226
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Sarkar M, Mookerjea S. Recovery of dolichyl diphosphate oligosaccharide in methanolic aqueous phase prepared from rat liver microsomal fractions. Biochem J 1986; 236:913-6. [PMID: 3790096 PMCID: PMC1146926 DOI: 10.1042/bj2360913] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The synthesis of dolichyl diphosphate oligosaccharide was studied by incubating rat liver microsomes (microsomal fractions) with GDP-[14C]mannose, UDP-glucose, UDP-N-acetylglucosamine and [3H]dolichol phosphate. The labelled products obtained by the first step of extraction of the microsomes in methanolic aqueous phase (MAP fraction in chloroform/methanol/water; 3:2:1, by vol.) and in CMW fraction (chloroform/methanol/water; 10:10:3, by vol.) obtained by extraction of the interphase after the first step of extraction were analysed on a DEAE-cellulose column. With the progress of incubation, the radioactivity in unchanged GDP-mannose decreased, whereas the labelled dol-P-P-oligo in the MAP fraction increased about 5-6-fold. The lipid oligosaccharide in this fraction accounted for about 50-60% of the GDP-mannose used, whereas the recovery of the labelled lipid oligosaccharide in the CMW fraction was about 10%. The lipid oligosaccharide from both reactions after mild acid hydrolysis were analysed by gel filtration on Bio-Gel P-4. The oligosaccharide from the MAP fraction gave a peak of higher Mr distinctly separate from the lower-Mr peak obtained from the CMW fraction. Microsomes incubated with labelled lipid oligosaccharide from the MAP fraction showed incorporation of the label into endogenous protein.
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227
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Abstract
Antibodies to myoglobin were immobilized by covalent linkage to polyester film for use in a solid-phase ELISA. The covalent linkage of antibody to this new solid phase was accomplished by partial acid hydrolysis of the film followed by periodate oxidation. About 60 ng of protein could be immobilized per cm2 of film and the binding was stable. Antimyoglobin IgM immobilized on the films was used in the ELISA technique to detect myoglobin within the range 0.25-10 ng. The assay procedure was found to be very accurate and the coefficient of variation of each concentration ranged from 0.63 to 2.1%. Furthermore the immobilized film could be re-used after dissociating the antigen antibody complexes.
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228
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Sarkar M, Mookerjea S. Effect of dexamethasone on the synthesis of dolichol-linked saccharides and glycoproteins in hepatocytes prepared from control and inflamed rats. Biochem J 1985; 227:675-82. [PMID: 4004787 PMCID: PMC1144888 DOI: 10.1042/bj2270675] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Hepatocytes were prepared from control and inflamed rats. The incorporation of [14C]mannose into protein was increased in inflamed compared with control hepatocytes. The incorporation of [14C]mannose into protein was also increased when the hepatocytes were cultured in presence of dexamethasone (1 microM), either from control or inflamed rats. At the same time the incorporation of [14C]mannose into dolichol phosphate mannose and dolichol-linked oligosaccharide was increased due to inflammation. The presence of dexamethasone in the hepatocyte culture caused an increased formation of these two products; in particular its effect on oligosaccharide lipid formation was very pronounced. The ratios of activities of formation of [14C]mannose-labelled oligosaccharide lipid in inflamed over control hepatocytes gradually decrease when increasing amounts of exogenous dolichol phosphate was added in cell homogenate assay mixture. These results suggest that the increase of oligosaccharide lipid formation in inflammation could be due to a higher concentration of endogenous dolichol phosphate, as was shown for dolichol phosphate mannose formation in inflammation [Sarkar & Mookerjea (1984) Biochem. J. 219, 429-436]. In contrast, the ratio of activities of [14C]mannose-labelled oligosaccharide lipid between dexamethasone-treated and untreated hepatocytes shows only a slight increase when increasing concentrations of exogenous dolichol phosphate were added to the assays. This suggests that the stimulation of dolichol pyrophosphate oligosaccharide synthesis observed in dexamethasone treatment is probably due to the higher level of enzymes involved in oligosaccharide synthesis rather than higher level of endogenous dolichol phosphate in these cells.
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229
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Abstract
An electrophoretically homogeneous agglutinin was purified from the albumin gland of Achatina fulica snails using asialofetunin-Sepharose 4B as an affinity column. The agglutinin was found to be temperature sensitive; it agglutinated rabbit and human umbilical cord erythrocytes only at low temperature. It was found to be specific for methyl-beta-D-galactoside, and the best inhibitor was N-acetyllactosamine.
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230
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Sarkar TK, Tchang F, Sarkar M. Pulmonary necrobiotic nodule. J Rheumatol 1984; 11:557-8. [PMID: 6481733] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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231
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Fraser IH, Coolbear T, Sarkar M, Mookerjea S. Increase of sialyltransferase activity in the serum and liver of inflamed rats. BIOCHIMICA ET BIOPHYSICA ACTA 1984; 799:102-5. [PMID: 6428461 DOI: 10.1016/0304-4165(84)90282-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Induction of inflammation by turpentine injection caused 1.5-2-fold increase of both sialyl- and galactosyltransferase activity in liver homogenates. The effect was apparent after 12 h of turpentine treatment. Serum sialyltransferase activity started to increase in the inflamed rats after 18 h, reaching a maximum of 4-fold at 48 h. In contrast, galactosyltransferase activity in serum showed no significant increase. The coordinated and temporal increase of sialyltransferase activity in liver and serum suggest involvement of a specific mechanism for the preferential release of this enzyme into serum.
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232
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Collins J, Saxena U, Sarkar M, Nagpurkar A, Mookerjea S. Synthesis and secretion of serum phosphorylcholine-binding protein by rat hepatocytes. BIOCHIMICA ET BIOPHYSICA ACTA 1984; 799:97-101. [PMID: 6375732 DOI: 10.1016/0304-4165(84)90281-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The incorporation of [1-14C]glucosamine into rat serum phosphorylcholine-binding protein in an isolated rat hepatocyte system was used to demonstrate the synthesis and secretion of this protein by the liver. The hepatocytes after incubating with colchicine resulted in an increased intracellular accumulation of phosphorylcholine-binding protein and less of the synthesized phosphorylcholine-binding protein was secreted into the medium. The synthesis of phosphorylcholine-binding protein was found to be significantly impaired when the hepatocytes were incubated with tunicamycin. The radiolabelled phosphorylcholine-binding protein co-eluted with exogenous phosphorylcholine-binding protein as a homogeneous peak by affinity chromatography. The identity of the radiolabelled phosphorylcholine-binding protein was further established by quantitative immunoprecipitation, polyacrylamide gel electrophoresis and isoelectric focusing.
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233
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Sarkar M, Mookerjea S. Effect of dexamethasone on mannolipid synthesis by hepatocytes prepared from control and inflamed rats. Biochem J 1984; 219:429-36. [PMID: 6743227 PMCID: PMC1153499 DOI: 10.1042/bj2190429] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Hepatocytes were prepared from control and inflamed rats. Mannose incorporation into dolichol monophosphate mannose in homogenate and microsomal fraction of the hepatocytes was increased 2-fold over the controls 24 h after induction of inflammation by turpentine injection. Incubation of hepatocytes from both control and inflamed rats with 0.1-10 microM-dexamethasone produced a 1.5-fold increase of dolichol phosphate mannose formation, whereas, 100 microM-dexamethasone decreased its formation. The increase in the ratio of dolichol phosphate mannose formation in inflamed over controls was virtually eliminated when the cell homogenate assay mixtures included 30 nmol of exogenous dolichol phosphate. This supports the earlier suggestion that the increase in the enzyme activity in inflammation could be due to higher concentrations of endogenous dolichol phosphate [ Coolbear & Mookerjea (1981) J. Biol. Chem. 256, 4529-4535]. In contrast, the increase in the ratio of dolichol phosphate mannose formation between dexamethasone-treated and untreated hepatocytes remained unchanged when increasing concentrations of exogenous dolichol phosphate were added to the assays. This suggests that the increase in glycosylation of dolichol phosphate in dexamethasone-treated hepatocytes is probably due to the increased mannosyltransferase activity, rather than due to higher concentrations of endogenous dolichol phosphate in these cells.
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234
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Abstract
Homogeneous enzyme immunoassay has been used as a tool for the determination of diosgenin and its glycosides in plants. Diosgenin antisera was found to inhibit the activity of diosgenin hemisuccinate-horseradish peroxidase conjugate which was reversed by the addition of free diosgenin or its glycosides. The increase of enzyme activity was proportional to the quantity of the hapten over a certain range of hapten concentration. Thus, a minimum of 2.5 micrograms/ml of diosgenin and 11.5 micrograms/ml of diosgenin glycosides could be determined by this method. The results were comparable with those obtained by high-performance liquid chromatography and gravimetric methods.
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235
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Chowdhury M, Sarkar M. Estradiol benzoate induced changes in protein synthesis and lysosomal hydrolases in the pituitary of male rats. Biochem Biophys Res Commun 1983; 116:230-6. [PMID: 6315002 DOI: 10.1016/0006-291x(83)90405-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
In vitro protein synthesis, lysosomal hydrolases activity and peroxidase activity in the anterior pituitary were estimated in adult male rats treated with 50 micrograms of estradiol benzoate (EB) for 1 day or 7 days. Pituitary protein synthesis, protein and RNA content increased after 7 days. A significant increase in total and membrane-bound acid phosphatase was noted after 1 day or 7 days of EB treatment whereas total beta-glucuronidase activity decreased in both 1 and 7 day group. Cathepsin activity increased after 7 days and pituitary peroxidase system did not change by EB treatment. These findings suggest that immediate change in the enzyme milieu may be one of the first reactions by which EB expresses its feedback control.
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236
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Ghatak U, Sanyal B, Ghosh S, Sarkar M, Raju M, Wenkert E. Additions and Corrections - A Formylation-Cyclization Method of Synthesis of Cycloalkenones from Unsaturated Ketones. J Org Chem 1982. [DOI: 10.1021/jo00148a603] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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237
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Sarkar M, Wu AM, Kabat EA. Immunochemical studies on the carbohydrate specificity of Maclura pomifera lectin. Arch Biochem Biophys 1981; 209:204-18. [PMID: 7283438 DOI: 10.1016/0003-9861(81)90273-3] [Citation(s) in RCA: 94] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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238
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Maitra SB, Mukherjee A, Sarkar M, Hati AK. Fever in Indian kala-azar: the type and the delayed response to therapy. JOURNAL OF THE INDIAN MEDICAL ASSOCIATION 1981; 76:25-6. [PMID: 7252203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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239
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Mommsen H, Sarkar M, Sarter W, Schmittinger T. Enhancement correction in high energy particle induced X-ray emission analysis. ACTA ACUST UNITED AC 1979. [DOI: 10.1016/0029-554x(79)90523-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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240
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Sarkar M, Liao J, Kabat EA, Tanabe T, Ashwell G. The binding site of rabbit hepatic lectin. J Biol Chem 1979; 254:3170-4. [PMID: 429341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
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241
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242
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Swarup-Mitra S, Chowdhury AK, Sarkar M. Inhibition of some erythrocytic enzymes in kala-azar. Indian J Med Res 1979; 69:571-6. [PMID: 457197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
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243
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Mitra S, Sarkar M. Study of the pre- and postoperative gynaecological cases with special reference to the changes in the electrolyte balance (sodium and potassium). JOURNAL OF THE INDIAN MEDICAL ASSOCIATION 1978; 70:247-50. [PMID: 712082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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244
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Seeley RL, Sarkar M, Smith JL. The borderline fluorescent treponema antibody. Neuro-ophthalmological status. ARCHIVES OF OPHTHALMOLOGY (CHICAGO, ILL. : 1960) 1972; 87:16-20. [PMID: 4550268 DOI: 10.1001/archopht.1972.01000020018003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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245
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Smith JL, David NJ, Indgin S, Israel CW, Levine BM, Justice J, McCrary JA, Medina R, Paez P, Santana E, Sarkar M, Schatz NJ, Spitzer ML, Spitzer WO, Walter EK. Neuro-ophthalmological study of late yaws and pinta. II. The Caracas project. Br J Vener Dis 1971; 47:226-51. [PMID: 4936861 PMCID: PMC1048203 DOI: 10.1136/sti.47.4.226] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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246
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Das Gupta NN, Sarkar M, Misra DN. Electron microscopic studies on denatured DNA from Escherichia coli. J Mol Biol 1966; 15:619-23. [PMID: 5330749 DOI: 10.1016/s0022-2836(66)80131-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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247
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Sarkar M. V.D. Campaign in Calcutta. THE INDIAN MEDICAL GAZETTE 1947; 82:634-635. [PMID: 29014954 PMCID: PMC5190929] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
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248
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Sarkar M. Fevers in Pregnancy. THE INDIAN MEDICAL GAZETTE 1934; 69:238. [PMID: 29009060 PMCID: PMC5158815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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