10 research outputs found
Elevated miR-33a and miR-224 in steatotic chronic hepatitis C liver biopsies.
AIM: To assess the expression of selected microRNAs (miRNA) in hepatitis C, steatotic hepatitis C, noninfected steatotic and normal liver tissues. METHODS: The relative expression levels of miR-21, miR-33a, miR-96, miR-122, miR-125b, miR-221 and miR-224 were determined in 76 RNA samples isolated from 18 non-steatotic and 28 steatotic chronic hepatitis C (CHC and CHC-Steatosis, respectively) cases, 18 non-infected, steatotic liver biopsies of metabolic origin (Steatosis) and 12 normal formalin-fixed paraffin-embedded liver tissues using TaqMan MicroRNA Assays. All CHC biopsy samples were obtained prior to initiating therapy. Patients' serum biochemical values, which included glucose, triglyceride, cholesterol, alanine aminotransferase (ALT), aspartate aminotransferase (AST), gamma-glutamyl-transferase (GGT), alkaline phosphatase (AP), were obtained and correlated with relative miRNA expression. RESULTS: When compared with control non-infected liver samples, miR-122 and miR-221 levels were reduced in CHC-Steatosis (P < 0.03) and in CHC, CHC-Steatosis and Steatosis (P < 0.01). Alternatively, the expression of miR-33a and miR-224 were elevated in CHC-Steatosis and Steatosis in comparison to control tissue (P < 0.01). The levels of miR-33a and miR-224 in CHC-Steatosis (P < 0.02) and miR-224 in Steatosis (P < 0.001) were increased in comparison to CHC samples. By contrast, the expression of miR-21 did not differ statistically between diseased and normal liver samples. Levels of miR-33a correlated negatively with serum AST and AP levels in Steatosis as well as with necroinflammatory grade in CHC, whereas miR-21 correlated positively with AST in Steatosis and displayed negative correlation with triglyceride level in CHC-Steatosis. In contrast, miRNA levels were not correlated with ALT, GGT, cholesterol levels or fibrosis stage. CONCLUSION: Differences in miRNA expression were observed between CHC and steatotic CHC, CHC and steatotic liver, but not between steatotic CHC and steatotic liver of metabolic origin
Elevated miR-33a and miR-224 in steatotic chronic hepatitis C liver biopsies
AIM: To assess the expression of selected microRNAs (miRNA) in hepatitis C, steatotic hepatitis C, noninfected steatotic and normal liver tissues. METHODS: The relative expression levels of miR-21, miR-33a, miR-96, miR-122, miR-125b, miR-221 and miR-224 were determined in 76 RNA samples isolated from 18 non-steatotic and 28 steatotic chronic hepatitis C (CHC and CHC-Steatosis, respectively) cases, 18 non-infected, steatotic liver biopsies of metabolic origin (Steatosis) and 12 normal formalin-fixed paraffin-embedded liver tissues using TaqMan MicroRNA Assays. All CHC biopsy samples were obtained prior to initiating therapy. Patients' serum biochemical values, which included glucose, triglyceride, cholesterol, alanine aminotransferase (ALT), aspartate aminotransferase (AST), gamma-glutamyl-transferase (GGT), alkaline phosphatase (AP), were obtained and correlated with relative miRNA expression. RESULTS: When compared with control non-infected liver samples, miR-122 and miR-221 levels were reduced in CHC-Steatosis (P < 0.03) and in CHC, CHC-Steatosis and Steatosis (P < 0.01). Alternatively, the expression of miR-33a and miR-224 were elevated in CHC-Steatosis and Steatosis in comparison to control tissue (P < 0.01). The levels of miR-33a and miR-224 in CHC-Steatosis (P < 0.02) and miR-224 in Steatosis (P < 0.001) were increased in comparison to CHC samples. By contrast, the expression of miR-21 did not differ statistically between diseased and normal liver samples. Levels of miR-33a correlated negatively with serum AST and AP levels in Steatosis as well as with necroinflammatory grade in CHC, whereas miR-21 correlated positively with AST in Steatosis and displayed negative correlation with triglyceride level in CHC-Steatosis. In contrast, miRNA levels were not correlated with ALT, GGT, cholesterol levels or fibrosis stage. CONCLUSION: Differences in miRNA expression were observed between CHC and steatotic CHC, CHC and steatotic liver, but not between steatotic CHC and steatotic liver of metabolic origin
Effect of melatonin on the severity of l-arginine-induced experimental acute pancreatitis in rats
AIM: To determine the effect of melatonin pre- and post-treatment on the severity
of L-arginine (L-Arg) -induced experimental pancreatitis in rats. METHODS: Male
Wistar rats (25) were divided into five groups. Those in group A received two
injections of 3.2g/kg body weight L-Arg i.p. at an interval of 1h. In group MA,
the rats were treated with 50 mg/kg body weight melatonin i.p. 30 min prior to
L-Arg administration. In group AM, the rats received the same dose of melatonin
1h after L-Arg was given. In group M, a single dose of melatonin was administered
as described previously. In group C the control animals received physiological
saline injections i.p. All rats were exsanguinated 24 h after the second L-Arg
injection. RESULTS: L-Arg administration caused severe necrotizing pancreatitis
confirmed by the significant elevations in the serum amylase level, the
pancreatic weight/body weight ratio (pw/bw), the pancreatic IL-6 content and the
myeloperoxidase activity, relative to the control values. Elevation of the serum
amylase level was significantly reduced in rats given melatonin following L-Arg
compared to rats injected with L-Arg only. The activities of the pancreatic
antioxidant enzymes (Cu/Zn-superoxide dismutase (Cu/Zn-SOD) and catalase (CAT))
were significantly increased 24 h after pancreatitis induction. Melatonin given
in advance of L-Arg significantly reduced the pancreatic CAT activity relative to
that in the rats treated with L-Arg alone. In the liver, L-Arg significantly
increased the lipid peroxidation level, and the glutathione peroxidase and
Cu/Zn-SOD activities, whereas the Mn-SOD activity was reduced as compared to the
control rats. Melatonin pre-treatment prevented these changes. CONCLUSION:
Melatonin is an antioxidant that is able to counteract some of the L-Arg-induced
changes during acute pancreatitis, and may therefore be helpful in the supportive
therapy of patients with acute necrotizing pancreatitis
A nuclear import inhibitory peptide ameliorates the severity of cholecystokinin-induced acute pancreatitis
AIM: To assess the effect of our novel cell-permeable nuclear factor-kappaB
(NF-kappaB) inhibitor peptide PN50 in an experimental model of acute
pancreatitis. PN50 was produced by conjugating the cell-penetrating penetratin
peptide with the nuclear localization signal of the NF-kappaB p50 subunit.
METHODS: Pancreatitis was induced in male Wistar rats by administering 2X100
mug/kg body weight of cholecystokinin-octapeptide (CCK) intraperitoneally (IP) at
an interval of 1 h. PN50-treated animals received 1 mg/kg of PN50 IP 30 min
before or after the CCK injections. The animals were sacrificed 4 h after the
first injection of CCK. RESULTS: All the examined laboratory (the pancreatic
weight/body weight ratio, serum amylase activity, pancreatic levels of TNF-alpha
and IL-6, degree of lipid peroxidation, reduced glutathione levels, NF-kappaB
binding activity, pancreatic and lung myeloperoxidase activity) and morphological
parameters of the disease were improved before and after treatment with the PN50
peptide. According to the histological findings, PN50 protected the animals
against acute pancreatitis by favoring the induction of apoptotic, as opposed to
necrotic acinar cell death associated with severe acute pancreatitis. CONCLUSION:
Our study implies that reversible inhibitors of stress-responsive transcription
factors like NF-kappaB might be clinically useful for the suppression of the
severity of acute pancreatitis
Importance of cytokines, nitric oxide, and apoptosis in the pathological process of necrotizing pancreatitis in rats
The proteasome inhibitor mg132 protects against acute pancreatitis
The cell-permeant MG132 tripeptide (Z-Leu-Leu-Leu-aldehyde) is a peptide aldehyde
proteasome inhibitor that also inhibits other proteases, including calpains and
cathepsins. By blocking the proteasome, this tripeptide has been shown to induce
the expression of cell-protective heat shock proteins (HSPs) in vitro. Effects of
MG132 were studied in an in vivo model of acute pancreatitis. Pancreatitis was
induced in male Wistar rats by injecting 2 x 100 microug/kg cholecystokinin
octapeptide intraperitoneally (ip) at an interval of 1 h. Pretreating the animals
with 10 mg/kg MG132 ip before the induction of pancreatitis significantly
inhibited IkappaB degradation and subsequent activation of nuclear factor-kappaB
(NF-kappaB). MG132 also increased HSP72 expression. Induction of HSP72 and
inhibition of NF-kappaB improved parameters of acute pancreatitis. Thus MG132
significantly decreased serum amylase, pancreatic weight/body weight ratio,
pancreatic myeloperoxidase activity, proinflammatory cytokine concentrations, and
the expression of pancreatitis-associated protein. Parameters of oxidative stress
(GSH, MDA, SOD, etc.) were improved in both the serum and the pancreas.
Histopathological examinations revealed that pancreatic specimens of animals
pretreated with the peptide demonstrated milder edema, cellular damage, and
inflammatory activity. Our findings show that simultaneous inhibition of
calpains, cathepsins, and the proteasome with MG132 prevents the onset of acute
pancreatitis