Browsing by Author "Das, K K"

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    Biosynthesis of tumour-related glycosphingolipids.
    (1988-02-01) Basu, M; Das, K K; Zhang, B; Khan, F A; Basu, S
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    Carbohydrate and hydrophobic-carbohydrate recognition sites (CARS and HY-CARS) in solubilized glycosyltransferases.
    (1990-12-01) Basu, S; Ghosh, S; Basu, M; Hawes, J W; Das, K K; Zhang, B J; Li, Z X; Weng, S A; Westervelt, C
    Six different glycosyltransferases that are active with glycosphingolipid substrates have been purified from Golgi-membranes after solubilization with detergents. It appears that GalT-4(UDP-Gal:GlcNAc-R1 beta 1-4GalT), GalNAcT-2(UDP-Gal:Gal alpha-R2 beta 1-3GalNAcT) and FucT-2(GDP-Fuc:Gal beta GlcNAc-R3 alpha 1-2FucT) are specific for oligosaccharides bound to ceramide or to a protein moiety. These are called CARS (carbohydrate recognition sites) glycosyltransferases (GLTs). On the other hand, GalT-3(UDP-Gal:GM2 beta 1-3GalT), GalNAcT-1(UDP-GalNAc:GM3 beta 1-4GalNAcT) and FucT-3 (GDP-Fuc:LM1 alpha 1-3FucT) recognize both hydrophobic moieties (fatty acid of ceramide) as well as the oligosaccharide chains of the substrates. These GLTs are called HY-CARS (hydrophobic and carbohydrate recognition sites). D-Erythro-sphingosine (100-500 microM) modulates the in vitro activities of these GLTs. Modulation depends on the binding of D-sphingosine to a protein backbone, perhaps on more than one site and beyond transmembrane hydrophobic domains. Control of GLTs by free D-sphingosine was suggested with the concomitant discovery of ceramide glycanase in rabbit mammary tissues. The role of free sphingosine as an in vivo homotropic modulator of glycosyltransferases is becoming apparent.
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    Characteristics of patients admitted with stroke.
    (2007-01-09) Mollah, A S; Rahman, S W; Das, K K; Hassanuzzaman, M
    Population based study on stroke morbidity and mortality is lacking in our country. We described the clinical pattern of patients with stroke admitted in Neuromedicine Unit, Chittagong Medical College Hospital, Bangladesh. One hundred and six consecutive patients were included in the study. Clinical diagnosis of stroke, initial assessment, and assessment of outcome of stroke were performed by the neurologists. On admission blood glucose, and creatinine level was estimated, and an electrocardiogram was recorded. Fasting lipid level estimation and CT-scan of brain were performed for patients who could afford the cost. The mean age of the patients was 60.0 +/-13.7 years and the highest occurrence of stroke was found in the age group of 61 - 70 years. The proportions of rural, semiurban and urban patients were 46.2%, 27.4% and 26.4% respectively. A large portion of the patients were found illiterate (47.2%), and only one patient had postgraduate education. The average per capita income was found 1159 +/-762 taka per month. About one-fourth of the patients had diabetes (21.7%). Hypertension, ischemic heart disease and dyslipidemia were found in 59.4%, 18.9% and 11.3% respectively. The cause of hospitalization was altered consciousness (58.5%), right hemiplegia (32.1%), and left hemiplegia (31.1%) either alone or in combination. The mean duration of hospital stay was 5.25 +/-2.19 days. Fifty percent partially and 35% satisfactorily recovered, and 7 (6.6%) patients expired. Patients from lower socioeconomic group were admitted in the hospital. A considerable number of stroke patients had hypertension and diabetes.
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    Characterization of solubilized GlcAT-1 (UDP-GlcA: nLcOse4Cer beta 1-3 glucuronyltransferase) activity from embryonic chicken brain and its inhibition by D-erythro-sphingosine.
    (1990-12-01) Das, K K; Basu, M; Li, Z X; Basu, S; Jungalwala, F
    Glycolipid glucuronyltransferase activity (GlcAT-1) has been solubilized and characterized from 19-day-old embryonic chicken brain Golgi-rich membranes. The enzyme catalyzes the biosynthesis in vitro of GlcA beta 1-3nLcOse4Cer glycolipid using neolactetraosylceramide (nLcOse4Cer, Gal beta 1-4GlcNAc beta 1-3Gal beta-1-4Glc-Cer) as the substrate. The membrane-bound enzyme shows optimum activity in the presence of neutral detergents such as Triton CF-54, Triton DF-12, and Nonidet P-40. Approximately 60% of the enzyme activity can be solubilized from the Golgi membrane by Nonidet P-40. The solubilized GlcAT-1 activity is inhibited by different salts such as NaCl, NaBr, NaI, and NaOAc, but not by sodium fluoride (up to 0.4 M concentration). Desialyzed alpha 1 acid glycoprotein (SA alpha 1AGP) can be used as a substrate for glucuronyltransferase. Competition studies between glycolipid (nLcOse4Cer) and glycoprotein SA alpha 1AGP) substrates show a mixed type of inhibition. Phospholipids, in particular phosphatidylglycerol, stimulate solubilized GlcAT-1 activity, while D-erythro-sphingosine, a metabolite of glycosphingolipids, is inhibitory (50% inhibition at 0.8 mM D-erythro-sph). These results demonstrate that both phospholipid as well as sphingosine might be involved in modulating glucuronyltransferase activity.
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    Disability pattern amongst leprosy cases in an urban area (Calcutta).
    (1993-07-01) Saha, S P; Das, K K
    In a retrospective study of 1,264 leprosy cases, registered during 1987-1992, 282 were found to have disabilities giving a disability rate (DR) 22.31% and 150 of them were also found to have deformities, giving a deformity rate 11.9%. Mean disability index (DI) was found to be 1.17. Disability rate (DR) significantly increased with age and the highest rate was 52.75% in lepromatous (L) cases, followed by 27.51% in borderline (N?L) and only 4.53% in nonlepromatous (N) cases. L cases had the highest deformity rate (22.25%) and N cases had the lowest DR (2.23%). DI was highest (1.46) in L, and lowest (0.52) in N cases. Males had significantly higher DR (27.2%) compared to females (13.0%). Deformity in hands (42.55%) was more common than in feet (22.70%). Increasing trend of DI was noticed with increasing duration of disease in L and N?L types. The number of nerves involved was high (4.72) in L cases compared to other types. DI was highest (1.25) in patients engaged in occupations involving hard work.
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    (Dr. P. C. Sen Award on rural health practice). Infant and early childhood mortality in some rural ICDS blocks of west Bengal.
    (1993-07-01) Biswas, A B; Basu, M; Das, K K; Biswas, R
    This one year prospective study was carried out to determine the CBR, CDR and different underfive mortality rates in some selected rural ICDS blocks of West Bengal and also to find out the common causes of infant and childhood mortality in these areas. It was revealed that most of the above mentioned indicators in ICDS blocks were considerably lower than that of National figures, but more or less similar to those of rural Bengal as recorded in routine Govt. reports. Compared to the picture of rural West Bengal, both still birth & perinatal mortality rates were found higher in all ICDS blocks. The causes of mortality trends among under fives' were found similar to that of rural India pattern i.e. prematurity, acute respiratory infections and diarrhoea being the leaders. Neonates, who contributed the largest share of infant mortality died mainly due to prematurity. So, observations like high perinatal mortality & still birth rates, huge proportion of neonatal death during infancy, same IMR but low 5MR, and death of neonates due to prematurity etc. claim the necessity of improving maternal component of ICDS services, their nutritional care in particular.
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    Effect of a fatty acid moiety of phospholipid and ceramide on purified GalT-3 (UDP-Gal:GM2 beta 1-3 galactosyltransferase) activity from embryonic chicken brain.
    (1990-12-01) Ghosh, S; Das, K K; Daussin, F; Basu, S
    Galactosyltransferase, GalT-3 (UDP-Gal:GM2 beta 1-3 galactosyltransferase) has been characterized and solubilized from 19-day-old embryonic chicken brain, and purified to over 2000-fold using mixed-modal chromatography on a omega-aminohexyl Sepharose column and affinity chromatography on a UDP-hexanolamine Sepharose column. The activity of purified GalT-3 was modulated by phospholipids in vitro with stimulation observed specifically with dipalmitoyl phosphatidylethanolamine (PE). All natural phospholipids tested (PE, PC and PI) inhibited GalT-3 activity. Enzyme activity was affected by the structure of the phospholipid vesicle. It was stabilized by the hexagonal (dipalmitoyl PE) structure and inhibited by the bilayer (dielaidoyl PE) structure. The long-chain fatty acid moiety of the glycosphingolipid substrate, GM2, was found to be necessary for optimum enzyme activity. In the absence of fatty acid, the modified substrates, lyso-GM2 and acetyl-GM2, had a 10-fold increased Km and a 4-8 fold decreased Vmax compared to the normal substrate. We postulate that GalT-3 belongs to a group of glycosyltransferases having recognition for both the carbohydrate as well as the hydrophobic domains (HY-CARS) of their substrates and that the fatty acid moiety of either the substrate (GM2) or a heterotropic effector (phospholipid) plays an important role in regulating the activity of this enzyme.
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    Effects of rehousing of slum dwellers on the morbidity experience of pre-school children.
    (1976-04-01) Sen, A K; Das, K K; Mukherjee, P K; Chowdhury, A
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    Efficacy of methotrexate in rheumatoid arthritis.
    (1997-12-11) Ali, M L; Alam, M N; Haq, S A; Das, K K; Baral, P K
    Rheumatoid arthritis is a common inflammatory articular disorder in Bangladesh. Methotrexate has proved to be an effective and relatively safe disease modifying drug for this disease. A quasiexperimental trial of the efficacy of methotrexate in rheumatoid arthritis was carried out in the Rheumatology Clinic, Institute of Postgraduate Medicine & Research, Dhaka during the period between July 1992 and September 1993. Thirty eight patients fulfilling the revised ARA criteria were given methotrexate in a total weekly dose of 7.5 to 15 mg. They were followed up at weekly intervals for one month and then monthly for a total duration of six months. Twenty three subjects eventually completed the trial. The trial showed significant differences in the disease activity indices at the end of six months. The decline of activity was noted at the end of one month. As a whole the response was complete in 4(17%), marked in 14(61%), moderate in 4(17%) and nil in 1(4%). Adverse effects occurred in 27 subjects. They were mild and transient in 22. Methotrexate appeared to be an acceptable DMARD for our rheumatoid arthritis population.
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    Evaluation of the immunofluorescent test in typhoid.
    (1972-07-01) Das, K K; Sant, M V
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    Immunization of children.
    (1985-07-01) Mukhopdhyaya, S P; Das, K K
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    Infant mortality in an urban locality of Calcutta.
    (1979-07-01) Das, K K; Rahman, A; Sen, A K; Mukherjee, P K
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    Influence of ascorbic acid on acid and alkaline phosphatase activities in some metabolically active tissues of aspirin treated rats.
    (1997-10-11) Das, K K; Dasgupta, S
    ACP and ALP activities in plasma were increased in aspirin treated groups for a period of seven days. Ascorbic acid supplemented groups showed no significant change in plasma ACP activity, but a significant change in ALP activity was found. ACP and ALP activities in liver and kidney were decreased significantly in aspirin treated animals. ACP activities in liver and kidney in ascorbic acid supplemented groups showed no significant changes. No significant alteration of ALP activity in liver was found in ascorbic acid supplemented group but a significant changes was observed in kidney. Supplementation of ascorbic acid in high doses to rats fed aspirin can restore enzyme activities almost to the normal level.
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    Large capillary haemangioma arising from the nasal columella--a case report.
    (2001-05-26) Bora, H; Bandyopadhyay, S N; Sinha, R; Bhunia, R; Mukherjee, S; Das, K K; Mukherjee, P B
    A 39-year-old male presented with a mass arising from the nasal columella for last 8 months. The mass was lobulated, dark red in colour, firm in consistency and approximately 3 cm in diameter. It was attached to the columella of the nose by a narrow stalk. The mass was excised completely under general anaesthesia and histopathological examination suggested it to be a case of capillary haemangioma.
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    Malathion exposed seeds of Vigna sinensis (L): changes at protein & nucleic acid levels.
    (1980-08-01) Chakrabarti, S; Dastidar, S G; Das, K K; Banerjee, S K