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Silver I, Berman JZ. What drives disagreement about moral hypocrisy? Perceived comparability and how people exploit it to criticize enemies and defend allies. Cognition 2024; 247:105773. [PMID: 38564850 DOI: 10.1016/j.cognition.2024.105773] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2023] [Revised: 03/11/2024] [Accepted: 03/13/2024] [Indexed: 04/04/2024]
Abstract
Charges of hypocrisy are usually thought to be to be damning. Yet when a hypocrisy charge is made, there often remains disagreement about whether or not its target really is a hypocrite. Why? Three pre-registered experiments (N = 2599) conceptualize and test the role of perceived comparability in evaluating hypocrisy. Calling someone a hypocrite typically entails invoking a comparison-one meant to highlight internal contradiction and cast moral character into question. Yet there is ambiguity about which sorts of comparisons are valid in the first place. We argue that disagreements about moral hypocrisy often boil down to disagreements about comparability. Although the comparability of two situations should not depend on whose behavior is being scrutinized, observers shift comparability judgments in line with social motives to criticize or defend. In short, we identify a cognitive factor that can help to explain why, for similar patterns of behavior, people see hypocrisy in their enemies but consistency in themselves and their allies.
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Affiliation(s)
- Ike Silver
- Kellogg School of Management, Northwestern University, USA.
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Berry Z, Silver I, Shaw A. Moral paragons, but crummy friends: The case of snitching. J Exp Psychol Appl 2023:2024-20873-001. [PMID: 37902697 DOI: 10.1037/xap0000501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2023]
Abstract
Loyalty to friends is an important moral value, but does that mean snitching on friends is considered immoral? Across six preregistered studies, we examine how loyalty obligations impact people's moral evaluations of snitching (i.e., turning in others who commit transgressions). In vignette and incentivized partner choice paradigms, we find that witnesses who snitch (vs. do not snitch) are seen as more moral and as better leaders (Studies 1-6), regardless of whether they snitch on a friend or an acquaintance (Studies 1-3). We find that a willingness to turn in one's friends increases perceived morality, while an unwillingness to do so diminishes it, with the latter effect exhibiting a stronger impact than the former (Study 2). Our experiments also demonstrate that snitches receive less moral credit when snitching on nonmoral (vs. moral) transgressions (Study 3) and when snitching aligns with self-interest (Study 4). We demonstrate that although snitching is often seen as morally right, turning in transgressors entails important reputational trade-offs: Snitching makes one appear disloyal and a bad friend but boosts perceptions of morality and leadership. This reveals a context in which what is loyal is no longer considered moral. (PsycInfo Database Record (c) 2023 APA, all rights reserved).
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Affiliation(s)
- Zachariah Berry
- Department of Organizational Behavior, School of Industrial and Labor Relations, Cornell University
| | - Ike Silver
- Department of Marketing, Kellogg School of Management, Northwestern University
| | - Alex Shaw
- Department of Psychology, University of Chicago
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Abstract
People care where others around them stand on contentious moral and political issues. Yet when faced with the prospect of taking sides and the possibility of alienating observers with whom they might disagree, actors often try to "stay out of it"-communicating that they would rather not to take a side at all. We demonstrate that despite its intuitive appeal for reducing conflict, opting not to take sides over moralized issues can harm trust, even relative to siding against an observer's viewpoint outright. Across eleven experiments (N = 4,383) using controlled scenarios, real press video clips, and incentivized economic games, we find that attempts to stay out of the fray are often interpreted as deceptive and untrustworthy. When actors choose not to take sides, observers often ascribe concealed opposition, an attribution of strategic deception which provokes distrust and undermines real-stakes cooperation and partner choice. We further demonstrate that this effect arises only when staying out of it seems strategic: Actors who seem to hold genuine middle-ground beliefs or who lack incentives for impression management are not distrusted for avoiding conflict. People are often asked to take sides in moral and political disagreement. Our findings outline a reputational risk awaiting those who opt not to do so. (PsycInfo Database Record (c) 2022 APA, all rights reserved).
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Silver I, Silverman J. Doing good for (maybe) nothing: How reward uncertainty shapes observer responses to prosocial behavior. Organizational Behavior and Human Decision Processes 2022. [DOI: 10.1016/j.obhdp.2021.104113] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Silver I, Mellers BA, Tetlock PE. Wise teamwork: Collective confidence calibration predicts the effectiveness of group discussion. Journal of Experimental Social Psychology 2021. [DOI: 10.1016/j.jesp.2021.104157] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Berman JZ, Silver I. Prosocial behavior and reputation: When does doing good lead to looking good? Curr Opin Psychol 2021; 43:102-107. [PMID: 34340143 DOI: 10.1016/j.copsyc.2021.06.021] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2021] [Revised: 06/24/2021] [Accepted: 06/30/2021] [Indexed: 11/19/2022]
Abstract
One reason people engage in prosocial behavior is to reap the reputational benefits associated with being seen as generous. Yet, there isn't a direct connection between doing good deeds and being seen as a good person. Prosocial actors are often met with suspicion and sometimes castigated as disingenuous braggarts, empty virtue-signalers, or holier-than-thou hypocrites. In this article, we review recent research on how people evaluate those who engage in prosocial behavior and identify key factors that influence whether observers will praise or denigrate a prosocial actor for doing a good deed.
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Affiliation(s)
- Jonathan Z Berman
- Marketing Department, London Business School, Regent's Park, London, NW1 4SA, United Kingdom.
| | - Ike Silver
- Marketing Department, The Wharton School, University of Pennsylvania, 3730 Walnut St., Philadelphia, PA, 19104, USA
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Affiliation(s)
- Ike Silver
- The Wharton School University of Pennsylvania Philadelphia PA USA
| | | | - Deborah A. Small
- The Wharton School University of Pennsylvania Philadelphia PA USA
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Silver I, Shaw A. No Harm, Still Foul: Concerns About Reputation Drive Dislike of Harmless Plagiarizers. Cogn Sci 2017; 42 Suppl 1:213-240. [DOI: 10.1111/cogs.12500] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2016] [Revised: 01/29/2017] [Accepted: 03/13/2017] [Indexed: 11/28/2022]
Affiliation(s)
- Ike Silver
- Department of Psychology; University of Chicago
| | - Alex Shaw
- Department of Psychology; University of Chicago
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Richardson D, Silver I, Dionne A. 47. Evaluation of new implementation strategies, program effectiveness and dissemination of new pedagogical knowledge: Centre for faculty development's stepping stones teaching certificate program. CLIN INVEST MED 2007. [DOI: 10.25011/cim.v30i4.2807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
This evaluation of the integrated Stepping Stones (SS) Teaching Certificate program, including its instructional development (workshops) and theory review (journal club) components, will inform further program development. Results of this project will also add to the limited amount of scholarly work in the area of faculty development program evaluation.
Faculty development literature in the area of organized program assessment reveals use of either quantitative OR qualitative methods. In this project, a novel method combining both techniques was used to explore program impact. Participants completed 2 questionnaires to identify skill-set knowledge gaps in teaching effectiveness. Pre- and post-program quantitative gaps were generated. Focus groups were used for qualitative exploration. Areas explored pre-program included: a) motives for enrollment, b) program expectations and c) prior teaching preparation. Post-program discussion explored: the impact of the program on a) participant’s perceived gaps, b) teaching behaviour change, and c) its influence on their career in education.
We believed the program’s interprofessional environment would foster development of a learning community having impact on faculty knowledge, skills and attitudes related to teaching, and potentially elicit behavioural change in teaching practices. Results from a 2004-2005 cohort of participants have identified a variety of benefits for faculty and their teaching practice. Results from a second separate cohort, 2005-2006 participants, validated the initial findings. Remarkable harmonization in the results of the qualitative analysis between the two cohort samples was evident. Statistically significant differences (p < 0.05) were found in each of the domains examined qualitatively.
Both qualitative and quantitatively, program effectiveness was demonstrated immediately following completion of the program. Follow up to assess the sustainability of the effects is ongoing. The analysis of the quantitative discrepancy (gaps) data has lead to a possible technique to assist in identifying unperceived educational needs.
McLeod PJ, Steinert Y, Nasmith L, Conochie L. Faculty Development in Canadian medical schools: a 10-year update. CMAJ 1997; 156(10):1419-23.
Hewson MG, Copeland HL, Fishleder AJ. What’s the use of faculty development? Program evaluation using retrospective self-assessments and independent performance ratings. Teach Learn Med 2001; 13(3):153-60.
Moore EM. A Framework for Outcomes Evaluation in the Continuing Development of Physicians, in: The Continuing Professional Development of Physicians. Eds. Davis D, Barnes BE, Fox R. AMA Press, 2003.
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Shumway-Cook A, Silver I, Mary L, York S, Cummings P, Koepsell T. THE EFFECTIVENESS OF A COMMUNITY-BASED MULIFACTORIAL INTERVENTION ON FALLS AND FALL RISK FACTORS IN COMMUNITY LIVING OLDER ADULTS. J Geriatr Phys Ther 2006. [DOI: 10.1519/00139143-200612000-00010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Silver I, Kim C, Mollanji R, Johnston M. Cerebrospinal fluid outflow resistance in sheep: impact of blocking cerebrospinal fluid transport through the cribriform plate. Neuropathol Appl Neurobiol 2002; 28:67-74. [PMID: 11849565 DOI: 10.1046/j.1365-2990.2002.00373.x] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Recent studies in sheep suggest that a significant proportion of global cerebrospinal fluid (CSF) drainage (50% or greater) occurs through the cribriform plate into nasal mucosal lymphatics. If this is true, obstructing CSF clearance through the cribriform plate should have an impact on the ability of the intracranial pressure regulating systems to compensate for volume infusions. To test this concept, bolus infusions of artificial CSF were administered into one lateral ventricle in sheep and the intracranial pressure monitored from the contralateral side. Peak intracranial pressures (ICP) were measured and CSF outflow resistances were calculated from the pressure patterns observed in response to bolus infusions administered before and after the cribriform plate was sealed in the same animal. To obstruct the cribriform plate, a portion of nasal bone was removed to expose the nasal mucosa. The olfactory mucosa, a portion of the nasal mucosa and all soft tissue on the extracranial surface of the cribriform plate were scraped away with a curette and the bone surface sealed with bone wax. Obstruction of CSF transport through the cribriform plate increased the peak ICP after infusion (P = 0.016) and augmented the time required for ICP to return to baseline. CSF outflow resistance was elevated approximately 2.7 times (P = 0.006). When the cribriform plate was left intact (sham surgery), no significant changes in peak ICP or CSF outflow resistance were observed. We conclude that the cribriform plate represents an important site for CSF clearance. Obstruction of this pathway reduces volumetric CSF transport significantly.
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Affiliation(s)
- I Silver
- Trauma Research Program, Department of Laboratory Medicine and Pathobiology, Sunnybrook and Women's College Health Sciences Centre, University of Toronto, Toronto, Ontario, Canada
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Abstract
OBJECTIVE The authors reviewed the literature on mental health education for primary care physicians and made recommendations for the design of educational programs and research. METHOD They searched the MEDLINE and PsycLIT databases from 1950 to 2000 by using a variety of key words and subjects. RESULTS More than 400 articles were identified, ranging from empirical studies to philosophical articles. Many identified a perceptual gap between primary care and psychiatry as the basis for problems of contextual relevance in psychiatric education for primary care practitioners. There were few empirical studies; most reported only results of satisfaction surveys or simple tests of knowledge. Long-term outcomes were less positive; there were important negative findings. CONCLUSIONS An extensive literature published over five decades identified a strong need for ongoing mental health training for primary care physicians. Helpful recommendations exist related to objectives, methods, and evaluation. However, there are organizational and attitudinal issues that may be equally or more important for educators to consider than the selection of educational methods.
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Affiliation(s)
- B Hodges
- Department of Psychiatry, University of Toronto, Ontario, Canada.
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Mollanji R, Bozanovic-Sosic R, Silver I, Li B, Kim C, Midha R, Johnston M. Intracranial pressure accommodation is impaired by blocking pathways leading to extracranial lymphatics. Am J Physiol Regul Integr Comp Physiol 2001; 280:R1573-81. [PMID: 11294783 DOI: 10.1152/ajpregu.2001.280.5.r1573] [Citation(s) in RCA: 64] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Tracer studies indicate that cerebrospinal fluid (CSF) transport can occur through the cribriform plate into the nasal submucosa, where it is absorbed by cervical lymphatics. We tested the hypothesis that sealing the cribriform plate extracranially would impair the ability of the CSF pressure-regulating systems to compensate for volume infusions. Sheep were challenged with constant flow or constant pressure infusions of artificial CSF into the CSF compartment before and after the nasal mucosal side of the cribriform plate was sealed. With both infusion protocols, the intracranial pressure (ICP) vs. flow rate relationships were shifted significantly to the left when the cribriform plate was blocked. This indicated that obstruction of the cribriform plate reduced CSF clearance. Sham surgical procedures had no significant effects. Estimates of the proportional flow through cribriform and noncribriform routes suggested that cranial CSF absorption occurred primarily through the cribriform plate at low ICPs. Additional drainage sites (arachnoid villi or other lymphatic pathways) appeared to be recruited only when intracranial pressures were elevated. These data challenge the conventional view that CSF is absorbed principally via arachnoid villi and provide further support for the existence of several anatomically distinct cranial CSF transport pathways.
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Affiliation(s)
- R Mollanji
- Trauma Research Program, Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario M4N 3M5, Canada
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Abstract
Previous reports from our group demonstrated that about one-half of the total volume of cerebrospinal fluid (CSF) removed from the cranial vault in sheep is transported into extracranial lymphatics, especially cervical lymphatic vessels in the neck. In this study, we tested the hypothesis that an elevation of intracranial pressure (ICP) would increase cervical lymphatic pressure and lymph flow rates in anesthetized sheep. Catheters were inserted into both lateral ventricles, the cisterna magna, cervical lymphatics, and the jugular vein. A ventriculo-cisternal perfusion system was employed to regulate ICP. Mean (P = 0.008), peak (P = 0.007), and baseline (P = 0.013) cervical lymphatic pressures increased as ICP was elevated from 10 to 70 cmH2O in 20-cmH2O increments. Similarly, cervical lymph flow rates increased (P < 0.001), with flows at 70 cmH2O ICP observed to be approximately fourfold higher than those at 10 cmH2O ICP. No changes were observed in mesenteric lymph flow rates (vessels not expected to drain CSF). We conclude that cervical lymphatic vessels play an important role in the transport of CSF from the cranial vault when ICP is elevated.
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Affiliation(s)
- I Silver
- Trauma Research Program, Department of Laboratory Medicine and Pathobiology, Sunnybrook and Women's College Health Sciences Center, University of Toronto, Toronto, Ontario, Canada M4N 3M5
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Abstract
The goal of the present contribution is to discuss the relationships among brain oxygen tension, energy (ATP) level, and ion gradients and movements. The function of the CNS, the generation and transmission of impulses, is determined to a large extent by the movements of ions. Hence elucidation of these relationships is necessary to the understanding of how brain works. Moreover, such knowledge is indispensable for the design of rational therapies for treatment of a large group of pathological states caused by lack of oxygen. This paper is partly a review and partly an original contribution although the former involves to a considerable extent, results obtained in our laboratories. It is divided into 3 parts: a) a very brief general introduction which reminds the reader some well-known facts; b) presentation and discussion of data; and c) conclusions and/or predictions.
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Affiliation(s)
- I Silver
- Department of Anatomy, School of Veterinary Science, University of Bristol, United Kingdom
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Abstract
OBJECTIVE To evaluate the effectiveness of a multifaceted bicycle helmet promotion program for low income children attending preschool enrichment programs throughout Washington State. STUDY SAMPLE Preschool Head Start programs that conducted routine home visits among their enrolled families at least five times during the school year were eligible. Eighteen sites and 880 children met this criterion and were able and willing to carry out evaluation activities. Two hundred children were from control sites where no helmet promotion activities were carried out. INTERVENTION Classroom activities with children, education of parents during school meetings and home visits, fitting and distribution of helmets, a bicycle skills and safety "rodeo" event, and requiring children to wear helmets while riding on school grounds. EVALUATION METHODS Regularly scheduled home visits were used to observe helmet use of enrolled preschool children before and after the promotion program. Home visitors requested parental permission for enrolled children to ride, and then noted whether the child wore a helmet. RESULTS Helmet use in the intervention group more than doubled, from 43% to 89%, while use in the control group increased from 42% to 60% (p < 0.05 for intervention group changes v control group changes). CONCLUSIONS This multifaceted helmet promotion program successfully increased helmet use. Similar home visit protocols may be useful to evaluate the impact of other injury intervention programs.
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Affiliation(s)
- J Britt
- Harborview Injury Prevention and Research Center, Seattle, WA 98104-2499, USA
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Abstract
We applied the principles of cardiac mechanics to study the contraction cycles of postnodal sheep mesenteric lymphatic vessels in an in situ preparation. A segment of intestinal lymphatic was isolated from lymph input and provided with Krebs solution from a reservoir. Pressure-volume relationships were assessed under various transmural pressure conditions using videomicroscopic techniques to measure diameter changes and a miniature catheter pressure transducer to monitor intralymphangion pressure. The contraction cycles were quite variable but, on average, exhibited three phases of systole and three phases of diastole with periods of isovolumetric contraction and relaxation. Elevations of transmural pressure up to 4 cm H2O resulted in significant increases in stroke volume, ejection fraction, pulse pressure, and output/minute but not contraction frequency. Regression analysis of the end systolic (ESPVR) and end diastolic pressure-volume relations (EDPVR) revealed a linear ESPVR (r2 = 0.83 +/- 0.03) and exponential EDPVR (r2 = 0.83 +/- 0.02), a result that is similar to that observed in cardiac contraction cycles. Following a 25% whole blood volume bleed (a stimulus known to enhance lymphatic pumping), significant increases in stroke volume, ejection fraction, and output/minute were observed up to transmural pressures of 4 cm H2O. While an index used to assess cardiac contractility (end systolic elastance-Ees) was not observed to change after the bleed, a shift to the left of the end-systolic pressure-volume relations compared with the sham-bled group (significant shift of regression lines for ESPVR) suggested that hemorrhage exerted a positive inotropic effect on mesenteric lymphatics.
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Affiliation(s)
- B Li
- Department of Laboratory Medicine and Pathobiology, Sunnybrook Health Science Centre, University of Toronto, 2075 Bayview Avenue, Toronto, Ontario, M4N 3M5, Canada
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Mittmann N, Herrmann N, Shulman KI, Silver I, Shear N, Naranjo CA. Comparison of the Global Assessment of Functioning scale and the Montgomery-Asberg Depression Rating Scale in elderly depressed patients. Int J Geriatr Psychiatry 1998; 13:573-4. [PMID: 9733342 DOI: 10.1002/(sici)1099-1166(199808)13:8<573::aid-gps820>3.0.co;2-q] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Montcourrier P, Silver I, Farnoud R, Bird I, Rochefort H. Breast cancer cells have a high capacity to acidify extracellular milieu by a dual mechanism. Clin Exp Metastasis 1997; 15:382-92. [PMID: 9219726 DOI: 10.1023/a:1018446104071] [Citation(s) in RCA: 144] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The extracellular pH in malignant tumors is known to be lower than in normal tissues and may therefore facilitate extracellular activation of secreted lysosomal cathepsins. We have tested the capability of human mammary cells (continuous cell lines and primary culture) to acidify their extracellular environment, using two techniques. By measuring pH changes through alterations of phenolsulfone phthaleine absorbance, we found that the more aggressive MDA-MB-231 human breast cancer cells were more active in acidifying a non-buffered balanced salt solution than the estrogen receptor positive MCF7 and ZR75 cell lines and than normal mammary epithelial cells in primary culture. Metastatic breast cancer cells from pleural effusions were up to 200-fold more active in acidifying their extracellular milieu than non-malignant mammary cells cultured in the same conditions, strongly suggesting that this difference also occurs in vivo. The use of inhibitors in the presence or absence of glucose showed that both lactate and an ATP-driven proton pump sharing some characteristics of the vacuolar H+ pump were involved. Bafilomycin A1, a specific inhibitor of the vacuolar (V-type) ATP-H+ pump inhibited part of the acidification by MCF7 cells, but not by MDA-MB-231 cells. We also used microelectrodes to measure extracellular pH, in close contact to the MCF7 breast cancer cells. The pH at the free surface of MCF7 cells was lower by 0.33 +/- 0.14 unit than that of the surrounding medium, while insertion of the microelectrode tip beneath the attached surface of the cells showed a greater lowering of pH from 0.3 to 1.7 pH unit as long as cell attachment on the substrate prevented H+ diffusion. We conclude that breast carcinoma cells have a higher capacity for acidifying their extracellular milieu than normal mammary cells, and that both a plasma membrane H(+)-ATPase, and lactic acid production are involved in this acidification. It is therefore possible that the aspartyl and cysteinyl pro-cathepsins secreted in excess by tumor cells may be activated extracellularly in vivo close to the basement membrane.
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Affiliation(s)
- P Montcourrier
- Unité Hormones et Cancer (U 148) INSERM, Montpellier, France
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Rafi-Tari S, Kalant H, Liu JF, Silver I, Wu PH. Dizocilpine prevents the development of tolerance to ethanol-induced error on a circular maze test. Psychopharmacology (Berl) 1996; 125:23-32. [PMID: 8724445 DOI: 10.1007/bf02247389] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Dizocilpine [(+)MK-801] and ketamine, in doses that disrupt learning and memory, also prevent the development of tolerance to the motor impairing effects of ethanol (EtOH). However, dizocilpine itself affects motor behavior. In order to separate the possible influence of these two effects on the development of tolerance to EtOH, food-reinforced performance on a circular maze test was used in two different experiments. EtOH alone (1.2 g/kg) tended to increase the error score and reduce number of runs per trial, running speed, and total distance run, but on chronic administration of EtOH, tolerance developed progressively to all these effects. Dizocilpine also increased the error score, but had a biphasic effect on measures of running: low and intermediate doses (0.009 and 0.075 mg/kg, IP) increased running distance, whereas a high dose (0.15 mg/kg) decreased running speed and distance. When combined with EtOH, dizocilpine tended to overcome the effect of EtOH on running activity, but not on error score. Chronically, dizocilpine (0.075 and 0.15 mg/kg) prevented the development of tolerance to the effect of EtOH on error score, even though the lower dose of dizocilpine permitted tolerance to the effects of EtOH on running. These results suggest that NMDA receptor antagonists selectively inhibit tolerance to cognitive effects of ethanol even when the antagonists do not affect motor performance.
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Affiliation(s)
- S Rafi-Tari
- Department of Pharmacology, University of Toronto, Ontario, Canada
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Abstract
The 14 & 6 Hz positive spike phenomenon is generally considered a normal variant finding. Our experience prompted this re-evaluation, which consisted of three parts: In children referred for sleep electroencephalograms (EEGs), 100 children with normal EEG and 100 with 14 & 6--the 14 & 6 correlated with behavior disorder and aggression; In 75 children referred for neurological evaluation and EEG because of behavior problems, 52% had 14 & 6 (excluding those with paroxysmal EEGs); and In 57 symptomatic children having prominent 14 & 6, tabulation of symptoms yielded a complex but coherent clinical picture, including disturbances of temper, mood, attention, learning, and sleep. We conclude that 14 & 6 has clinical associations and deserves study.
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