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Sarkar S, Panda S, Sarkar K, Hangzo CZ, Bijaya L, Singh NY, Das N, Agarwal A, Chatterjee A, Deb BC. A cross-sectional study on factors including HIV testing and counselling determining unsafe injecting practices among injecting drug users of Manipur. Indian J Public Health 1995; 39:86-92. [PMID: 8690497] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
In India, a steep increase in the prevalence of HIV (0% to 50% within six months) among the IDUs has been reported in Manipur, a north eastern state in 1990. In spite of large scale intervention program like educational campaign and widespread voluntary HIV testing in this state, the infection has quickly spread to the heterosexual population at large. The determinants of risk taking behaviors like sharing of unclean needle among the IDU population has been explored in this paper. A cross sectional study has been carried out among all of the 488 IDUs who attended any detoxification centers and prison during last two years at Imphal, the capital city of this state. Self reported behaviors based on the pre-scheduled interview were recorded and participation rate was satisfactory. The data was compared to a similar survey carried out by us in 1990. Although there has been decline in risk behavior among the IDUs, a logistic regression analysis reveals that unsafe needle sharing behavior is not influenced by the knowledge on HIV transmission, educational status or history of HIV testing or serostatus of the individual. The limitation of cross sectional nature of the study, bias due to collection of data in prison, self reported behavior, possible differences with street samples of the addict are discussed.
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Medda S, Das N, Mahato SB, Mahadevan PR, Basu MK. Glycoside-bearing liposomal delivery systems against macrophage-associated disorders involving Mycobacterium leprae and Mycobacterium tuberculosis. INDIAN JOURNAL OF BIOCHEMISTRY & BIOPHYSICS 1995; 32:147-51. [PMID: 7590855] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Asiaticoside, a plant glycoside with rhamnose as end sugar and having microbicidal properties was tested against Mycobacterium leprae and Mycobacterium tuberculosis both in vivo and in vitro. As rhamnose is reported to have no tissue specificity, corchorusin D having glucose as end sugar was used for targeting with an equimolar proportion of asiaticoside in liposomal form for testing the drug value. Results showed that liposomal asiaticoside had better microbicidal property against M. leprae and M. tuberculosis when compared to that of free asiaticoside whereas liposomes containing asiaticoside and corchorusin D were found to be equally or more active in comparison to liposomal asiaticoside alone. It is inferred that appropriate glycosides, if used in liposomal form (incorporated or covalently grafted) have enhanced drug efficacy and such glycoside bearing liposomes as targeted delivery systems could be used for chemotherapeutic control of several other diseases.
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153
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Das N, Mukherjee M. Conditions for isolation of regenerating protoplasts fromPleurotus sajorcaju. J Basic Microbiol 1995. [DOI: 10.1002/jobm.3620350306] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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154
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Abstract
Thirty pairs of monozygotic (MZ) and 20 pairs of dizygotic (DZ) twins, of both sexes, were studied to estimate the role of genetic and environmental factors determining fitness measurements comprising vital capacity (VC), vertical jump, flexibility, agility, and PFI score. Intra-pair variances for VC, vertical jump, and heart rate were significantly smaller (p < 0.05-0.01) in MZ than in DZ twins, where values for flexibility, agility, and PFI were insignificant. Intra-pair correlations for VC, vertical jump, and heart rate were higher (p < 0.01) in MZ than in DZ twins where the opposite was found in the case of flexibility and agility. The correlation value for PFI was higher in both MZ and DZ twins. Following adjustment for physical characteristics including age, weight, and height, none of the results of all the residual fitness measurements were similar to the unadjusted values. Both unadjusted and residual variables with smaller intra-pair variances showed higher heritability estimates. These results suggest that VC, vertical jump, and heart rate are influenced more by genetic factors than environmental factors where the inverse is true of flexibility, agility, and PFI. Thus, the genetic and environmental influence of all the fitness measurements, except VC, more or less depend upon physical characteristics in this study.
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155
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Chatterjee S, Mandal A, Das N. Physical and motor fitness level of Indian school-going boys. J Sports Med Phys Fitness 1993; 33:268-77. [PMID: 8107480] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
A cross-sectional study of physical and motor fitness measurements was undertaken on 629 healthy Indian (Bengalee) school-going boys of 9-18 years. The study brought to light gradual increase in physical and motor fitness measurements with the advancement of age except physical fitness score. Major increments were recorded between 13 and 15 years of age. All the fitness test scores showed significant positive correlations with age, height and weight but Dash, Shuttle Run and PFI showed significantly negative relationship. Indian boys of the present study were superior in Sit and Reach and inferior in Vertical Jump to the Belgian boys of comparable ages. These boys showed higher values in Vertical Jump than American boys after the age of 13. Dash and Shuttle Run test scores of Indian boys fall between 15th to 25th and 30th to 45th percentiles of American Standard respectively. Besides, American boys are superior in Grip Strength to Indian boys. Percentile values of physical and motor fitness test scores of Indian (Bengalee) boys are, therefore, useful for determining their present fitness status and potentiality in that particular community for specific sports activity.
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156
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Medda S, Mukherjee S, Das N, Naskar K, Mahato SB, Basu MK. Sugar-coated liposomes: a novel delivery system for increased drug efficacy and reduced drug toxicity. Biotechnol Appl Biochem 1993; 17:37-47. [PMID: 8439403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
The uptake of glycoside-bearing liposomes by macrophages has been studied in vitro. Since the uptake was found to be specific for the end sugar attached to the glycoside, the possibility is raised that glycoside-bearing liposomes might be used in vivo as systems to deliver drugs to macrophages. Using the antileishmanial drug urea stibamine, these delivery systems have been tested in vivo against model leishmaniasis. The results indicate that the drug encapsulated in sugar-coated liposomes is much more potent in comparison with normal liposome-encapsulated drug or to the free drug. Mannose-grafted liposomes are more efficient in transportation of drugs compared with those bearing glucose. Toxicity studies involving blood parameters, histological staining of tissues and specific enzyme activities related to liver function, show no apparent toxicity with the drugs. Hence, drug encapsulated sugar-coated liposomes may have possible applications to humans.
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Das AK, Mazumdar SK, Das N, Talapatra SK, Scheiner P, Schwalbe CHW. Structure of a nucleoside analogue: α-(1-thyminylmethyl)-γ-butyrolactone. Acta Crystallogr C 1993. [DOI: 10.1107/s0108270192008655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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158
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Das AK, Datta M, Mazumdar SK, Das N, Aerschot A, Low JN, Howie RA. Crystal structure of a nucleoside analog: 1-(R)-[6-(R)-hydroxymethyl-1,4-dioxan-2-yl] uracil. ACTA ACUST UNITED AC 1992. [DOI: 10.1007/bf01195405] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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159
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Odyuo L, Jana D, Das N. Food intake and rumination behaviour of lactating and non-lactating buffaloes reared under a loose housing system. Appl Anim Behav Sci 1991. [DOI: 10.1016/0168-1591(91)90151-m] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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160
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Bhattacharya P, Dey S, Das N, Bhattacharyya BC. Rapid mass propagation of Chrysanthemum morifolium by callus derived from stem and leaf explants. PLANT CELL REPORTS 1990; 9:439-442. [PMID: 24227173 DOI: 10.1007/bf00232268] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/1990] [Revised: 09/25/1990] [Indexed: 06/02/2023]
Abstract
A procedure for rapid multiplication of Chrysanthemum morifolium RAMAT cv. Birbal Sahni using leaf callus and stem (nodal/internodal) callus as well as node and apical shoots has been developed. Murashige and Skoog's medium (1962) supplemented with 2mg/1 2,4-D yielded good green calli from both leaf and stem segments within 2 weeks. About 1 cm × 1 cm callus regenerated 2-3 shoots after 3 weeks on MS solid medium supplemented with 0.1 mg/l IAA and 0.2 mg/l BAP. Each of the regenerated shoots when transferred to the same shooting medium without agar yielded about 150 new shoots, which in turn regenerated roots after another week in MS half strength or modified White's media (Rangaswamy, 1961). It has been estimated that about 10(14) plantlets could be produced in a year from one expiant following the proposed protocol.
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Medda S, Das N, Bachhawat BK, Mahato SB, Basu MK. Targeting of plant glycoside-bearing liposomes to specific cellular and subcellular sites. Biotechnol Appl Biochem 1990; 12:537-43. [PMID: 2288709] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The possibility of using liposomes as an effective drug delivery system has been studied by incorporation of two plant glycosides of varying terminal sugar residues onto the surface of liposomes and examination of their distribution in different tissues. The two glycosides, corchorusin D and asiaticoside having glucose and rhamnose respectively at the terminal ends wee selected for the purpose. The hepatic uptake of liposomes made from egg lecithin, cholesterol and dicetyl phosphate and either of the two glycosides was compared. The hepatic uptake of asiaticoside bearing liposomes was reduced, whereas that of corchorusin D bearing liposomes was enhanced and was specific for glucose. Liver perfusion followed by cell separation showed that the uptake is mostly into the non-parenchymal cells of liver. The distribution of corchorusin D bearing liposomes was maximal in the lysosomal fraction of the non-parenchymal cells. Ways of using corchorusin D bearing liposomes as delivery systems for drugs or enzymes to lysosomes have been sought.
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Bhattacharya SK, Das N, Dasgupta G. Central modulation of croton oil induced subacute inflammation in rats. INDIAN JOURNAL OF EXPERIMENTAL BIOLOGY 1990; 28:683-5. [PMID: 1980265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Earlier studies from this laboratory have indicated that CNS exerts a modulatory influence over acute inflammation in rats. The present study examines the existence of a similar modulatory effect of CNS on a subacute inflammatory paradigm, the croton oil-induced granuloma pouch in rats. The inflammatory exudate, collected on 6th day after croton oil administration, was found to be substantially less in intracerebroventricular (icv) cannulated and artificial cerebrospinal fluid administered rats as compared to their uncannulated saline (ip) administered counterparts. This effect may be due to stress induced by cannulation. Centrally administered pharmacological agents which attenuate central monoaminergic, cholinergic or prostaglandin systems had insignificant effects on the inflammatory exudate. However, induced increase in central noradrenergic activity was found to attenuate the inflammation when the treatment was done before, but not 48 hr after, the induction of the inflammation. In contrast, induced increase in central serotonergic activity had no effect on the volume of the inflammatory exudate at either time period. Steady state levels of rat brain noradrenaline and serotonin, but not dopamine, were enhanced by the inflammatory procedure. However, these effects may be attributed to the stress induced by croton oil inflammation. The investigation indicates that the modulatory influence of CNS remains limited to the acute phase of inflammation, being exerted mainly by the central noradrenergic system. Once the inflammation has progressed, this modulatory influence of CNS is no longer apparent.
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Das N, Mahato SB, Naskar K, Ghosh DK, Basu MK. Targeting of urea stibamine encapsulated in liposomes to reticuloendothelial system for the treatment of experimental leishmaniasis. BIOCHEMICAL MEDICINE AND METABOLIC BIOLOGY 1990; 43:133-9. [PMID: 2346669 DOI: 10.1016/0885-4505(90)90018-v] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The antileishmanial antimonial drug urea stibamine was encapsulated in mannosylated and nonmannosylated liposomes and was tested against experimental leishmanial infection in hamsters. The study demonstrated that liposome encapsulation of urea stibamine enhanced its effectiveness, an effect which was greater when mannosylated liposomes were used.
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Das J, Das N. Synthesis of Quinaldinic Acid Amide Derivative of Styrene-Divinylbenzene Copolymer and its Application in Preconcentration of Mercury (II). ANAL LETT 1988. [DOI: 10.1080/00032718808066524] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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165
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Bhattacharya SK, Das N, Rao PJ. Brain monoamines during carrageenan-induced acute paw inflammation in rats. J Pharm Pharmacol 1988; 40:518-20. [PMID: 2904998 DOI: 10.1111/j.2042-7158.1988.tb05292.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Paw inflammation was induced in rats by sub-plantar administration of carrageenan. Significant inflammatory oedema was observed 1 h later and the peak effect was noted between 3-4 h. The oedema was markedly reduced after 12-24 h. Steady state levels of whole brain and hypothalamic monoamines were estimated spectrofluorometrically during the course of the carrageenan-induced paw inflammation. In addition, the rate of accumulation of the brain 5-hydroxytryptamine (5-HT) and noradrenaline (NA) was assessed in clorgyline-pretreated rats during the inflammation. The whole brain and hypothalamic concentrations of 5-HT and NA were augmented during the early phase of the inflammation, but fell below control values when peak inflammation was achieved. Thereafter, the monoamine levels tended to normalize by 24 h when the inflammation had virtually subsided. On the contrary, whole brain and hypothalamic dopamine levels remained largely unaffected. The rate of accumulation of brain 5-HT and NA were enhanced during carrageenan inflammation, indicating that the turnover of these monoamines is augmented during the inflammatory process. The results suggest that acute peripheral inflammation may significantly affect central 5-HT and noradrenergic activity in rats.
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Bhattacharya SK, Mohan Rao PJ, Das N, Das Gupta G. Intracerebroventricularly administered bradykinin augments carrageenan-induced paw oedema in rats. J Pharm Pharmacol 1988; 40:367-9. [PMID: 2899636 DOI: 10.1111/j.2042-7158.1988.tb05270.x] [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: 01/03/2023]
Abstract
Intracerebroventricular (i.c.v.) administered bradykinin (2.5 and 5.0 micrograms/rat) was found to augment carrageenan-induced acute paw oedema throughout the 4 h post-carrageenan observation period. The effect was statistically significant with the higher dose. The pro-inflammatory effect of i.c.v. bradykinin was antagonized following pretreatment with hemicholinium and atropine ethoiodide administered i.c.v., drugs that reduce central cholinergic activity. Similarly, central administration of drugs that inhibit the synthesis of eicosanoids, hydrocortisone, diclofenac and paracetamol, also attenuated the pro-inflammatory effect of bradykinin. The findings indicate that the inflammation-promoting effect of centrally administered bradykinin involves the central prostaglandin and cholinergic neurotransmitter systems.
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Mediratta PK, Das N, Gupta VS, Sen P. Modulation of humoral immune responses by endogenous opioids. J Allergy Clin Immunol 1988; 81:27-32. [PMID: 2448356 DOI: 10.1016/0091-6749(88)90216-3] [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: 01/01/2023]
Abstract
The effects of opioid agonists and antagonists were investigated on humoral immune mechanisms in mice and rats. Opioid agonists like morphine, Leu-enkephalin, and Met-enkephalin, enhanced antigen-induced histamine release from mixed peritoneal cells of rats in vitro; this enhancement was effectively antagonized by naloxone, an opioid antagonist. Naloxone, per se, decreased anaphylactic mortality in doses of 10 mg/kg, while it increased mortality in a dose of 1 mg/kg. Reduced IgE antibody titer, measured by passive cutaneous anaphylaxis, decreased hemagglutination titer to sheep red blood cells, blocked histamine release from mixed peritoneal cells of rats in vitro induced by antigen, but had no significant effect when histamine release was induced by compound 48/80. Thus, it appears that endogenous opioids are involved in humoral immune responses.
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168
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Das N. Sex preference and fertility behavior: a study of recent Indian data. Demography 1987; 24:517-30. [PMID: 3428452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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169
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Das N, Bachhawat BK, Mahato SB, Basu MK. Plant glycosides in a liposomal drug-delivery system. Biochem J 1987; 247:359-61. [PMID: 3426542 PMCID: PMC1148416 DOI: 10.1042/bj2470359] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Plant glycosides were incorporated into the liposomal surface to study their sugar-specific uptake by various tissues. Two steroid glycosides, namely floribundasaponin D, with rhamnose as terminal sugar, and gracillin, with glucose and rhamnose as end sugars, were selected for the purpose. 125I-human IgG encapsulated liposomes composed of egg lecithin (phosphatidylcholine), cholesterol, dicetyl phosphate (optional) and either floribundasaponin D or gracillin, when injected into the tail vein of rat, showed significantly higher uptake in the rat liver than in appropriate controls. Whereas the uptake of floribundasaponin D liposomes was observed to be non-specific, the increased uptake of the gracillin liposomes, as judged from the inhibition studies with asppropriate sugars, was specific for glucose, although the receptor was unable to distinguish between the alpha and beta anomers ('anomerically blind'). The liver-perfusion studies showed that the uptake of gracillin liposomes was mostly by non-parenchymal cells.
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Bhattacharya SK, Das N, Rao PJ. Effect of pre-existing inflammation on carrageenan-induced paw oedema in rats. J Pharm Pharmacol 1987; 39:854-6. [PMID: 2891829 DOI: 10.1111/j.2042-7158.1987.tb05134.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Twenty-four hours after injection of carrageenan into one hind paw, injection of the same amount into the contralateral paw produced a significantly attenuated inflammatory response. However, when the second injection was given 7 days later, the inflammation induced in the contralateral paw was comparable with the initial response to carrageenan. A time-course study of carrageenan-induced inflammation in rats showed that significant oedema persisted 24 h after carrageenan administration and complete recovery was achieved in 7 days. The attenuated inflammatory response in the contralateral paw after 24 h was antagonized by bilateral adrenalectomy and chemical sympathectomy induced by 6-hydroxydopamine. Carrageenan-induced paw oedema was also significantly less in rats with subacute inflammation induced by the croton oil granuloma pouch technique. This attenuated response was antagonized by pretreatment of the rats with metyrapone, an inhibitor of adrenocorticoid synthesis, and by 6-hydroxydopamine. It is likely that the pre-existing acute or subacute inflammation attenuates the inflammatory response of carrageenan, by acting as a stressor, inducing activation of the sympatho-adrenal system.
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Das N, Bora NS, Panchamoorthy G, Srivastava LM. Circulating immune complex in myocardial infarction. Indian J Med Res 1987; 86:74-8. [PMID: 3692562] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
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172
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Bhattacharya SK, Das N, Sarkar MK. Inhibition of carrageenin-induced pedal oedema in rats by immobilisation stress. RESEARCH IN EXPERIMENTAL MEDICINE. ZEITSCHRIFT FUR DIE GESAMTE EXPERIMENTELLE MEDIZIN EINSCHLIESSLICH EXPERIMENTELLER CHIRURGIE 1987; 187:303-13. [PMID: 3114846 DOI: 10.1007/bf01852056] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The effect of immobilisation stress on acute pedal inflammation induced by carrageenin, and the mechanism of stress-induced anti-inflammatory effect, were investigated in male Wistar strain albino rats. Carrageenin-induced pedal inflammation oedema was attenuated by immobilisation stress in a time-dependent manner, when the rats were restrained for 30 min, 1 h, and 2 h immediately after the induction of the inflammation. Pentobarbitone exhibited significant anti-inflammatory effect of its own in an anaesthetic dose and also inhibited stress (1 h)-induced attenuation of the inflammation. Likewise, lignocaine, injected behind the knee joint of the inflamed limb, attenuated the inflammation and also inhibited the stress-induced anti-inflammatory effect. These findings indicate the importance of the central nervous system (CNS) and the afferent/efferent neural pathways from and to the inflammatory site, in inflammation and in stress-induced anti-inflammatory effect. Earlier studies from this laboratory have shown that the central noradrenergic, histaminergic, serotonergic and GABA-ergic neurotransmitter systems have a modulatory anti-inflammatory effect on carrageenin-induced pedal oedema. Since all these neurotransmitter systems have been reported to be activated by stress, their role was assessed in the inflammation-attenuation effect of immobilisation stress. The present studies indicate that, of these neurotransmitters, only the central noradrenergic system is involved in the anti-oedema effect of stress. Endogenous opioid peptides may also be involved in the stress-inflammation interaction, since naloxone inhibited the stress effect. Bilateral adrenalectomy and peripheral chemical sympathectomy, induced by i.p. administration of 6-hydroxydopamine, augmented carrageenin oedema and antagonised the stress-induced anti-inflammatory effect. However, metyrapone, an inhibitor of endogenous corticoid synthesis, failed to inhibit the stress effect. These findings indicate that the sympatho-medullary system, which is known to be activated during stress, is responsible for the observed anti-inflammatory effect of immobilisation stress, rather than augmented release of adrenal corticoids. It is suggested that the observed inflammation reducing effect of immobilisation stress is a consequence of increased central noradrenergic and peripheral sympatho-medullary activity.
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173
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Das N, Basu MK, Das MK. Suppression of liver uptake of orally fed liposomes by injection (i.p.) of dextran sulfate 500. Biosci Rep 1987; 7:465-70. [PMID: 2447976 DOI: 10.1007/bf01116502] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
125Iodine labelled human immunoglobulin-G encapsulated liposomes were administered orally to rats. Distribution of radioactivity was checked in various tissues and in portal blood. The effect of dextran sulfate (DS 500,000 m. wt., liver blockade agent) injection (i.p.) on the liver uptake of liposomes and on the amount of liposomes appearing in the portal blood from the gastrointestinal tract have been studied. An increased amount of radioactivity was observed in the portal blood and the amount of radioactivity in the liver decreased appreciably after injection of dextran sulfate. In both the cases the action of dextran sulfate started 2 hours after injection and reached maximum at 12 hour, falling slightly at 24 hour.
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Bhattacharya SK, Das N. Central catecholaminergic modulation of carrageenin-induced pedal oedema in rats. RESEARCH IN EXPERIMENTAL MEDICINE. ZEITSCHRIFT FUR DIE GESAMTE EXPERIMENTELLE MEDIZIN EINSCHLIESSLICH EXPERIMENTELLER CHIRURGIE 1986; 186:365-74. [PMID: 3797823 DOI: 10.1007/bf01852102] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Intracerebroventricularly (i.c.v.) administered noradrenaline (NA) and L-dopa, but not dopamine (DA), attenuated carrageenin-induced pedal oedema in rats. Centrally administered reserpine and the catecholaminergic neurotoxin, 6-hydroxydopamine (6-HD), augmented the inflammatory oedema. Pharmacological treatments, which selectively increase central DA, induce DA neurone degeneration and affect DA receptor activity, were singularly ineffective in modifying the inflammatory response of carrageenin. Centrally administered phentolamine, an alpha-adrenergic receptor antagonist, produced a dose-related dual effect on the peripheral oedema. Lower doses of phentolamine produced a paradoxical NA-like oedema-attenuating effect, which was not evident in 6-HD-treated rats; however, a larger dose of the drug had no per se effect but antagonised the oedema-inhibiting effect of centrally administered NA. Propranolol, a beta-adrenergic receptor antagonist produced inconsistent effects, with a lower and higher dose of the drug showing no effect, while a median dose induced an inhibitory effect on the peripheral oedema. Bilateral adrenalectomy failed to antagonise the anti-inflammatory effect of central NA, but peripheral degeneration of sympathetic neurones, induced by i.p. administered 6-HD, inhibited the effect of NA. The results of the study indicate that central NA, but not DA, exerts a modulatory inhibitory effect on peripheral oedema induced by carrageenin. This effect of central NA appears to be dependent upon the peripheral sympathetic system and not on the activation of the adrenal corticoid activity.
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Das N, Das MK. Effect of cholesterol content on the efficacy of liposomes in oral administration. INDIAN JOURNAL OF BIOCHEMISTRY & BIOPHYSICS 1986; 23:242-4. [PMID: 3570346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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176
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Bhattacharya SK, Das N. Anti-inflammatory effect of intraventricularly administered histamine in rats. AGENTS AND ACTIONS 1985; 17:150-2. [PMID: 4096304 DOI: 10.1007/bf01966584] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Intracerebroventricularly (icv) administered histamine (5, 10 and 20 micrograms) produced a dose-related anti-inflammatory effect against carrageenin-induced pedal edema in rats. The effect of histamine was mimicked by the H1 receptor agonist, 2-methylhistamine, but not by the H2 receptor agonist, 4-methylhistamine. The anti-inflammatory effect of centrally administered histamine was antagonised by mepyramine, a H1 receptor antagonist, but not by cimetidine, a H2 receptor antagonist. The anti-inflammatory effect of icv histamine was inhibited in bilaterally adrenalectomised rats but was unaffected by peripheral chemical sympathectomy induced by 6-hydroxydopamine.
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177
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Bhattacharya SK, Das N. Effect of central prostaglandins on carrageenan-induced pedal oedema in rats. J Pharm Pharmacol 1984; 36:768-9. [PMID: 6150983 DOI: 10.1111/j.2042-7158.1984.tb04870.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
The possible modulatory effect of central prostaglandins (PGs) on carrageenan-induced pedal inflammation, was investigated in rats. Intracerebroventricularly (i.c.v.) administered arachidonic acid, the PG precursor, produced a statistically insignificant increase in the inflammatory response, though PG synthesis inhibitors, administered by the same route, markedly attenuated the oedema. Centrally administered PGE2 had a significant pro-inflammatory effect, whereas PGF2 alpha exerted an anti-inflammatory action. The results indicate that central PGs may modulate peripheral inflammation and that, at least partly, the anti-inflammatory activity of PG synthesis-inhibiting non-steroidal anti-inflammatory agents may involve central PGs, as has been proposed for their analgesic effect.
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Das N, Das MK, Bachhawat BK. Detection of liposomes in portal blood following oral administration. JOURNAL OF APPLIED BIOCHEMISTRY 1984; 6:346-52. [PMID: 6549539] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/05/2023]
Abstract
125Iodine-labeled human immunoglobulin G-encapsulated dipalmitoyl phosphatidylcholine liposomes were prepared with or without asialoganglioside. Distribution of radioactivity following the oral administration of these liposomes in rats was checked in liver and in blood of the portal vein and heart. Gel filtration of plasma from the portal vein showed the presence of intact liposomes and protein. In contrast, neither liposomes nor protein were detected in cardiac blood but only lower molecular weight materials. The presence of liposomes in portal blood was further suggested from experiments using 6-carboxyfluorescein-entrapped liposomes. The level of liposomes in portal venous blood plasma was found to be lower in asialoganglioside liposomes. But this level could be increased substantially, almost to that in liposomes without asialoganglioside, by injection (iv) of asialofetuin.
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179
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Bhattacharya SK, Das N. Effect of carrageenin-induced pedal edema on rat brain prostaglandins. NEUROCHEMICAL PATHOLOGY 1984; 2:163-9. [PMID: 6599129 DOI: 10.1007/bf02834350] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Carrageenin-induced pedal inflammation in rats, was found to significantly enhance brain levels of prostaglandin (PG) E2 and PGF2 alpha. PG levels increased after 30 min of induction of the inflammation, peaked at 1 h, and attained normal levels by 4 h. Bilateral adrenalectomy had little effect on carrageenin-induced increase in rat brain PGs. The pattern of elevation of central PGs and the time course of carrageenin inflammation were at variance, the latter peaking between 3 and 4 h. The findings lend credence to the postulate that inflammatory hyperalgesia involves participation of central pain circuits, and that fever accompanying inflammation is caused by the central release of PGs. The central nociceptive and hyperthermic actions of PGs are well documented. However, the increase in central PG levels may well be caused by stress induced by the peripheral inflammation, since the pattern of elevation in either case is qualitatively similar.
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Abstract
Donovanosis (granuloma inguinale), a disease often related to sexual contact, has been a clinical problem in Papua New Guinea for more than 9 decades. It is a common cause of anogenital lesions in females in this country. Lesions on the cervix or vaginal vault, and extension of the disease process from the external genitalia to the uterus, tubes and ovaries, are thought to be rare. In this study an attempt was made to discover the frequency of involvement of cervix, uterus and adnexae, with or without external genital involvement, by retrospectively analyzing the histological and clinical records of patients with anogenital donovanosis for a period of 8 years (1975-1982). In 35 of 351 patients (10%), donovanosis involved the cervix. The clinical profile of these cases, certain unusual features in a few cases, and the pathological findings are discussed.
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181
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Sachdeva NK, Shah LK, Vaidyanathan S, Das N, Rao MS. Nephrobronchial fistula. Closure by thoraco-abdominal approach and the use of free fascia lata graft. (A case report). J Postgrad Med 1983; 29:108-10, 110A. [PMID: 6631758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
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182
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Bhattacharya SK, Ghosh P, Das N. Role of putative neurotransmitters in cannabis-induced potentiation of the anticonvulsant action of phenobarbitone. Indian J Med Res 1982; 76 Suppl:131-5. [PMID: 6136460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
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183
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Das N, Rao YV, Das PK, Bhattacharya SK. Effect of centrally administered monoaminergic & cholinergic receptor antagonists on carrageenin-induced pedal edema in rats. INDIAN JOURNAL OF EXPERIMENTAL BIOLOGY 1982; 20:409-11. [PMID: 7129536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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184
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Vaidyanathan S, Rao MS, Chary KS, Sharma PL, Das N. Enhancement of detrusor reflex activity by naloxone in patients with chronic neurogenic bladder dysfunction. Preliminary report. J Urol 1981; 126:500-2. [PMID: 7288940 DOI: 10.1016/s0022-5347(17)54596-6] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
An intravenous injection of 0.4 mg. naloxone enhanced detrusor reflex activity in 5 patients with chronic neurogenic bladder dysfunction caused by incomplete suprasacral spinal lesions. The intravesical volume at which detrusor reflex occurred showed a decrease from 498.2 to 346.2 ml. The naloxone-induced effect was short-lived, being absent 1 hour after the injection. In the same dosage naloxone did not induce detrusor reflex in 2 patients with areflexic bladder caused by complete suprasacral spinal lesions.
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185
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Garg A, Kunwar K, Das N, Gupta PK. Endosulfan intoxication: Blood glucose, electrolytes, Ca levels, ascsorbic acid and glutathione in rats. Toxicol Lett 1980; 5:119-23. [PMID: 7466837 DOI: 10.1016/0378-4274(80)90160-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Endosulfan-induced changes in blood glucose, plasma electrolytes, and blood and brain ascorbic acid, hexokinase and glutathione have been investigated following acute and subacute administration in 12 h fasted male rats. After a single oral dose of endosulfan (40 mg/kg) a significant increase in blood glucose, blood ascorbic acid, and blood and brain glutathione was observed. The maximum increase in blood was observed at 2 h (36%). Increase in blood and brain glutathione was highly significant at 4 h (50 and 43%, respectively). The blood ascorbic acid slowly increased by 19% over control during the treatment period. No significant change in brain hexokinase was observed. Repeated oral administration of endosulfan (0.625 to 20 mg/kg) for 7 weeks had no effect on plasma sodium and potassium. At the highest dose (20 mg/kg), blood glucose was slightly increased (16%). Plasma Ca was significantly decreased, the maximum fall (35%) being observed at 4 h.
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186
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Zikmund V, Das N, Krishnayengar R, Kameswara Rao B. Contribution to the problem of challenge vaccination. Observations on vaccination of cured smallpox cases in India in 1971, 1972 and 1973. Indian J Public Health 1978; 22:102-6. [PMID: 669754] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
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187
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188
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Das N. Advanced simultaneous intrauterine and abdominal pregnancy. A case report. BRITISH JOURNAL OF OBSTETRICS AND GYNAECOLOGY 1975; 82:840-2. [PMID: 1191593 DOI: 10.1111/j.1471-0528.1975.tb00585.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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189
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Purkayastha BC, Das N. Study of transition temperature through mixed crystal formation. III. Orthorhombic zinc sulphate and magnesium sulphate. Aust J Chem 1973. [DOI: 10.1071/ch9731243] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Distribution studies with
orthorhombic zinc sulphate and magnesium sulphate as hosts and 54Mn
as guest have been carried out in order to determine the transition
temperatures of different phases. The change in morphology of either the host
or the guest is always indicated by a prominent change in distribution values
at the point of transition. In the present study, with zinc sulphate as host
and 54Mn as guest, the transition temperatures of the two
components, orthorhombic MnSO4,7H2O and MnSO4,6H2O,
were found to be 10� and 42.5�C respectively. The host component ZnSO4,7H2O
transforms to its lower hydrate ZnSO4,6H2O at 38.95�C.
Distribution studies with MgSO4,7H2O as host and 54Mn
tracer as guest also confirm that MnSO4,6H2O undergoes
transition at 42.5�C. Isolation of MnSO4,6H2O in finite
concentration has been achieved by cocrystallizing with stable and well defined
ZnSO4,6H2O at 42�C.
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Das N, Srere PA. Exchange of methyl protons of acetyl coenzyme A catalyzed by adenosine triphosphate citrate lyase. Biochemistry 1972; 11:1534-7. [PMID: 5021604 DOI: 10.1021/bi00758a031] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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191
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192
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Das N, Cottam GL, Srere PA. The citrate cleavage enzyme: release of phosphate from the phosphoenzyme. Arch Biochem Biophys 1971; 143:602-8. [PMID: 5558137 DOI: 10.1016/0003-9861(71)90245-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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193
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Maji S, Das N, Bose A. Surface tension of cell types in differentiating CNS of chick. EXPERIENTIA 1971; 27:159-60. [PMID: 5544726 DOI: 10.1007/bf02145868] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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194
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Das N, Ray HN. A hyperparasite of Entamoeba suis from the Indian domestic pig Sus scrofa. THE JOURNAL OF PROTOZOOLOGY 1968; 15:383-5. [PMID: 5750643 DOI: 10.1111/j.1550-7408.1968.tb02141.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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195
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Das N. Inguinal Hernia. (A Record of 104 Cases). THE INDIAN MEDICAL GAZETTE 1944; 79:3-7. [PMID: 29011997 PMCID: PMC5155748] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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196
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Hajra BB, Das N. Thrombophlebitis of the Cavernous Sinus. THE INDIAN MEDICAL GAZETTE 1941; 76:40. [PMID: 29013457 PMCID: PMC5184876] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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197
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