3526
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3527
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Rosen Y, Chen C. Infarction of the gallbladder: a complication of hypertension. Case report. Am J Gastroenterol 1977; 67:249-52. [PMID: 868844] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A case of gallbladder infarction, occurring in a 34-year old man with severe hypertension is described, with uneventful recovery following cholecystectomy. In the absence of other obvious etiologic factors, the gallbladder infarction is presumed to be directly related to hypertensive vascular disease. Infarction of the gallbladder is rare; a few cases associated with hypertension have been previously reported. Other types of vascular disease including embolization, thrombosis complicating atherosclerosis and celiac angiography, polyarteritis nodosa, occlusion following torsion and cystic vein thrombosis have been reported to cause gallbladder infarction.
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3528
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Chen C, Simons MJ, Ratnam SS. Immunity to modified seminal plasma antigens associated with subfertility. Acta Obstet Gynecol Scand 1977; 56:515-21. [PMID: 341638 DOI: 10.3109/00016347709155023] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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3529
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Chen C, Tu M. Transannular dioxygenation of 9,10-dimethyl-1,2-benzanthracene by cytochrome P-450 oxygenase of rat liver. Biochem J 1976; 160:805-8. [PMID: 13786 PMCID: PMC1164298 DOI: 10.1042/bj1600805] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
9,10-Dimethyl-1,2-benzanthracene is oxygenated by rat liver microsomal cytochrome P-450 oxygenase to its 9,10-epidioxide. This transannular 1,4-peroxide is converted further into the diol by the microsomal preparation and NADPH. These two products constitute the majority of the metabolites found under the conditions described.
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3530
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3531
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3532
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Chen C, Gettes LS. Combined effects of rate membrane potential, and drugs on maximum rate of rise (Vmax) of action potential upstroke of guinea pig papillary muscle. Circ Res 1976; 38:464-9. [PMID: 1269096 DOI: 10.1161/01.res.38.6.464] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
We studied the effect of increasing the rate of stimulation on the maximum rate of rise of the action potential upstroke (Vmax) in guinea pig papillary muscles at various resting membrane potentials and after the addition of quinidine and lidocaine to the perfusate. Increasing rate caused a decrease in Vmax due to interaction of three factors: (1) a metabolic factor, presumably resetting of the Na-K pump, which caused a decrease in Vmax at all levels of resting potential between -90 and -60 mV, (2) a transient decrease in resting potential which influenced Vmax when the resting potential was less negative than approximately -80 mV, and (3) the recovery characteristics of Vmax which contributed to the decrease in this variable when rate was faster than 5/sec. As a result of these factors the steady state curve relating membrane potential to Vmax was itself rate-dependent. Lidocaine and quinidine exaggerated the rate-dependent decrease in Vmax; however, their effects differed. The effect of quinidine was consistent with its known depressant effect on the Na-K pump. The lidocaine effect was consistent with a slowing of recovery of Vmax. Our results help to explain the effects of an increase in rate on Vmax and conduction velocity in normal, partially depolarized, and drug-treated fibers
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3533
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Gaudin G, Chen C. [The use of Tibéral in vaginites of trichomonas in a single application (author's transl)]. SCHWEIZERISCHE RUNDSCHAU FUR MEDIZIN PRAXIS = REVUE SUISSE DE MEDECINE PRAXIS 1976; 65:626-7. [PMID: 790376] [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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3534
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Ng AY, Chen C, Ratnam SS. Hysteroscopic sterilization with quinacrine sulphate and electrocoagulation. Aust N Z J Obstet Gynaecol 1976; 16:38-9. [PMID: 1067080 DOI: 10.1111/j.1479-828x.1976.tb02653.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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3535
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Chen C, Samejima K, Tamura Z. A gas chromatographic determination method of 5-chloro-7-iodo-8-quinolinol and its conjugates in biological fluids. Chem Pharm Bull (Tokyo) 1976; 24:97-101. [PMID: 131650 DOI: 10.1248/cpb.24.97] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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3536
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Wishnow RM, Lifrak E, Chen C. Interaction of cholera enterotoxin with cultured adrenal tumor cells. Infect Immun 1975; 12:768-71. [PMID: 172445 PMCID: PMC415354 DOI: 10.1128/iai.12.4.768-771.1975] [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: 12/13/2022] Open
Abstract
In the adrenal tumor cell system ganglioside Gm1 inhibited cholera enterotoxin (CT)-induced steroidogenesis if it was preincubated with the toxin or added to adrenal cells 10 min before CT. In the preincubation studies a molar ratio of Gm1 to toxin of 3:1 was necessary for half-maximal inhibition of steroidogenesis. On the other hand, horse serum anticholeragenoid neutralized the steroidogenic response to cell-bound CT by 50% if it was added to adrenal monolayer cultures 15 min after the toxin. Specific antiserum was able to neutralized 20% of the toxin-induced activity even if it was added to adrenal cultures 2 h after CT. Phase contrast microscopy demonstrated that partial neutralization of the biochemical effect of CT by horse serum anticholeragenoid was accompanied by partial prevention of toxin-induced rounding of adrenal cells. Further studies showed that pretreatment of cultured adrenal cells with a maximal dose of CT increased cyclic adenosine 3'-5'-monophosphate formation in response to a maximal stimulating dose of adrenocorticotropin. This result suggested potentiation of hormonal activation of adenylate cyclase in intact adrenal tumor cells in response to CT.
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3537
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Ozawa H, Uematsu T, Chen C. [Pharmacological studies of aminoguanidines. I. Hypotensive and some general pharmacological actions of benzyl- and benzylidene-hydrazino-3,4,5,6-tetrahydropyrimidines (author's transl)]. YAKUGAKU ZASSHI 1975; 95:966-74. [PMID: 1237612 DOI: 10.1248/yakushi1947.95.8_966] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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3538
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Chen C, Smith OC, McChesney J. Biosynthesis and cytokinin activity of 8-hydroxy and 2,8-dihydroxy derivatives of zeatin and N-6(increment-2-isopentenyl)adenine. Biochemistry 1975; 14:3088-93. [PMID: 1148191 DOI: 10.1021/bi00685a008] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
8-Hydroxy and 2,8-dihydroxy derivatives of the cytokinins, 6-(4-hydroxy-3-methyl-trans-2-butenylamino)purine and N-6-(increment -2-isopentenyl)adenine, have been biosynthesized by xanthine oxidase oxidation. 8-Hydroxy derivatives have been shown to be the major intermdeiates. These compounds were tested for cytokinin activity in the tobacco bioassay. The results suggest that substitution of the 8 position with a hydroxyl group causes less decrease of cytokinin activity than substitution of both the 2 and 8 positions with hydroxyl groups.
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3539
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Chen C, Fuller JL. Neonatal thyroxine administration, behavioral maturation, and brain growth in mice of different brain weight. Dev Psychobiol 1975; 8:355-61. [PMID: 1225702 DOI: 10.1002/dev.420080409] [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: 12/26/2022]
Abstract
L-thyroxine in amounts of .5, 1, and 2 mug was injected daily from age 5 through 14 days in 3 lines of mice selected for high (H), medium (M), or low (L) brain weight. Controls (injected with vehicle only) of these lines differed in ages of eye-opening, first auditory startle, and perfection of a surface-righting response. Thyroxine at .5 mug/day accelerated the maturation of eye-opening, auditory startle, and aerial-righting response, but had no effect on a grasping response or open-field activity. Brain weights were depressed significantly in all thyroxine treated groups except in the 9k-mug dosage in H mice.
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3540
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Cheng MC, Khew KS, Chen C, Ratnam SS, Seng KM, Tan WK. Culdoscopic ligation as an outpatient procedure. Am J Obstet Gynecol 1975; 122:109-12. [PMID: 1130441 DOI: 10.1016/0002-9378(75)90623-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The increasing demand for abortion and sexual sterilization has caused the need to perform such operations on an outpatient basis. The University Department of Obstetrics and Gynaecology, Singapore, started a prospective study of culdoscopic ligation as an outpatient procedure in November, 1972. To date, over 600 operations have been performed. Analysis of the first 405 cases showed a low complication rate of 2.4 per cent. This study showed that culdoscopic ligation performed in the hospital outpatient is safe and feasible.
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3541
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Lee C, Oyasu R, Chen C. In vitro interaction of estrogen and prolactin on hormone-dependent rat mammory tumors (38511). Exp Biol Med (Maywood) 1975; 148:224-6. [PMID: 165526 DOI: 10.3181/00379727-148-38511] [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: 12/13/2022] Open
Abstract
Hormone-dependent, regressing mammary tumors in rats were incubated in a chemically defined culture medium containing tritium labeled leucine at 37 degrees for 2 hr. The rate of tritium incorporation into the protein fraction by these tissues was measured with and without the addition of 17beta-estradiol and/or ovine prolactin into the medium. Tumor tissue responded to either estrogen or porlactin by a 6-7% increase in the rate of 3-H-leucine incorporation. When the incubation medium contained both the hormones, the increase in the rate of 3-H leucine incorporation was 19% which was significantly greater than the sum of the effect of each single hormone measured independelntly. These results demonstrate a synergistic effect between estrogen and prolactin on rat mammary tumors.
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3542
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Chen C, Shaw YS. Cyclic metabolic pathway of a butylated hydroxytoluene by rat liver microsomal fractions. Biochem J 1974; 144:497-501. [PMID: 4468819 PMCID: PMC1168527 DOI: 10.1042/bj1440497] [Citation(s) in RCA: 37] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
A cyclic metabolic pathway was obtained when 3,5-di-t-butyl-4-hydroxytoluene (BHT) was incubated with a rat liver microsomal preparation. The pathway is as follows: BHT --> 4-hydroperoxy-4-methyl-2,6-di-t-butylcyclohexa-2,5-dienone (BHT-OOH) --> 4-hydroxy-4-methyl-2,6-di-t-butylcyclohexa-2,5-dienone (BHT-3(0)OH) --> BHT. This metabolic pathway suggests that antioxidants such as BHT owe their high efficacy, at least in part, to their metabolic regeneration.
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3543
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Chen C, Simons MJ. Counterimmunoelectrophoresis - a rapid method for the detection of antibodies to seminal plasma. IRCS JOURNAL OF INTERNATIONAL RESEARCH COMMUNICATIONS 1974; 2:1647. [PMID: 4448275] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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3544
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Jones RH, Chen C, Iwahashi H, Sealy WC, Seaber AV. Pulmonary function in dogs after left lung reimplantation. Surgery 1973; 74:593-600. [PMID: 4729224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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3545
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Crisp AH, MacKinnon PC, Chen C, Corker CS. Observations of gonadotrophic and ovarian hormone activity during recovery from anorexia nervosa. Postgrad Med J 1973; 49:584-90. [PMID: 4788838 PMCID: PMC2495602 DOI: 10.1136/pgmj.49.574.584] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Serum gonadotrophins and gonadal steroids were measured in six unmarried female patients with anorexia nervosa before and during treatment by feeding and psychotherapy, which led to restoration of weight to matched population mean levels. In three patients whose premorbid weight was normal, hormonal levels during treatment were initially low, but as weight was regained gonadotrophic levels increased and one patient showed cyclical activity. In three other patients who were premorbidly obese gonodotrophic levels did not appear to increase over the period of investigation. With the exception of one patient whose menstrual cycles were resumed during the period of investigation, gonadal steroid levels in general appeared to remain low although, subsequently, regular monthly menstrual bleeding occurred in some of these patients.
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3546
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Kelly D, Richardson A, Mitchell-Heggs N, Greenup J, Chen C, Hafner RJ. Stereotactic limbic leucotomy: a preliminary report on forty patients. Br J Psychiatry 1973; 123:141-8. [PMID: 4582235 DOI: 10.1192/bjp.123.2.141] [Citation(s) in RCA: 72] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
The neurophysiological aspects and operative technique of stereotactic limbic leucotomy have been described in a previous paper (Kelly, Richardson and Mitchell-Heggs, 1973). The present investigation is a prospective study designed to assess the results of such surgery in a group of 40 severely ill psychiatric patients, who had failed to respond satisfactorily to every other type of treatment. The results have been assessed clinically, psychologically and physiologically, in a very detailed way, at six weeks; a similar follow-up at one year is in progress. A comparison is made between the results of the present series and those of a previous: study (Kelly et al., 1972), in which more extensive leucotomy operations were carried out, and similar means of assessment were employed.
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3547
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3548
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Lewis D, Chen C, Woods G, Culpin L. A modified p-anisidine technique for the detection and permanent recording of free and combined fructose on paper chromatograms. J Chromatogr A 1972. [DOI: 10.1016/s0021-9673(01)86172-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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3549
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Chen C, Hirsch JG. The effects of mercaptoethanol and of peritoneal macrophages on the antibody-forming capacity of nonadherent mouse spleen cells in vitro. J Exp Med 1972; 136:604-17. [PMID: 4559193 PMCID: PMC2139267 DOI: 10.1084/jem.136.3.604] [Citation(s) in RCA: 235] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Nonadherent mouse spleen cells exhibited poor viability and little or no capacity to form antibodies to sheep red cells in the Mishell-Dutton culture system. Viability and antibody-forming capacity could be restored by addition to these cultures of low concentrations of mercaptoethanol (10(-4)-10(-5)M), or by addition of appropriate numbers of mouse peritoneal macrophages. Macrophage concentrations lower than optimal resulted in lower lymphoid cell viability and correspondingly fewer plaque-forming cells, whereas excess macrophages resulted in marked inhibition of antibody formation despite good viability of the lymphocytes. Restoration of the nonadherent cells with mercaptoethanol was thus much simpler and more reproducible than it was with macrophages; furthermore, the number of plaque-forming cells developed in cultures restored with mercaptoethanol was approximately fourfold higher than it was in cultures restored with optimal numbers of macrophages. In the presence of mercaptoethanol, the plaque-forming capacity of the nonadherent spleen cells was not increased when small numbers of macrophages were added to the system, nor was it decreased when the few macrophages present in the nonadherent cells were further reduced or eliminated. Excess macrophages inhibited antibody formation in the cultures containing mercaptoethanol as they did in control cultures. Optimal restoration of plaque-forming capacity to the nonadherent spleen cells with mercaptoethanol required the reducing agent to be present throughout the 4 or 5 day culture period. Addition of mercaptoethanol 1 or more days after initiation of culture, or transfer of the cells to a medium free of mercaptoethanol before completion of the culture resulted in a reduction in the numbers of plaque-forming cells. The results suggest that mouse lymphoid cells do not require macrophages in order to form antibodies to sheep red cells in vitro, provided mercaptoethanol is present in the culture medium. The mechanism of action of mercaptoethanol under these conditions is not completely clear, but one of its effects is to promote the viability of lymphoid cells in the cultures.
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3550
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Shaw YS, Chen C. Ring hydroxylation of di-t-butylhydroxytoluene by rat liver microsomal preparations. Biochem J 1972; 128:1285-91. [PMID: 4404965 PMCID: PMC1174016 DOI: 10.1042/bj1281285] [Citation(s) in RCA: 33] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
3,5-Di-t-butylhydroxytoluene (compound I) was converted into 4-hydroperoxy-4-methyl-2,6-di-t-butylcyclohexa-2,5-dienone (compound II), 4-hydroxy-4-methyl-2,6-di-t-butylcyclohexa-2,5-dienone (compound III) and 2,6-di-t-butyl-4-hydroxymethylphenol (compound IV) by rat liver microsomal preparations in the presence of NADPH and air. The oxidation of compound (I) by m-chloroperbenzoic acid also produced the same compounds. These results suggest that hydroperoxide can be an intermediate in aromatic hydroxylation and that biological oxygenations resemble per-acid reactions.
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