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Singaram C, Sengupta A, Stevens C, Spechler SJ, Goyal RK. Localization of calcitonin gene-related peptide in human esophageal Langerhans cells. Gastroenterology 1991; 100:560-3. [PMID: 1985053 DOI: 10.1016/0016-5085(91)90231-9] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Previously undescribed calcitonin gene-related peptide-immunoreactive intraepithelial cells were seen in specimens of esophageal mucosa obtained by biopsy or surgical resection from 14 individuals. These calcitonin gene-related peptide-immunoreactive cells were sparsely seen in normal mucosa but increased markedly in esophagitis. They were inaccessible to routine histological stains, but osmication showed them as dendritic forms resembling Langerhans cells of the skin. Their cytological identity was determined with immunocytochemical tests for human antigenic markers such as Ia, HLA-DR, and OKT6 for Langerhans cells, Leu-M5 and Leu-M3 for intraepithelial macrophages, CD3 and TCR-1 for T-lymphocytes, Leu-14 for B-lymphocytes, S-100 for Merkel cells, and chromogranin for amine precursor uptake and decarboxylation cells. Double localization showed that calcitonin gene-related peptide immunoreactivity colocalized with Ia, HLA-DR, and OKT6 but not with the other markers. These studies show that intraepithelial Langerhans cells in the esophageal mucosa contain calcitonin gene-related peptide, which may serve as an immunomodulator.
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177
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Sengupta A, Dutta S, Mallick R. Modulation of cervical carcinogenesis by tamoxifen in a mouse model system. Oncology 1991; 48:258-61. [PMID: 2023707 DOI: 10.1159/000226938] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Insertion of cotton thread impregnated with beeswax and 20-methylcholanthrene (carcinogen) inside the canal of the uterine cervix in intact and oophorectomized mice results in the expression of dysplasia and carcinoma of the cervical epithelium. Based upon the experimental cervical carcinogenesis observed in this mouse model system, the present study shows distinctly the modulatory effect of tamoxifen on the incidence of cervical carcinoma. Besides this, tamoxifen significantly lengthens the latent period for both dysplasia and carcinoma in the cervical epithelium. This manifestation was found more marked in oophorectomized animals.
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178
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Chaudhuri S, Sinha A, Sengupta A, Chaudhuri S. Sheep erythrocytes provide metabolic triggers for tumour phagocytosis in polymorphonuclear neutrophils: a possible mechanism of tumour inhibition in mice. BIOCHEMISTRY INTERNATIONAL 1991; 23:231-41. [PMID: 1650200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Intraperitoneal (i.p.) injection of 7% Sheep Erythrocytes (SRBC) was found to inhibit growth of a transplanted tumour and exhibit a consequent increase in total survival compared to untreated tumour controls. In an attempt to probe into the mechanism(s) involved, functional aspects of Polymorphonuclear Neutrophils (PMNs) were investigated in terms of their 'metabolic (respiratory) burst' during tumour phagocytosis. Both NADPH-Oxidase mediated superoxide anion (O2-.) formation (NBT reduction) and Myeloperoxidase (MPO) mediated oxidisable halide incorporation (131I incorporation) were found to be highly stimulated by SRBC in normal (CS) and tumour bearing counterparts (TS). A little tumour mediated residual inhibition persists on the MPO system in PMNs of animals with tumour plus SRBC (TS) which, however, showed an obvious bonus effect over the tumour controls (TC). The results suggest a possible mechanism of tumour inhibition by SRBC in mice with the involvement of highly stimulated phagocytic metabolism in PMNs.
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179
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Prasad R, Khare S, Sengupta A, Sirkar KK. Novel liquid-in-pore configurations in membrane solvent extraction. AIChE J 1990. [DOI: 10.1002/aic.690361018] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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180
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181
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Sengupta A, Bandyopadhyay S. Deadlock-free routing in k-ary hypercube network in presence of processor failures. INFORM PROCESS LETT 1990. [DOI: 10.1016/0020-0190(90)90017-r] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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182
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Printz H, Saluja A, Leli U, Sengupta A, Steer M. Effects of hemorrhagic shock, aspirin, and ethanol on secretagogue-induced experimental pancreatitis. INTERNATIONAL JOURNAL OF PANCREATOLOGY : OFFICIAL JOURNAL OF THE INTERNATIONAL ASSOCIATION OF PANCREATOLOGY 1990; 6:207-17. [PMID: 1697883 DOI: 10.1007/bf02924289] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The effects of hemorrhagic shock, aspirin, and ethanol on the biochemical and morphologic changes of experimental pancreatitis were evaluated. Pancreatitis was induced by infusing rats with a supramaximally stimulating dose (5 micrograms/kg/h) of caerulein. Hemorrhagic shock was established by removing sufficient blood to reduce mean arterial pressure by 30%, where it was maintained for 30 min. Aspirin (25 mg/kg) and ethanol (2 g/kg) were administered through an orogastric tube at 8-h intervals for 48 h. Hemorrhagic shock did not alter the degree of hyperamylasemia, pancreatic edema, cathepsin B subcellular redistribution, or in vitro LDH leakage that characterize this model of pancreatitis. Hemorrhagic shock did, however, worsen the morphologic evidence of pancreatic injury. Administration of aspirin with ethanol did not alter the degree of hyperamylasemia, pancreatic edema, or subcellular cathepsin B redistribution. Aspirin-ethanol pretreatment also did not alter the morphologic severity of pancreatitis. These observations indicate that hemorrhagic shock worsens the microscopic evidence of pancreatitis induced by supramaximal secretagogue stimulation. In contrast, aspirin-ethanol pretreatment, which might have been expected to increase pancreatic ductal permeability, did not alter the severity of this model of experimental pancreatitis.
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183
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Singaram C, Sengupta A, Spechler SJ, Goyal RK. Mucosal peptidergic innervation of the opossum esophagus and anal canal: a comparison with snout skin. JOURNAL OF THE AUTONOMIC NERVOUS SYSTEM 1990; 29:231-40. [PMID: 1692856 DOI: 10.1016/0165-1838(90)90149-d] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Nerves within and under the esophageal epithelium of the opossum esophagus were investigated morphologically with osmication and immunohistochemically for ten neuropeptides. The structurally similar but functionally diverse epithelia of the anal canal and snout skin, on which no immunohistochemical information exists, were similarly investigated for comparison. Total innervation was estimated from osmication, which revealed intraepithelial nerves in all three tissues in the following order of density: snout skin greater than anal canal greater than esophagus. Calcitonin gene-related peptide and substance P occurred in all three organs. The snout skin had intraepithelial galanin nerves but not vasoactive intestinal polypeptide, while conversely the esophagus and anal canal had vasoactive intestinal polypeptide but not galanin. All peptides found intraepithelially also occurred subepithelially. Calcitonin gene-related peptide, galanin, neuropeptide Y, substance P and vasoactive intestinal polypeptide subepithelial nerves occurred in all the tissues, while gastrin releasing peptide nerves occurred infrequently in the subepithelial regions of the esophagus and anal canal, but not the snout skin. As these epithelia neither secrete nor absorb, their nerves are presumably sensory. The peptides investigated could not account for all intraepithelial nerves demonstrated by osmium. Differences in the innervation of these epithelia may result from their differing sensory requirements.
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184
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Bandyopadhyay S, Sengupta A, Sen A. A robust protocol for distributed query processing on a local area network. INFORM SYST 1990. [DOI: 10.1016/0306-4379(90)90025-k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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185
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Bandyopadhyay R, Sengupta A, Das J. A mutation in the dam gene of Vibrio cholerae: 2-aminopurine sensitivity with intact GATC methylase activity. Biochem Biophys Res Commun 1989; 165:561-7. [PMID: 2688642 DOI: 10.1016/s0006-291x(89)80003-8] [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: 01/02/2023]
Abstract
Vibrio cholerae mutants sensitive to 2-aminopurine (2AP) but with DNA adenine methylase activity similar to parental cells have been isolated. The mutant strains were sensitive to ultraviolet light (UV), methyl methane sulphonate (MMS) and 9-aminoacridine. The spontaneous mutation frequency of the mutants were not significantly affected. Attempts to isolate dam V. cholerae cells by screening 2AP sensitive cells have not been successful. All the mutant phenotypes could be suppressed by introducing the plasmid pRB103 carrying the dam gene of Escherichia coli into the mutant cells.
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186
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Ohshio G, Saluja A, Leli U, Sengupta A, Steer ML. Failure of a potent cholecystokinin antagonist to protect against diet-induced pancreatitis in mice. Pancreas 1989; 4:739-43. [PMID: 2813332 DOI: 10.1097/00006676-198912000-00013] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The effects of a potent cholecystokinin (CCK) receptor antagonist, L-364,718, on two forms of experimental acute pancreatitis in mice were evaluated. The antagonist prevented the hyperamylasemia, pancreatic edema, and acinar cell vacuolization that followed administration of a supramaximally stimulating dose of the cholecystokinin analogue cerulein. In contrast, the same dose of L-364,718 (1 mg/kg/6 h) and an even higher dose (10 mg/kg/6 h) failed to prevent the hyperamylasemia, acinar cell necrosis, and mortality that followed administration of a choline-deficient ethionine-supplemented diet. These observations are at variance with those previously reported to follow administration of the relatively weak cholecystokinin antagonist proglumide (Niederau C et al. J Clin Invest 1986;78:1056-63). The observations reported in this communication suggest that cholecystokinin does not play an important role in diet-induced pancreatitis and that CCK receptor antagonists are unlikely to be of benefit in the treatment of clinical acute pancreatitis.
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187
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Saluja AK, Saluja M, Printz H, Zavertnik A, Sengupta A, Steer ML. Experimental pancreatitis is mediated by low-affinity cholecystokinin receptors that inhibit digestive enzyme secretion. Proc Natl Acad Sci U S A 1989; 86:8968-71. [PMID: 2479032 PMCID: PMC298412 DOI: 10.1073/pnas.86.22.8968] [Citation(s) in RCA: 76] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Rats infused with a supramaximally stimulating dose of the cholecystokinin (CCK) analog caerulein develop acute edematous pancreatitis. Using CCK-JMV-180, a recently developed CCK analog that acts as an agonist at high-affinity CCK receptors but antagonizes the effect of CCK at low-affinity receptors, we have determined that caerulein induces pancreatitis by interacting with low-affinity CCK receptors. Those low-affinity receptors mediate CCK-induced inhibition of digestive enzyme secretion from the pancreas. Our observations, therefore, suggest that this form of experimental pancreatitis results from the inhibition of pancreatic digestive enzyme secretion.
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188
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Chatterjee SS, Das MK, Dutta S, Ghosh S, Sengupta A, Guha S, Choudhury D, Das Biswas A, Mitra D, Maity AK. Experience with balloon valvuloplasty in pulmonary stenosis. Indian Heart J 1989; 41:182-5. [PMID: 2777302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Fourteen patients of pure valvular pulmonary stenosis of moderate to severe degree underwent balloon valvuloplasty in the Department of Cardiology, SSKM Hospital, Calcutta. Haemodynamic study revealed that immediately after valvuloplasty, right ventricular pressure dropped down from 125 +/- 17.18 mmHg. to 56.67 +/- 8.72 mmHg. (mean +/- SD). Restudy was done in each case after 4 weeks, which showed that right ventricular systolic pressure had further dropped down to 46.71 +/- 5.06 mmHg. (Mean +/- SD). Patients were further followed up for 6 to 15 months (mean 10 months). During the follow-up period, all the patients remained asymptomatic. Drop of right ventricular systolic pressure was maintained except in one case in which the peak systolic pressure gradient across the pulmonary valve was raised to 61 mmHg. from 24 mmHg., the gradient achieved immediately after valvuloplasty.
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189
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Ohshio G, Saluja AK, Leli U, Sengupta A, Steer ML. Esterase inhibitors prevent lysosomal enzyme redistribution in two noninvasive models of experimental pancreatitis. Gastroenterology 1989; 96:853-9. [PMID: 2464526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
Abstract
Earlier studies have indicated that lysosomal enzymes such as cathepsin B become redistributed within pancreatic acinar cells during the early stages of both diet- and secretagogue-induced acute pancreatitis. As a result, cathepsin B and digestive zymogens became colocalized within large cytoplasmic vacuoles. As cathepsin B can activate trypsinogen, this colocalization could result in intracellular digestive enzyme activation. The present study investigates the protective effects of gabexate mesilate (FOY) and camostate (FOY 305) on both of these noninvasive models of experimental pancreatitis. These esterase inhibitors prevented the hyperamylasemia, pancreatic edema, and acinar cell vacuolization that characterize secretagogue-induced pancreatitis and the hyperamylasemia and mortality that characterize diet-induced pancreatitis. In addition, FOY and FOY 305 were found to significantly decrease the subcellular redistribution of cathepsin B that occurs in both models. These findings indicate that enzyme activity sensitive to inhibition by FOY and FOY 305 may be critical to the redistribution phenomenon that characterizes both of these models of pancreatitis.
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190
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Sengupta A, Liu WK, Yeung YG, Yeung DC, Frackelton AR, Stanley ER. Identification and subcellular localization of proteins that are rapidly phosphorylated in tyrosine in response to colony-stimulating factor 1. Proc Natl Acad Sci U S A 1988; 85:8062-6. [PMID: 2460861 PMCID: PMC282354 DOI: 10.1073/pnas.85.21.8062] [Citation(s) in RCA: 86] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
To investigate growth factor-mediated signal transduction, we have studied phosphorylation events that take place within seconds of the binding of colony-stimulating factor 1 (CSF-1) to its cell-surface receptor. CSF-1 stimulated rapid tyrosine phosphorylation of cellular proteins in murine BAC1.2F5 macrophages at 37 degrees C and 4 degrees C. The pattern of CSF-1-stimulated tyrosine phosphorylation of at least 15 different proteins at both temperatures was similar and unchanged by treatment of the lysate with reducing agent. With the exception of the 185-kDa CSF-1 receptor, a 260-kDa protein and a 133-kDa protein, the proteins were predominantly cytoplasmic. At 37 degrees C, all the proteins were phosphorylated within 30 sec of addition of growth factor. At 4 degrees C, CSF-1 receptor sites were saturated after 2 min of incubation in the presence of high concentrations of CSF-1 and differences in the order of appearance of phosphorylated proteins were observed: 185 kDa (CSF-1 receptor) (by 2 min); 99 kDa (by 4 min); 125 kDa (by 10 min); 61 kDa (by 30 min); and 260 kDa, 84 kDa, and 41 kDa (by 180 min). In addition to stimulating the phosphorylation of these proteins in tyrosine, CSF-1 caused dephosphorylation of phosphorylated serine residues on the receptor. As neither CSF-1 nor its receptor is internalized at 4 degrees C, analysis of these early reactions and the phosphotyrosine-containing proteins in intact cells under these conditions should lead to an understanding of the early events in growth factor receptor-mediated signal transduction.
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191
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192
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Sengupta A, Basu R, Sirkar KK. Separation of solutes from aqueous solutions by contained liquid membranes. AIChE J 1988. [DOI: 10.1002/aic.690341014] [Citation(s) in RCA: 82] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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193
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Rocco TA, Gray D, Easley RM, Gangemi R, Sengupta A. Single coronary artery originating from the right sinus of Valsalva. NEW YORK STATE JOURNAL OF MEDICINE 1988; 88:328-30. [PMID: 3405505] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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194
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Sidhoum M, Sengupta A, Sirkar KK. Asymmetric cellulose acetate hollow fibers: Studies in gas permeation. AIChE J 1988. [DOI: 10.1002/aic.690340309] [Citation(s) in RCA: 33] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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195
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Sengupta A, Goyal RK. Localization of galanin immunoreactivity in the opossum esophagus. JOURNAL OF THE AUTONOMIC NERVOUS SYSTEM 1988; 22:49-56. [PMID: 2450907 DOI: 10.1016/0165-1838(88)90153-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Galanin-like immunoreactivity was studied at 7 levels of the opossum esophagus, lower esophageal sphincter (LES) and adjacent portion of the stomach by indirect immunofluorescence; it was restricted to nervous structures. The majority of myenteric and submucous neurons were galanin-positive and received positive axo-somatic terminations. They also sent out axons staining positively. Galanin-positive fibers and a few atypically located neurons formed a mucous plexus at the bases of mucous glands. Varicose galanin fibers innervated the muscularis mucosae, circular and longitudinal muscle layers, while thick fascicles traversed the muscularis mucosae and circular muscle, possibly interconnecting the myenteric, submucous and mucous plexuses. Galanin-positive fibers did not supply blood vessels. There was no obvious gradient of innervation density along the esophagus, but the sphincter appeared to be more densely innervated than the esophageal body. There was no galanin-positive input to striated muscle. In view of its widespread distribution, this neuropeptide may serve multiple functions in the esophagus.
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196
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Sengupta A, Paterson WG, Goyal RK. Atypical localization of myenteric neurons in the opossum lower esophageal sphincter. THE AMERICAN JOURNAL OF ANATOMY 1987; 180:342-8. [PMID: 3321972 DOI: 10.1002/aja.1001800404] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
This study investigated sphincter-body differences in neuronal density and morphometry between the esophageal sphincter and body with a view to determining whether previously reported differences are authentic. The anatomical limits of the opossum lower esophageal sphincter were correlated with its physiological behavior by manometric demarcation. Following this, peeled whole mounts and paraffin and cryosections were used to study the morphology and morphometry of the esophageal myenteric plexus. Thirty animals were used and seven quantitated. The plexus of the esophageal body was located as usual in a plane between the longitudinal and circular muscle, which coincided with the plane of cleavage when these muscle layers were peeled apart for studying the plexus in whole mounts. In contrast, the plexus was located in several planes in the lower esophageal sphincter, which had no cleavage plane. Therefore, peeling the sphincter removes neurons and yields falsely low counts, making peel preparations of this region unsuitable for neuronal quantitation. In paraffin sections, the neuron density in the esophageal body 7 cm above the sphincter was 6,353 +/- 850/cm2, but decreased significantly to 2,254 +/- 353/cm2 at the 1-cm segment. In the lower esophageal sphincter, the neuronal count increased again to 8,530 +/- 1,606/cm2. Flash-frozen cryosections, which produced neuronal morphology similar to the in vivo condition, showed that there was no difference in neuronal size between esophageal body and sphincter. These studies show that atypical myenteric plexus localization causes spuriously low neuronal counts reported in the lower esophageal sphincter and that reported neuronal size differences are technique-dependent.
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197
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Sengupta A. The management of congenital talipes equinovarus in developing countries. INTERNATIONAL ORTHOPAEDICS 1987; 11:183-7. [PMID: 3623753 DOI: 10.1007/bf00271445] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Congenital Talipes Equinovarus often remains untreated in developing countries. At our Institute in Calcutta, where we have modern facilities, a programme was undertaken using simple techniques in selected cases. Since 1964, 5,312 cases of congenital talipes equinovarus were treated by percutaneous elongation of the Achilles tendon, plantar fasciotomy and corrective plasters. In 4,502 cases the results are good enough to recommend this technique, even in developed countries.
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198
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199
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200
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Yeung YG, Jubinsky PT, Sengupta A, Yeung DC, Stanley ER. Purification of the colony-stimulating factor 1 receptor and demonstration of its tyrosine kinase activity. Proc Natl Acad Sci U S A 1987; 84:1268-71. [PMID: 3029775 PMCID: PMC304408 DOI: 10.1073/pnas.84.5.1268] [Citation(s) in RCA: 84] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Colony-stimulating factor 1 (CSF-1) regulates the survival, proliferation, and differentiation of mononuclear phagocytes. The CSF-1 receptor was purified from cell membranes of the J774.2 mouse macrophage cell line by solubilization with Triton X-100, CSF-1 affinity chromatography, and gel filtration. The purified receptor is a protein or glycoprotein of 165 kDa comprising a single polypeptide chain that is not covalently associated, either as a homopolymer, or with any other protein. CSF-1 stimulated autophosphorylation of the purified receptor in tyrosine residues. Casein but not histone was shown to act as a substrate for the tyrosine protein kinase activity of purified receptor.
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