber officinale (ginger) is known
for its anti-inflammatory and antiangiogenic properties, we investigated the
effects of its extract standardized to 5% 6-gingerol, the major active
constituent of ginger, in attenuating retinal microvascular changes in rats with
streptozotocin-induced diabetes. METHODS: Diabetic rats were treated orally with
the vehicle or the ginger extract (75 mg/kg/day) over a period of 24 weeks along
with regular monitoring of bodyweight and blood glucose and weekly fundus
photography. At the end of the 24-week treatment, the retinas were isolated for
histopathological examination under a light microscope, transmission electron
microscopy, and determination of the retinal tumor necrosis factor-? (TNF-?),
nuclear factor-kappa B (NF-?B), and vascular endothelial growth factor (VEGF)
levels. RESULTS: Oral administration of the ginger extract resulted in
significant reduction of hyperglycemia, the diameter of the retinal vessels, and
vascular basement membrane thickness. Improvement in the architecture of the
retinal vasculature was associated with significantly reduced expression of NF-?B
and reduced activity of TNF-? and VEGF in the retinal tissue in the ginger
extract-treated group compared to the vehicle-treated group. CONCLUSIONS: The
current study showed that ginger extract containing 5% of 6-gingerol attenuates
the retinal microvascular changes in rats with streptozotocin-induced diabetes
through anti-inflammatory and antiangiogenic actions. Although precise molecular
targets remain to be determined, 6-gingerol seems to be a potential candidate for
further investigation.