In vivo anti-tussive activity and structural features of a polysaccharide fraction from water extracted Withania somnifera

Aim of the study

Anti-tussive drugs are amongst the most widely used medications worldwide; however no new class of drugs has been introduced into the market for many years. The present study aims at evaluating the structural features and in vivo anti-tussive activity of a polysaccharide fraction from water extracted Withania somnifera.

Materials and methods

Herein, we have analyzed water extracted material of Withania somnifera using chemical, chromatographic, spectroscopic and biological methods.

Results

A polysaccharide fraction (F3) containing arabinosyl, galactosyl and galacturonosyl residues were obtained by anion exchange chromatography of the water extracted material. This polymer is branched and contained (1,5)-/(1,3,5)-linked arabinofuranosyl, (1,3)-/(1,6)-/(1,3,6)-linked galactopyranosyl residues together with small amount of terminal rhamnopyranosyl and terminal arabinofuranosyl residues. Peroral administration of this pectic arabinogalactan in a dose of 50 mg kg⁻¹ body weight (b.w.) decreased the number of cough efforts induced by citric acid in guinea pigs like that of codeine.

Conclusions

This study provides a scientific basis for the past and present ethnomedical uses of this plant.     

Perils and possibilities: achieving best evidence from focus groups in public health research

Objective: Focus group research is often seen as a cost-effective way of gathering evidence from multiple research participants about the diversity of their views, experiences or beliefs. Our objective is to argue that focus group research only fulfils its potential if analysis of individual views is extended to include analysis of interaction between participants, so that we learn more why people hold these views.
Approach: We outline the literature on focus group research, contrasting the 'quick-and-easy' approach with the demands of studies that are designed, conducted and analysed in a methodologically rigorous way to yield high quality public health evidence.
Conclusion: Well-conducted focus groups contribute good evidence for public health decision making. The challenges of conducting high-quality studies should not be underestimated, and must involve rigorous analysis of both interaction and content.     

Novel antimalarial drug targets: hope for new antimalarial drugs

Malaria is a major global threat, that results in more than 2 million deaths each year. The treatment of malaria is becoming extremely difficult due to the emergence of drug-resistant parasites, the absence of an effective vaccine, and the spread of insecticide-resistant vectors. Thus, malarial therapy needs new chemotherapeutic approaches leading to the search for new drug targets. Here, we discuss different approaches to identifying novel antimalarial drug targets. We have also given due attention to the existing validated targets with a view to develop novel, rationally designed lead molecules. Some of the important parasite proteins are claimed to be the targets; however, further in vitro or in vivo structure-function studies of such proteins are crucial to validate these proteins as suitable targets. The interactome analysis among apicoplast, mitochondrion and genomic DNA will also be useful in identifying vital pathways or proteins regulating critical pathways for parasite growth and survival, and could be attractive targets. Molecules responsible for parasite invasion to host erythrocytes and ion channels of infected erythrocytes, essential for intra-erythrocyte survival and stage progression of parasites are also becoming attractive targets. This review will discuss and highlight the current understanding regarding the potential antimalarial drug targets, which could be utilized to develop novel antimalarials.     

Headache in a case of Rhupus syndrome

We report a case of Rhupus with secondary anti-phospholipid syndrome who presented with headache and papilloedema due to cerebral venous thrombosis. We propose that an increased awareness about the condition and meticulous investigation of headaches in lupus can avert catastrophic outcomes.     

Antiplasmodial activity of [(aryl)arylsulfanylmethyl]Pyridine

A series of [(aryl)arylsufanylmethyl]pyridines (AASMP) have been synthesized. These compounds inhibited hemozoin formation, formed complexes (K(D) = 12 to 20 muM) with free heme (ferriprotoporphyrin IX) at a pH close to the pH of the parasite food vacuole, and exhibited antimalarial activity in vitro. The inhibition of hemozoin formation may develop oxidative stress in Plasmodium falciparum due to the accumulation of free heme. Interestingly, AASMP developed oxidative stress in the parasite, as evident from the decreased level of glutathione and increased formation of lipid peroxide, H(2)O(2), and hydroxyl radical (.OH) in P. falciparum. AASMP also caused mitochondrial dysfunction by decreasing mitochondrial potential (DeltaPsim) in malaria parasite, as measured by both flow cytometry and fluorescence microscopy. Furthermore, the generation of .OH may be mainly responsible for the antimalarial effect of AASMP since .OH scavengers such as mannitol, as well as spin trap alpha-phenyl-n-tertbutylnitrone, significantly protected P. falciparum from AASMP-mediated growth inhibition. Cytotoxicity testing of the active compounds showed selective activity against malaria parasite with selectivity indices greater than 100. AASMP also exhibited profound antimalarial activity in vivo against chloroquine resistant P. yoelii. Thus, AASMP represents a novel class of antimalarial.     

ANCA-negative limited Wegener's granulomatosis

A 26-year-old man presented with epistaxis, nasal obstruction and a subcutaneous swelling over the left malar region with radiological evidence of a mass in the right nasal cavity. Histology of the lesions showed necrotizing granuloma with evidence of vasculitis. There was no other systemic involvement and the patient was ANCA-negative. Excellent response to systemic steroid and cyclophosphamide therapy was noted.     

Antioxidant effect of Cytisus scoparius against carbon tetrachloride treated liver injury in rats

The study was aimed to investigate the antioxidant activity of Cytisus scoparius L. (Family: Leguminosae) on CCl(4) (carbon tetrachloride) treated oxidative stress in Wistar albino rats. CCl(4) injection induced oxidative stress by a significant rise in serum glutamate oxaloacetate transaminases (SGOT), serum glutamate pyruvate transaminases (SGPT), lactate dehydrogenase (LDH) and thiobarbituric acid reactive substances (TBARS) along with reduction of superoxide dismutase (SOD), catalase (CAT), reduced glutathione (GSH), glutathione peroxidase (GPx), glutathione-s-transferase (GST) and glutathione reductase (GRD). Pretreatment of rats with different doses of plant extract (250 and 500mg/kg) significantly lowered SGOT, SGPT, LDH and TBARS levels against CCl(4) treated rats. GSH and hepatic enzymes like SOD, CAT, GPx, GRD, and GST were significantly increased by treatment with the plant extract, against CCl(4) treated rats. The activity of extract at the dose of 500mg/kg was comparable to the standard drug, silymarin (25mg/kg). Based on these results, it was observed that Cytisus scoparius extract protects liver from oxidative stress induced by CCl(4) in rats and thus helps in evaluation of the traditional claim on this plant.     

Foreign bodies in the larynx

Inhalation of foreign body is a serious event. A very small proportion of foreign bodies get impacted in the larnyx. Any [foreign body in the larynx presents usually as a respiratory (emergency, when urgent recognition is required to prevent disaster. Two cases of fish bone impacted in the larynx, one in anteroposterior and another in coronal disposition are presented here along with a brief review of literature.     

Role of exfoliative cytology in diagnosis of malignancies of pharynx and larynx

Exfoliative cytology of forty cases of carcinoma pharynx and larynx was studied and compared with histopathological examination report. Exfoliative cytology established the diagnosis in 82.5% of the cases; which shows that it can be used as an adjunct in the diagnosis of carcinoma of pharynx and larynx.