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2015 ; 13
(1
): 40-52
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A primary role for kinin B1 receptor in inflammation, organ damage, and lethal
thrombosis in a rat model of septic shock in diabetes
#MMPMID26413099
Tidjane N
; Hachem A
; Zaid Y
; Merhi Y
; Gaboury L
; Girolami JP
; Couture R
Eur J Inflamm
2015[Apr]; 13
(1
): 40-52
PMID26413099
show ga
Diabetes mellitus and septic shock increase the incidence of mortality by
thrombosis. Although kinin B1 receptor (B1R) is involved in both pathologies, its
role in platelet function and thrombosis remains unknown. This study investigates
the expression, the inflammatory, and pro-thrombotic effects of B1R in a model of
septic shock in diabetic rats. Sprague-Dawley rats were made diabetic with
streptozotocin (STZ) (65 mg/kg, i.p.). Four days later, control and STZ-diabetic
rats were injected with lipopolysaccharide (LPS) (2 mg/kg, i.p.) or the vehicle.
B1R antagonist (SSR240612, 10 mg/kg by gavage) was given either acutely (12 and
24 h prior to endpoint analysis) or daily for up to 7 days. Moreover, a 7-day
treatment was given either with cyclooxygenase (COX)-2 inhibitor (niflumic acid,
5 mg/kg, i.p.), non-selective COX-1 and COX-2 inhibitor (indomethacin, 10 mg/kg,
i.p.), non-selective nitric oxide synthase (NOS) inhibitor (L-NAME, 50 mg/kg by
gavage), iNOS inhibitor (1400W, 5 mg/kg, i.p.), or heparin (100 IU/kg, s.c.). The
following endpoints were measured: edema and vascular permeability (Evans blue
dye), B1R expression (qRT-PCR, western blot, flow cytometry), aggregation in
platelet-rich plasma (optical aggregometry), and organ damage (histology). Rats
treated with STZ, LPS, and STZ plus LPS showed significant increases in edema and
vascular permeability (heart, kidney, lung, and liver) and increased expression
of B1R in heart and kidney (mRNA) and platelets (protein). Lethal septic shock
induced by LPS was enhanced in STZ-diabetic rats and was associated with lung and
kidney damage, including platelet micro-aggregate formation. SSR240612 prevented
all these abnormalities as well as STZ-induced hyperglycemia and LPS-induced
hyperthermia. Similarly to SSR240612, blockade of iNOS and COX-2 improved
survival. Data provide the first evidence that kinin B1R plays a primary role in
lethal thrombosis in a rat model of septic shock in diabetes. Pharmacological
rescue was made possible with B1R antagonism or by inhibition of iNOS and COX-2,
which may act as downstream mechanisms.