Chatterjee SS

References (8)

Title : Beneficial effects of an Andrographis paniculata extract and andrographolide on cognitive functions in streptozotocin-induced diabetic rats - Thakur_2016_Pharm.Biol__1
Author(s) : Thakur AK , Rai G , Chatterjee SS , Kumar V
Ref : Pharm Biol , :1 , 2016
Abstract : Context Andrographolide containing Andrographis paniculata (Burm. F.) Wall. Ex Nees (Acanthaceae) extracts is often used for treatments of diabetes and other inflammatory disorders commonly accompanying cognitive and other psychiatric disorders. Objective To compare the efficacies of a standardised A. paniculata extract (AP) and pure andrographolide on cognitive functions, oxidative stress and cholinergic function in diabetic rats. Materials and methods Streptozotocin-induced diabetic Charles Foster albino rats treated orally with a hydro-methanolic A. paniculata leaf extract (50, 100 and 200 mg/kg/day), or with pure andrographolide (15, 30 and 60 mg/kg/day) for 10 consecutive days, were subjected to Morris water maze test. After the test, acetylcholinesterase, superoxide dismutase (SOD), and catalase (CAT) activities and lipid peroxidation (LPO) in brain tissues were assessed. Results Acetylcholinesterase activity in pre-frontal cortex and hippocampus of diabetic rats was 2.1 and 2.6 times higher compared to nondiabetic rats. LPO was 1.6 times higher and decreased SOD (56.3%) and CAT (44.9%) activities in pre-frontal cortex of diabetic rats compared to nondiabetic rats. AP or andrographolide treatments dose dependently attenuated cognitive deficits, reduced acetylcholinesterase activity, oxidative stress, improved diabetic hyperglycemia and insulin deficiency. All observed effects of AP were quantitatively almost equal to those expected from its analytically quantified andrographolide content. Discussion and conclusion Reported observations are the very first ones suggesting beneficial effects of andrographolide against diabetes associated cognitive deficits, increased acetylcholinesterase activity and deteriorated antioxidative status. Efforts to exploit A. paniculata extracts enriched in andrographolide as preventive measures against such disorders can be warranted.
ESTHER : Thakur_2016_Pharm.Biol__1
PubMedSearch : Thakur_2016_Pharm.Biol__1
PubMedID: 26810454

Title : Beneficial effects of Brassica juncea on cognitive functions in rats - Thakur_2013_Pharm.Biol_51_1304
Author(s) : Thakur AK , Chatterjee SS , Kumar V
Ref : Pharm Biol , 51 :1304 , 2013
Abstract : Abstract Context. Brassica juncea (BJ; Linnaeus) Czern & Coss (Brassicaceae), commonly known as Indian mustard, are enriched in redox-active polyphenols with antidiabetic activities. Diverse other health benefits of this edible plant have been described in classical Ayurvedic texts. Objective: The reported experiments were designed to assess therapeutic potential of a methanol extract of BJ leaves for treatment of cognitive disorders associated with diabetes or caused by central cholinergic dysfunctions. Materials and methods: Elevated plus-maze and active- and passive-avoidance tests were used to assess anti-amnesic potentials of BJ (100, 200 and 400 mg/kg/day, p.o., for 10 days) in alloxan diabetic or scopolamine-challenged rats. Treatment effects on brain acetylcholinesterase (AChE), superoxide dismutase (SOD) and catalase (CAT) activities were quantified in behavioral tested animals. Results: Anti-amnesic efficacy of all three tested BJ doses against scopolamine-induced amnesia was almost equal in all behavioral tests. Such efficacy of the extract in diabetic rats was increased always with its increasing doses. All treatments of BJ dose dependently decreased the elevated level of AChE, and significantly increased the SOD and CAT levels in brain homogenates of scopolamine-challenged and diabetic rats. Minimal effective oral daily doses of BJ in all tests were 100 mg/kg/day for 10 consecutive days. Discussion and conclusion: Our observation indicates that BJ could be a therapeutic option for treatment of cognitive disorders associated with diabetes, or caused by cholinergic deficit and brain oxidative status. They also indicate that the bioactive constituents or mode of actions involved in observed effects of the extract in scopolamine-challenged or diabetic rats are most probably not the same.
ESTHER : Thakur_2013_Pharm.Biol_51_1304
PubMedSearch : Thakur_2013_Pharm.Biol_51_1304
PubMedID: 23848339

Title : Complete genome sequence of a Panton-Valentine leukocidin-negative community-associated methicillin-resistant Staphylococcus aureus strain of sequence type 72 from Korea - Chen_2013_PLoS.One_8_e72803
Author(s) : Chen Y , Chatterjee SS , Porcella SF , Yu YS , Otto M
Ref : PLoS ONE , 8 :e72803 , 2013
Abstract : In the past decade, community-associated (CA-) infections with methicillin-resistant Staphylococcus aureus (MRSA) have emerged throughout the world. Different CA-MRSA strains dominate in different geographical locations. Many CA-MRSA lineages contain genes coding for the Panton-Valentine leukocidin. However, the role of this leukotoxin in CA-MRSA pathogenesis is still controversial. The genome sequences of two key PVL-positive CA-MRSA strains (USA300, USA400) have been reported, but we lack information on the more recently found PVL-negative CA-MRSA strains. One such strain is the PVL-negative ST72, the main cause of CA-MRSA infections in Korea. Here, we report the entire genome sequence of CA-MRSA ST72 and analyze its gene content with a focus on virulence factors. Our results show that this strain does not have considerable differences in virulence factor content compared to other CA-MRSA strains (USA300, USA400), indicating that other toxins do not substitute for the lack of PVL in ST72. This finding is in accordance with the notion that differential expression of widespread virulence determinants, rather than the acquisition of additional virulence factors on mobile genetic elements, such as PVL, is responsible for the increased virulence of CA- compared to hospital-associated MRSA.
ESTHER : Chen_2013_PLoS.One_8_e72803
PubMedSearch : Chen_2013_PLoS.One_8_e72803
PubMedID: 23977354
Gene_locus related to this paper: staau-SA2240

Title : Effects of ethanolic extract of Fumaria indica L. on rat cognitive dysfunctions - Singh_2013_Ayu_34_421
Author(s) : Singh GK , Rai G , Chatterjee SS , Kumar V
Ref : Ayu , 34 :421 , 2013
Abstract : Fumaria indica L. in Ayurveda is known as Parpat and traditionally used to calm the brain. Due to lack of scientific validation, 50% ethanolic extract of F. indica L. (FI) was evaluated for putative cognitive function modulating effects. Suspension of FI in 0.3% carboxymethyl cellulose (CMC) was orally administered to rats during the entire experimental period of 16 days at dose levels of 100, 200, and 400 mg/kg/day. Piracetam was used as standard nootropic. Behavioral models of learning and memory used were modified elevated plus-maze (M-EPM) and passive avoidance (PA) tests. Scopolamine (I mg/kg, s.c.), sodium nitrite (25 mg/kg, i.p.), and electroconvulsive shock (150 mA, 0.2 sec) were used to induce amnesia. Acetylcholinesterase (AChE) activity, muscarinic receptor density, oxidative status, and cytokine expressions [tumor necrosis factor alpha (TNF-alpha), interleukin (IL)-1beta, and IL-10] were also assessed. Piracetam (500 mg/kg/day)-like memory-enhancing and anti-amnesic activity of the extract was observed. FI showed dose-dependent decrease in brain AChE activity and increase in muscarinic receptor density, and such was also the case for its observed beneficial effects on the brain antioxidative status. FI also inhibited the scopolamine-induced overexpression of the three tested cytokines observed in rat's brain. FI possesses nootropic-like beneficial effects on cognitive functions.
ESTHER : Singh_2013_Ayu_34_421
PubMedSearch : Singh_2013_Ayu_34_421
PubMedID: 24696581

Title : Whole-genome sequence of Listeria welshimeri reveals common steps in genome reduction with Listeria innocua as compared to Listeria monocytogenes - Hain_2006_J.Bacteriol_188_7405
Author(s) : Hain T , Steinweg C , Kuenne CT , Billion A , Ghai R , Chatterjee SS , Domann E , Karst U , Goesmann A , Bekel T , Bartels D , Kaiser O , Meyer F , Puhler A , Weisshaar B , Wehland J , Liang C , Dandekar T , Lampidis R , Kreft J , Goebel W , Chakraborty T
Ref : Journal of Bacteriology , 188 :7405 , 2006
Abstract : We present the complete genome sequence of Listeria welshimeri, a nonpathogenic member of the genus Listeria. Listeria welshimeri harbors a circular chromosome of 2,814,130 bp with 2,780 open reading frames. Comparative genomic analysis of chromosomal regions between L. welshimeri, Listeria innocua, and Listeria monocytogenes shows strong overall conservation of synteny, with the exception of the translocation of an F(o)F(1) ATP synthase. The smaller size of the L. welshimeri genome is the result of deletions in all of the genes involved in virulence and of "fitness" genes required for intracellular survival, transcription factors, and LPXTG- and LRR-containing proteins as well as 55 genes involved in carbohydrate transport and metabolism. In total, 482 genes are absent from L. welshimeri relative to L. monocytogenes. Of these, 249 deletions are commonly absent in both L. welshimeri and L. innocua, suggesting similar genome evolutionary paths from an ancestor. We also identified 311 genes specific to L. welshimeri that are absent in the other two species, indicating gene expansion in L. welshimeri, including horizontal gene transfer. The species L. welshimeri appears to have been derived from early evolutionary events and an ancestor more compact than L. monocytogenes that led to the emergence of nonpathogenic Listeria spp.
ESTHER : Hain_2006_J.Bacteriol_188_7405
PubMedSearch : Hain_2006_J.Bacteriol_188_7405
PubMedID: 16936040
Gene_locus related to this paper: lisin-LIN0976 , lisin-LIN2544 , lismo-LMO2089 , lismo-LMO2452 , lismo-LMO2453 , lismo-metx , lisss-d3urb3 , lisw6-a0agy6 , lisw6-a0ajc8 , lisw6-a0am12

Title : KA-672 inhibits rat brain acetylcholinesterase in vitro but not in vivo - Hilgert_1999_Neurosci.Lett_263_193
Author(s) : Hilgert M , Noldner M , Chatterjee SS , Klein J
Ref : Neuroscience Letters , 263 :193 , 1999
Abstract : KA-672, a lipophilic benzopyranone derivative which is currently under development as a cognitive enhancer and antidementia drug, has previously been shown to have facilitatory effects on learning and memory in rats at doses of 0.1-1 mg/kg. We now report that KA-672 inhibited the activity of acetylcholinesterase (AChE), measured in vitro in rat brain cortical homogenate, with an IC50 value of 0.36 microM indicating that KA-672 may improve cognitive functions as a consequence of AChE inhibition. However, when we employed the microdialysis procedure to monitor acetylcholine (ACh) release from rat hippocampus, no effect of KA-672 (0.1-10 mg/kg) was found, indicating a lack of inhibition of brain AChE under in vivo-conditions. [14C]-labelled KA-672 was found to easily penetrate the blood-brain barrier, and an apparent concentration of 0.22 nmol/g brain (equivalent to 0.39 microM tissue concentration) was calculated following an i.p. injection of 1 mg/kg KA-672. However, no labelled substance could be detected in hippocampal microdialysates or in cerebrospinal fluid (CSF) taken from the cisterna magna, indicating that the concentration of KA-672 in brain extracellular fluid must have been below 0.01 microM. We conclude that KA-672 is a potent AChE inhibitor, an activity which, however, does not contribute to its behavioural effects in vivo because the lipophilic drug does not reach sufficient concentrations in the extracellular fluid, apparently due to cellular sequestration.
ESTHER : Hilgert_1999_Neurosci.Lett_263_193
PubMedSearch : Hilgert_1999_Neurosci.Lett_263_193
PubMedID: 10213168

Title : Phospholipid breakdown and choline release under hypoxic conditions: inhibition by bilobalide, a constituent of Ginkgo biloba - Klein_1997_Brain.Res_755_347
Author(s) : Klein J , Chatterjee SS , Loffelholz K
Ref : Brain Research , 755 :347 , 1997
Abstract : A marked increase of choline release from rat hippocampal slices was observed when the slices were superfused with oxygen-free buffer, indicating hypoxia-induced hydrolysis of choline-containing phospholipids. This increase of choline release was suppressed by bilobalide, an ingredient of Ginkgo biloba, but not by a mixture of ginkgolides. The EC50 value for bilobalide was 0.38 microM. In ex vivo experiments, bilobalide also inhibited hypoxia-induced choline release when given p.o. in doses of 2-20 mg/kg 1 h prior to slice preparation. The half-maximum effect was observed with 6 mg/kg bilobalide. A similar effect was noted after p.o. administration of 200 mg/kg EGb 761, a ginkgo extract containing approximately 3% of bilobalide. We conclude that ginkgo extracts can suppress hypoxia-induced membrane breakdown in the brain, and that bilobalide is the active constituent for this effect.
ESTHER : Klein_1997_Brain.Res_755_347
PubMedSearch : Klein_1997_Brain.Res_755_347
PubMedID: 9175905

Title : An aggregate brain cell culture model for studying neuronal degeneration and regeneration - Chatterjee_1994_J.Neural.Transm.Suppl_44_47
Author(s) : Chatterjee SS , Noldner M
Ref : J Neural Transm Suppl , 44 :47 , 1994
Abstract : Rotation-mediated aggregating cell cultures from fetal rat telencephalons containing glial and neuronal cells mature in a fashion comparable to that known to occur in brain in vivo. Large aggregates of 300-500 microM diameters can now reproducibly be cultivated and maintained for more than 40 days in a well defined serum free medium. Validity of the use of such cultures for in vitro studies of various physiological, pharmacological and toxicological phenomenon has already been demonstrated. In this communication some observations suggesting the usefulness of such cultures for pharmacological studies clarifying the possible effects of drugs and other agents on excitatory amino acid induced pathological processes will be presented. The advantages and limitations of the use of aggregated brain cell culture based models for the development of agents potentially useful for the treatment of aging and dementia will also be discussed.
ESTHER : Chatterjee_1994_J.Neural.Transm.Suppl_44_47
PubMedSearch : Chatterjee_1994_J.Neural.Transm.Suppl_44_47
PubMedID: 7897399