In-vitro and in-vivo antidiabetic activity of aerial parts of Aitchisonia rosea supported by phytochemical and GC-MS analysis

Medicinal plants contain a wide variety of bioactive phytoconstituents which can serve as new therapeutic agents for several diseases. This study examines the antidiabetic potential of Aitchisonia rosea in alloxan-induced diabetic rats and identifies its bioactive phytoconstituents using GC-MS. In vitro, antidiabetic potential was established using the α-amylase inhibition assay. In vivo, antidiabetic potential was investigated by employing the oral glucose tolerance test (OGTT). GC-MS analysis was used to identify the bioactive phytoconstituents. The in vitro and in vivo tests showed that the aqueous extract of A. rosea possesses better antidiabetic potential. The α-amylase inhibition assay highlighted an IC50 value of 134.87µg/ml. In an oral glucose tolerance test, rats given an aqueous A. rosea extract significantly lowered their blood sugar levels significant reduction in the blood glucose concentration was observed in the oral glucose tolerance test in rats treated with the aqueous A. rosea extract. GC-MS investigation revealed many phytoconstituents, with serverogenin acetate and cycloheptasiloxane tetradecamethyl being important antidiabetic agents. This study found anti-diabetic properties in A. rosea extract. The phytochemical and GC-MS investigation also found serverogenin acetate and cycloheptasiloxane tetradecamethyl, which could be used to develop new antidiabetic drugs.

γδ T Cells Promote Steatohepatitis by Orchestrating Innate and Adaptive Immune Programming

BACKGROUND AND AIMS

The recruitment and activation of inflammatory cells in the liver delineates the transition from hepatic steatosis to steatohepatitis (SH).

APPROACH AND RESULTS

We found that in SH, γδT cells are recruited to the liver by C-C chemokine receptor (CCR) 2, CCR5, and nucleotide-binding oligomerization domain-containing protein 2 signaling and are skewed toward an interleukin (IL)-17A⁺ phenotype in an inducible costimulator (ICOS)/ICOS ligand-dependent manner. γδT cells exhibit a distinct Vγ4⁺ , PD1⁺ , Ly6C⁺ CD44⁺ phenotype in SH. Moreover, γδT cells up-regulate both CD1d, which is necessary for lipid-based antigens presentation, and the free fatty acid receptor, CD36. γδT cells are stimulated to express IL-17A by palmitic acid and CD1d ligation. Deletion, depletion, and targeted interruption of γδT cell recruitment protects against diet-induced SH and accelerates disease resolution.

CONCLUSIONS

We demonstrate that hepatic γδT cells exacerbate SH, independent of IL-17 expression, by mitigating conventional CD4⁺ T-cell expansion and modulating their inflammatory program by CD1d-dependent vascular endothelial growth factor expression.

Targeting SYK signaling in myeloid cells protects against liver fibrosis and hepatocarcinogenesis

Liver fibrosis and fibrosis-associated hepatocarcinogenesis are driven by chronic inflammation and are leading causes of morbidity and death worldwide. SYK signaling regulates critical processes in innate and adaptive immunity, as well as parenchymal cells. We discovered high SYK expression in the parenchymal hepatocyte, hepatic stellate cell (HSC), and the inflammatory compartments in the fibrotic liver. We postulated that targeting SYK would mitigate hepatic fibrosis and oncogenic progression. We found that inhibition of SYK with the selective small molecule inhibitors Piceatannol and PRT062607 markedly protected against toxin-induced hepatic fibrosis, associated hepatocellular injury and intra-hepatic inflammation, and hepatocarcinogenesis. SYK inhibition resulted in increased intra-tumoral expression of the p16 and p53 but decreased expression of Bcl-xL and SMAD4. Further, hepatic expression of genes regulating angiogenesis, apoptosis, cell cycle regulation, and cellular senescence were affected by targeting SYK. We found that SYK inhibition mitigated both HSC trans-differentiation and acquisition of an inflammatory phenotype in T cells, B cells, and myeloid cells. However, in vivo experiments employing selective targeted deletion of SYK indicated that only SYK deletion in the myeloid compartment was sufficient to confer protection against fibrogenic progression. Targeting SYK promoted myeloid cell differentiation into hepato-protective TNFα^low CD206^hi phenotype downregulating mTOR, IL-8 signaling and oxidative phosphorylation. Collectively, these data suggest that SYK is an attractive target for experimental therapeutics in treating hepatic fibrosis and oncogenesis.

Pulmonary Tuberculosis After Gastric Bypass: A Very Rare Complication

Laparoscopic Roux-en-Y gastric bypass (RYGB) is the most commonly performed bariatric surgical procedure with successful outcomes. RYGB has multiple positive outcomes, including sustained weight reduction, resolution of co-morbidities and improvement in the overall health. RYGB has many complications like any other surgery, but the development of tuberculosis (TB) either pulmonary or extra-pulmonary secondary to RYGB is very rare. We present a 32-year-old female with the history of a successful RYGB three years ago, who presented with signs and symptoms of possible TB which was later confirmed with sputum acid-fast bacilli and sputum culture. She was treated with anti-tuberculosis treatment (ATT) drugs for six months with complete resolution of her symptoms. We recommend raising awareness in the health care professionals about this rare complication of RYGB in the need of time.

Outcome of Endoscopic Management of Post Living Donor Liver Transplant Anastomotic Strictures

OBJECTIVE

To evaluate the therapeutic efficacy of endoscopic dilatation of anastomotic stricture (AS).

STUDY DESIGN

An observational study.

PLACE AND DURATION OF STUDY

Department of Gastroenterology and Hepatology, Shaikh Zayed Hospital, Lahore, Pakistan from November 2016 to November 2017.

METHODOLOGY

Patients presenting with anastomotic biliary stricture following living donor liver transplant (LDLT) underwent endoscopic retrograde cholangio-pancreaticography (ERCP) and treatment of their strictures with dilatation with or without stenting. The patients were then followed up to see adequate resolution of stricture and repeat therapeutic ERCP was performed, if required. The patients were labelled as cured if stricture resolution persisted for a period of up to six months following ERCP.

RESULTS

Forty-three patients (32 males and 11 females), with post-LDLT AS, who met the inclusion and exclusion criteria were enrolled in the study. Thirty-six (83.7%) patients had a single biliary anastomosis while seven (16.3%) patients had two anastomoses. Ductoplasty was done in 15 (34.9%) of the enrolled patients. Patients with post-LDLT AS required 3.65 +1.15 sessions of ERCP. Plastic type biliary stent was used in seven (16.3%) patients, balloon dilatation alone was done in five (11.6%) patients and combined balloon dilatation and stent placement was performed in 29 (67.4%) patients, and combined graduated dilator and stent placement was performed in two (4.7%) patients. Five (11.6%) patients required rendezvous procedure (whereby a radiologist placed a guidewire percutaneously into the biliary system) as guidewire placement across stricture site was endoscopically unsuccessful. The overall success rate was 88.4%. Mean stent free follow-up was 7.18 +1.38 months. Recurrence of AS was noted in one (2.3%) patient.

CONCLUSION

Endoscopic management of post-LDLT AS has an efficacious long-term outcome.

A Rare Case of Raoultella planticola Urinary Tract Infection in a Patient With Immunoglobulin A Nephropathy

Raoultella planticola is a gram-negative, aerobic, nonmotile mostly found in environments with high prevalence in soil and water. This organism is a very rare human pathogen as only 29 cases of Raoultella planticola–related infections have been reported until 2017, with only 7 cases in the United States. Only 3 cases of urinary tract infection secondary to R planticola have been reported, 1 in a pediatric patient and 2 in adults. In this article, we present a case of R planticola urinary tract infection in a 65-year-old male with immunoglobulin A nephropathy. On investigation, the patient was found to be septic and empirical antibiotic was started for gram-negative coverage. The patient showed remarkable improvement and discharged on oral antibiotic for 7 days. R planticola rarely cause infection in humans, with overall good prognosis.