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Sides TR, Nelson JC, Nwachukwu KN, Boston J, Marshall SA. The Influence of Arsenic Co-Exposure in a Model of Alcohol-Induced Neurodegeneration in C57BL/6J Mice. Brain Sci 2023; 13:1633. [PMID: 38137081 PMCID: PMC10741530 DOI: 10.3390/brainsci13121633] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Revised: 11/14/2023] [Accepted: 11/17/2023] [Indexed: 12/24/2023] Open
Abstract
Both excessive alcohol consumption and exposure to high levels of arsenic can lead to neurodegeneration, especially in the hippocampus. Co-exposure to arsenic and alcohol can occur because an individual with an Alcohol Use Disorder (AUD) is exposed to arsenic in their drinking water or food or because of arsenic found directly in alcoholic beverages. This study aims to determine if co-exposure to alcohol and arsenic leads to worse outcomes in neurodegeneration and associated mechanisms that could lead to cell death. To study this, mice were exposed to a 10-day gavage model of alcohol-induced neurodegeneration with varying doses of arsenic (0, 0.005, 2.5, or 10 mg/kg). The following were examined after the last dose of ethanol: (1) microglia activation assessed via immunohistochemical detection of Iba-1, (2) reactive oxygen and nitrogen species (ROS/RNS) using a colorimetric assay, (3) neurodegeneration using Fluoro-Jade® C staining (FJC), and 4) arsenic absorption using ICP-MS. After exposure, there was an additive effect of the highest dose of arsenic (10 mg/kg) in the dentate gyrus of alcohol-induced FJC+ cells. This additional cell loss may have been due to the observed increase in microglial reactivity or increased arsenic absorption following co-exposure to ethanol and arsenic. The data also showed that arsenic caused an increase in CYP2E1 expression and ROS/RNS production in the hippocampus which could have independently contributed to increased neurodegeneration. Altogether, these findings suggest a potential cyclical impact of co-exposure to arsenic and ethanol as ethanol increases arsenic absorption but arsenic also enhances alcohol's deleterious effects in the CNS.
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Affiliation(s)
- Tori R. Sides
- Department of Biological & Biomedical Sciences, North Carolina Central University, Durham, NC 27707, USA; (T.R.S.); (J.C.N.); (K.N.N.); (J.B.)
| | - James C. Nelson
- Department of Biological & Biomedical Sciences, North Carolina Central University, Durham, NC 27707, USA; (T.R.S.); (J.C.N.); (K.N.N.); (J.B.)
| | - Kala N. Nwachukwu
- Department of Biological & Biomedical Sciences, North Carolina Central University, Durham, NC 27707, USA; (T.R.S.); (J.C.N.); (K.N.N.); (J.B.)
- Integrated Biosciences PhD Program, North Carolina Central University, Durham, NC 27707, USA
| | - Jhana Boston
- Department of Biological & Biomedical Sciences, North Carolina Central University, Durham, NC 27707, USA; (T.R.S.); (J.C.N.); (K.N.N.); (J.B.)
| | - S. Alex Marshall
- Department of Biological & Biomedical Sciences, North Carolina Central University, Durham, NC 27707, USA; (T.R.S.); (J.C.N.); (K.N.N.); (J.B.)
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2
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Nwachukwu KN, Mohammed HE, Mebane DR, Barber AW, Swartzwelder HS, Marshall SA. Acute and Chronic Ethanol Effects during Adolescence on Neuroimmune Responses: Consequences and Potential Pharmacologic Interventions. Cells 2023; 12:1423. [PMID: 37408257 PMCID: PMC10217092 DOI: 10.3390/cells12101423] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Revised: 05/12/2023] [Accepted: 05/16/2023] [Indexed: 07/07/2023] Open
Abstract
Heavy ethanol consumption during adolescence has been linked to neuroimmune response dysregulation and cognitive deficits in the developing adolescent brain. During adolescence, the brain is particularly susceptible to the pharmacological effects of ethanol that are induced by acute and chronic bouts of exposure. Numerous preclinical rodent model studies have used different ethanol administration techniques, such as intragastric gavage, self-administration, vapor, intraperitoneal, and free access, and while most models indicated proinflammatory neuroimmune responses in the adolescent brain, there are various factors that appear to influence this observation. This review synthesizes the most recent findings of the effects of adolescent alcohol use on toll-like receptors, cytokines, and chemokines, as well as the activation of astrocytes and microglia with an emphasis on differences associated with the duration of ethanol exposure (acute vs. chronic), the amount of exposure (e.g., dose or blood ethanol concentrations), sex differences, and the timing of the neuroimmune observation (immediate vs. persistent). Finally, this review discusses new therapeutics and interventions that may ameliorate the dysregulation of neuroimmune maladaptations after ethanol exposure.
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Affiliation(s)
- Kala N. Nwachukwu
- Department of Biological & Biomedical Sciences, North Carolina Central University, Durham, NC 27707, USA
- Integrated Biosciences PhD Program, North Carolina Central University, Durham, NC 27707, USA
| | - Hassan E. Mohammed
- Department of Biological & Biomedical Sciences, North Carolina Central University, Durham, NC 27707, USA
| | - DaQuan R. Mebane
- Department of Biological & Biomedical Sciences, North Carolina Central University, Durham, NC 27707, USA
| | - Andrew W. Barber
- Department of Biological & Biomedical Sciences, North Carolina Central University, Durham, NC 27707, USA
| | - H. Scott Swartzwelder
- Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, NC 27708, USA
| | - S. Alex Marshall
- Department of Biological & Biomedical Sciences, North Carolina Central University, Durham, NC 27707, USA
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3
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Marshall SA, Robinson SL, Ebert SE, Companion MA, Thiele TE. Chemogenetic inhibition of corticotropin-releasing factor neurons in the central amygdala alters binge-like ethanol consumption in male mice. Behav Neurosci 2022; 136:541-550. [PMID: 35771510 PMCID: PMC9671851 DOI: 10.1037/bne0000522] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Repetitive bouts of binge drinking can lead to neuroplastic events that alter ethanol's pharmacologic effects and perpetuate excessive consumption. The corticotropin-releasing factor (CRF) system is an example of ethanol-induced neuroadaptations that drive excessive ethanol consumption. Our laboratory has previously shown that CRF antagonist, when infused into the central amygdala (CeA), reduces binge-like ethanol consumption. The present study extends this research by assessing the effects of silencing CRF-producing neurons in CeA on binge-like ethanol drinking stemming from "Drinking in the Dark" (DID) procedures. CRF-ires-Cre mice underwent surgery to infuse Gi/o-coupled Designer Receptors Exclusively Activated by Designer Drugs (DREADD) virus or a control virus into either the CeA or basolateral amygdala (BLA). Gi/o-DREADD-induced CRF-neuronal inhibition in the CeA resulted in a 33% decrease in binge-like ethanol consumption. However, no effect on ethanol consumption was seen after DREADD manipulation in the BLA. Moreover, CeA CRF-neuronal inhibition had no effect on sucrose consumption. The effects of silencing CRF neurons in the CeA on ethanol consumption are not secondary to changes in motor function or anxiety-like behaviors as assessed in the open-field test (OFT). Finally, the DREADD construct's functional ability to inhibit CRF-neuronal activity was demonstrated by reduced ethanol-induced c-Fos following DREADD activation. Together, these data suggest that the CRF neurons in the CeA play an important role in binge ethanol consumption and that inhibition of the CRF-signaling pathway remains a viable target for manipulating binge-like ethanol consumption. (PsycInfo Database Record (c) 2022 APA, all rights reserved).
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Affiliation(s)
- S. Alex Marshall
- Department of Psychology & Neuroscience, The University of North Carolina, Chapel Hill, NC 27599
- Biological & Biomedical Sciences Department, The University of North Carolina, Chapel Hill, NC 27599
| | - Stacey L. Robinson
- Department of Psychology & Neuroscience, The University of North Carolina, Chapel Hill, NC 27599
- Bowles Center for Alcohol Studies, The University of North Carolina, Chapel Hill, NC 27599
| | - Suzahn E. Ebert
- Department of Psychology & Neuroscience, The University of North Carolina, Chapel Hill, NC 27599
| | - Michel A. Companion
- Department of Psychology & Neuroscience, The University of North Carolina, Chapel Hill, NC 27599
- Bowles Center for Alcohol Studies, The University of North Carolina, Chapel Hill, NC 27599
| | - Todd E. Thiele
- Department of Psychology & Neuroscience, The University of North Carolina, Chapel Hill, NC 27599
- Bowles Center for Alcohol Studies, The University of North Carolina, Chapel Hill, NC 27599
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4
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Nwachukwu KN, Healey KL, Swartzwelder HS, Marshall SA. The Influence of Sex on Hippocampal Neurogenesis and Neurotrophic Responses on the Persistent Effects of Adolescent Intermittent Ethanol Exposure into Adulthood. Neuroscience 2022; 506:68-79. [PMID: 36343720 PMCID: PMC9764262 DOI: 10.1016/j.neuroscience.2022.10.028] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Revised: 10/24/2022] [Accepted: 10/31/2022] [Indexed: 11/06/2022]
Abstract
In the United States, approximately 90% of alcohol consumed by adolescents is binge drinking. Binge-like ethanol exposure during adolescence promotes dysregulation of neurotrophic responses and neurogenesis in the hippocampus. These effects include changes in proliferation, regulation, differentiation, and maturation of neurons, and there is indication that such effects may be disproportionate between sexes. This study determined whether sex impacts neurotrophic responses and neurogenesis in adulthood after adolescent intermittent ethanol (AIE) exposure. To determine this, adolescent rats underwent AIE with ethanol (5 g/kg). In adulthood, animals were euthanized, and immunohistochemical techniques and ELISAs were utilized to determine AIE effects on sex-specific neurogenesis factors and neurotrophic markers, respectively. AIE exposure led to a significant decrease in neurogenesis in the dentate gyrus of the hippocampal formation indicated by reductions in the numbers of DCX+, SOX2+ and Ki-67+ cells in male and female AIE-exposed rats. Additionally, AIE increased markers for the pro-inflammatory cytokines, TNF-α and IL-1β, in the hippocampus into adulthood in male AIE-exposed rats only. No significant AIE-induced differences were observed in the anti-inflammatory cytokines, IL-10 and TGF-β, nor in the neurotrophic factors BDNF and GDNF. Altogether, our findings indicate that although AIE did not have a persistent effect on hippocampal neurotrophic levels, there was still a reduction in neurogenesis. The neurogenic impairment was not sex specific, but the neurogenic deficits in males may be attributed to an increase in pro-inflammatory cytokine expression. A persistent impairment in neurogenesis may have an impact on both behavioral maladaptations and neurodegeneration in adulthood.
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Affiliation(s)
- Kala N Nwachukwu
- Department of Biological & Biomedical Sciences, North Carolina Central University, Durham, NC 27707, United States; Integrated Biosciences PhD Program, North Carolina Central University, Durham, NC 27707, USA
| | - Kati L Healey
- Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, NC 27708, United States
| | - H Scott Swartzwelder
- Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, NC 27708, United States
| | - S Alex Marshall
- Department of Biological & Biomedical Sciences, North Carolina Central University, Durham, NC 27707, United States.
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5
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Grillo W, Boateng CA, Brady LJ, Gaudier-Diaz MM, Mitchell KA, Ruffin VA, Tejdeda HA, Marshall SA. Reflections of six neuroscientists: The influences of training at minority serving institutions. J Neurosci Res 2022; 100:1529-1537. [PMID: 33527411 PMCID: PMC9942539 DOI: 10.1002/jnr.24796] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2020] [Accepted: 12/28/2020] [Indexed: 11/09/2022]
Affiliation(s)
- Wendy Grillo
- Department of Biological & Biomedical Sciences, North Carolina Central University, Durham, NC, USA
| | - Comfort A. Boateng
- Department of Basic Pharmaceutical Sciences, Fred Wilson School of Pharmacy, High Point University, NC, USA
| | - Lillian J. Brady
- Department of Pharmacology, Vanderbilt Center for Addiction Research, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - Monica M. Gaudier-Diaz
- Department of Psychology & Neuroscience, University of North Carolina-Chapel Hill, NC, USA
| | - Kerry-Ann Mitchell
- Department of Plastic & Reconstructive Surgery, The Ohio State University, Columbus, OH, USA
| | - Vernon A. Ruffin
- Department of Natural Sciences, Virginia Union University, Richmond, VA, USA
| | - Hugo A. Tejdeda
- Intramural Research Program, National Institute on Drug Abuse, US National Institutes of Health, Baltimore, MD, USA
| | - S. Alex Marshall
- Department of Biological & Biomedical Sciences, North Carolina Central University, Durham, NC, USA,Department of Psychology & Neuroscience, University of North Carolina-Chapel Hill, NC, USA
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6
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Cole GJ, Marshall SA. Highlighting the contributions of Minority Serving Institutions to neuroscience. J Neurosci Res 2022; 100:1527-1528. [PMID: 35591807 PMCID: PMC9543417 DOI: 10.1002/jnr.25064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2022] [Accepted: 04/30/2022] [Indexed: 11/06/2022]
Affiliation(s)
- Gregory J Cole
- Department of Biological and Biomedical Sciences, North Carolina Central University, Durham, North Carolina, USA.,Biomanufacturing Research Institute and Technology Enterprise, North Carolina Central University, Durham, North Carolina, USA
| | - S Alex Marshall
- Department of Biological and Biomedical Sciences, North Carolina Central University, Durham, North Carolina, USA
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7
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Nwachukwu KN, King DM, Healey KL, Swartzwelder HS, Marshall SA. Sex-specific effects of adolescent intermittent ethanol exposure-induced dysregulation of hippocampal glial cells in adulthood. Alcohol 2022; 100:31-39. [PMID: 35182671 PMCID: PMC8983575 DOI: 10.1016/j.alcohol.2022.02.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Revised: 02/07/2022] [Accepted: 02/10/2022] [Indexed: 12/11/2022]
Abstract
Adolescent alcohol abuse is a significant public health concern, with approximately 4.3 million U.S. adolescents reporting monthly binge drinking. Excessive ethanol consumption during adolescence has been linked to dysregulation of the neuroimmune system, particularly in the hippocampus. Because there are sex differences in both neuroimmune responses and ethanol's pharmacologic actions, this study tested whether there were disparate effects based on sex in glial cells and neurodegeneration in adulthood after the adolescent intermittent ethanol (AIE) model. Male and female adolescent Sprague-Dawley rats underwent AIE. In adulthood, immunohistochemical techniques were utilized to determine the effects of AIE on astrocytes and microglia, and Fluoro-Jade C (FJC) was used to assess neurodegeneration in the hippocampus. AIE exposure significantly increased astrocyte activation in the cornu ammonis 1 (CA1), CA2/3, and dentate gyrus (DG) in both male and female rats with no discernible sex differences in immunoreactivity. Likewise, the number of GFAP + cells was significantly increased by AIE across the hippocampus. In our microglial assessment, AIE only led to increased Iba1 immunoreactivity in the CA1 but not CA2/3 or DG regions. However, the number of Iba1+ cells was increased by AIE in both the CA1 and DG subregions. In the DG, the ethanol effect was observed in both sexes, but in the CA1, AIE-induced increased Iba1 cells were only observed in females. In regard to neurodegeneration, there were no persisting AIE effects on FJC + cells. These findings indicate that AIE alters hippocampal glial cells in adulthood, in the absence of active neurodegeneration. However, while AIE induced long-term elevation of astroglial measures in both males and females, persisting AIE-induced microglial activation was more sparse and sex-dependent. While the majority of these findings suggest that AIE has similar effects on glial morphology and number between males and females, additional work should determine whether there are molecular differences as well as innate sex differences in glial interaction with AIE's influence on glial functions in behavior.
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Affiliation(s)
- Kala N Nwachukwu
- Department of Biological & Biomedical Sciences, North Carolina Central University, Durham, NC, 27707, United States
| | - Dantae M King
- Department of Biological & Biomedical Sciences, North Carolina Central University, Durham, NC, 27707, United States
| | - Kati L Healey
- Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, NC, 27708, United States
| | - H Scott Swartzwelder
- Department of Psychiatry and Behavioral Sciences, Duke University Medical Center, Durham, NC, 27708, United States
| | - S Alex Marshall
- Department of Biological & Biomedical Sciences, North Carolina Central University, Durham, NC, 27707, United States.
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8
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Nelson JC, Greengrove E, Nwachukwu KN, Grifasi IR, Marshall SA. Repetitive binge-like consumption based on the Drinking-in-the-Dark model alters the microglial population in the mouse hippocampus. J Integr Neurosci 2021; 20:933-943. [PMID: 34997716 PMCID: PMC8982053 DOI: 10.31083/j.jin2004094] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Revised: 11/05/2021] [Accepted: 11/23/2021] [Indexed: 11/12/2022] Open
Abstract
Alcoholism causes various maladaptations in the central nervous system, including the neuroimmune system. Studies of alcohol-induced dysregulation of the neuroimmune system generally focus on alcohol dependence and brain damage, but our previous research indicates that repetitive binge-like consumption perturbs cytokines independent of cell death. This paper extends that research by examining the impact of binge-like consumption on microglia in the hippocampus and the amygdala. Microglia were assessed using immunohistochemistry following binge-like ethanol consumption based on Drinking-in-the-Dark model. Immunohistochemistry results showed that binge-like ethanol consumption caused an increase in Iba-1 immunoreactivity and the number of Iba-1+ cells after one Drinking-in-the-Dark cycle. However, after three Drinking-in-the-Darkcycles, the number of microglia decreased in the hippocampus. We showed that in the dentate gyrus, the average immunoreactivity/cell was increased following ethanol exposure despite the decrease in number after three cycles. Likewise, Ox-42, an indicator of microglia activation, was upregulated after ethanol consumption. No significant effects on microglia number or immunoreactivity (Iba-1 nor Ox-42) were observed in the amygdala. Finally, ethanol caused an increase in the expression of the microglial gene Aif-1 during intoxication and ten days into abstinence, suggesting persistence of ethanol-induced upregulation of microglial genes. Altogether, these findings indicate that repetitive binge-like ethanol is sufficient to elicit changes in microglial reactivity. This altered neuroimmune state may contribute to the development of alcohol use disorders.
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Affiliation(s)
- James C Nelson
- Department of Biological & Biomedical Sciences, North Carolina Central University, Durham, NC 27707, USA
| | - Eva Greengrove
- Department of Basic Pharmaceutical Sciences, Fred P. Wilson School of Pharmacy, High Point University, High Point, NC 27268, USA
| | - Kala N Nwachukwu
- Department of Biological & Biomedical Sciences, North Carolina Central University, Durham, NC 27707, USA
| | - Isabella R Grifasi
- Department of Basic Pharmaceutical Sciences, Fred P. Wilson School of Pharmacy, High Point University, High Point, NC 27268, USA
| | - S Alex Marshall
- Department of Biological & Biomedical Sciences, North Carolina Central University, Durham, NC 27707, USA.,Department of Basic Pharmaceutical Sciences, Fred P. Wilson School of Pharmacy, High Point University, High Point, NC 27268, USA
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9
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Marshall SA. Glial cells as influencers and maladaptive consequences of alcohol use disorders. J Neurosci Res 2021; 99:1905-1907. [PMID: 34062005 DOI: 10.1002/jnr.24868] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Accepted: 05/12/2021] [Indexed: 11/06/2022]
Affiliation(s)
- S Alex Marshall
- Department of Biological & Biomedical Sciences, North Carolina Central University, Durham, NC, USA.,Department of Psychology & Neuroscience, University of North Carolina-Chapel Hill, Chapel Hill, NC, USA
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10
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Nwachukwu KN, Evans WA, Sides TR, Trevisani CP, Davis A, Marshall SA. Chemogenetic manipulation of astrocytic signaling in the basolateral amygdala reduces binge-like alcohol consumption in male mice. J Neurosci Res 2021; 99:1957-1972. [PMID: 33844860 DOI: 10.1002/jnr.24841] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [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: 03/05/2021] [Accepted: 03/21/2021] [Indexed: 12/18/2022]
Abstract
Binge drinking is a common occurrence in the United States, but a high concentration of alcohol in the blood has been shown to have reinforcing and reciprocal effects on the neuroimmune system in both dependent and non-dependent scenarios. The first part of this study examined alcohol's effects on the astrocytic response in the central amygdala and basolateral amygdala (BLA) in a non-dependent model. C57BL/6J mice were given access to either ethanol, water, or sucrose during a "drinking in the dark" paradigm, and astrocyte number and astrogliosis were measured using immunohistochemistry. Results indicate that non-dependent consumption increased glial fibrillary acidic protein (GFAP) density but not the number of GFAP+ cells, suggesting that non-dependent ethanol is sufficient to elicit astrocyte activation. The second part of this study examined how astrocytes impacted behaviors and the neurochemistry related to alcohol using the chemogenetic tool, DREADDs (designer receptors exclusively activated by designer drugs). Transgenic GFAP-hM3Dq mice were administered clozapine N-oxide both peripherally, affecting the entire central nervous system (CNS), or directly into the BLA. In both instances, GFAP-Gq-signaling activation significantly reduced ethanol consumption and correlating blood ethanol concentrations. However, GFAP-Gq-DREADD activation throughout the CNS had more broad effects resulting in decreased locomotor activity and sucrose consumption. More targeted GFAP-Gq-signaling activation in the BLA only impacted ethanol consumption. Finally, a glutamate assay revealed that after GFAP-Gq-signaling activation glutamate concentrations in the amygdala were partially normalized to control levels. Altogether, these studies support the theory that astrocytes represent a viable target for alcohol use disorder therapies.
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Affiliation(s)
- Kala N Nwachukwu
- Department of Biological & Biomedical Sciences, North Carolina Central University, Durham, NC, USA
| | - William A Evans
- Department of Basic Pharmaceutical Sciences, Fred P. Wilson School of Pharmacy, High Point University, High Point, NC, USA
| | - Tori R Sides
- Department of Biological & Biomedical Sciences, North Carolina Central University, Durham, NC, USA
| | - Christopher P Trevisani
- Department of Basic Pharmaceutical Sciences, Fred P. Wilson School of Pharmacy, High Point University, High Point, NC, USA
| | - Ambryia Davis
- Department of Basic Pharmaceutical Sciences, Fred P. Wilson School of Pharmacy, High Point University, High Point, NC, USA
| | - S Alex Marshall
- Department of Biological & Biomedical Sciences, North Carolina Central University, Durham, NC, USA.,Department of Basic Pharmaceutical Sciences, Fred P. Wilson School of Pharmacy, High Point University, High Point, NC, USA.,Department of Psychology & Neuroscience, University of North Carolina-Chapel Hill, Chapel Hill, NC, USA
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11
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Langston-Cox AG, Anderson D, Creek DJ, Palmer KR, Marshall SA, Wallace EM. Sulforaphane Bioavailability and Effects on Blood Pressure in Women with Pregnancy Hypertension. Reprod Sci 2021; 28:1489-1497. [PMID: 33409874 DOI: 10.1007/s43032-020-00439-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [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: 06/23/2020] [Accepted: 12/13/2020] [Indexed: 12/18/2022]
Abstract
Sulforaphane, an isothiocyanate found in cruciferous vegetables such as broccoli, shows promise as an adjuvant therapy for preeclampsia. To inform future clinical trials, we set out to determine the bioavailability of sulforaphane in non-pregnant and preeclamptic women. In six healthy female volunteers, we performed a crossover trial to compare the bioavailability of sulforaphane and metabolites afforded by an activated and non-activated broccoli extract preparation. We then undertook a dose escalation study of the activated broccoli extract in 12 women with pregnancy hypertension. In non-pregnant women, an equivalent dose of activated broccoli extract gave higher levels of sulforaphane and metabolites than a non-activated extract (p < 0.0001) and greater area under the curve (AUC) (3559 nM vs. 2172 nM, p = 0.03). Compared to non-pregnant women, in women with preeclampsia, the same dose of activated extract gave lower levels of total metabolites (p < 0.000) and AUC (3559 nM vs. 1653 nM, p = 0.007). Doubling the dose of the activated extract in women with preeclampsia doubled levels of sulforaphane and metabolites (p = 0.02) and AUC (1653 nM vs. 3333 nM, p = 0.02). In women with preeclampsia, activated broccoli extract was associated with modest decreases in diastolic blood pressure (p = 0.05) and circulating levels of sFlt-1 (p = 0.0002). A myrosinase-activated sulforaphane formulation affords better sulforaphane bioavailability than a non-activated formulation. Higher doses of sulforaphane are required to achieve likely effective doses in pregnant women than in non-pregnant women. Sulforaphane may improve endothelial function and blood pressure in women with pregnancy hypertension.
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Affiliation(s)
- A G Langston-Cox
- The Ritchie Centre, Department of Obstetrics and Gynaecology, School of Clinical Sciences, Monash University, Level 5, Monash Medical Centre, 246 Clayton Road, Clayton, Victoria, 3168, Australia
| | - D Anderson
- Monash Proteomics and Metabolomics Facility, Drug Delivery Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, VIC, Australia
| | - D J Creek
- Monash Proteomics and Metabolomics Facility, Drug Delivery Disposition and Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, VIC, Australia
| | - K R Palmer
- The Ritchie Centre, Department of Obstetrics and Gynaecology, School of Clinical Sciences, Monash University, Level 5, Monash Medical Centre, 246 Clayton Road, Clayton, Victoria, 3168, Australia
| | - S A Marshall
- The Ritchie Centre, Department of Obstetrics and Gynaecology, School of Clinical Sciences, Monash University, Level 5, Monash Medical Centre, 246 Clayton Road, Clayton, Victoria, 3168, Australia
| | - E M Wallace
- The Ritchie Centre, Department of Obstetrics and Gynaecology, School of Clinical Sciences, Monash University, Level 5, Monash Medical Centre, 246 Clayton Road, Clayton, Victoria, 3168, Australia.
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12
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Langston-Cox A, Leo CH, Tare M, Wallace EM, Marshall SA. Sulforaphane improves vascular reactivity in mouse and human arteries after "preeclamptic-like" injury. Placenta 2020; 101:242-250. [PMID: 33032098 DOI: 10.1016/j.placenta.2020.09.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 08/16/2020] [Accepted: 09/01/2020] [Indexed: 02/08/2023]
Abstract
INTRODUCTION The widespread maternal endothelial dysfunction that underlies the manifestations of preeclampsia is thought to arise from excessive placental production of antiangiogenic factors and enhanced oxidative stress. Therefore, we assessed whether the natural antioxidant sulforaphane could improve vascular function. METHODS Cell viability of human umbilical vein endothelial cells (HUVECs) was assessed after 24 or 48 h in normoxia (20% O2) or hypoxia (1% O2) with or without sulforaphane. To model vascular dysfunction associated with preeclampsia, mouse mesenteric arteries were incubated in trophoblast conditioned media (TCM), and human omental arteries incubated in preeclamptic explant media (PEM) with or without sulforaphane. Both media are rich in antiangiogenic compounds associated with preeclampsia. TCM was generated from primary cytotrophoblast cells from term placentae of normotensive, while PEM was generated from explants from preeclamptic women. Reactivity was assessed by wire myography. sulforaphane's actions as a vasodilator were also investigated. RESULTS Under conditions of hypoxia, sulforaphane improved HUVEC viability. In mouse mesenteric arteries, sulforaphane reduced contraction evoked by potassium (p < 0.001), phenylephrine and endothelin 1 (all p < 0.001). Sulforaphane also inhibited Ca2+-induced contraction (p = 0.014). Sulforaphane prevented TCM-induced augmentation of phenylephrine and angiotensin II-mediated contraction of mouse mesenteric arteries. In human omental arteries, sulforaphane induced vasodilation (p < 0.001), and prevented PEM-induced endothelial dysfunction by restoring arterial sensitivity to the endothelium-dependent vasodilator bradykinin (p = 0.008). DISCUSSION Sulforaphane causes relaxation in arteries and protects against arterial dysfunction induced by placental-derived antiangiogenic factors, which are known to contribute to the preeclampsia.
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Affiliation(s)
- A Langston-Cox
- The Ritchie Centre, Department of Obstetrics and Gynaecology, School of Clinical Sciences, Monash University, Clayton, Victoria, Australia
| | - C H Leo
- Science, Mathematics and Technology, Singapore University of Technology & Design, Singapore
| | - M Tare
- Monash Rural Health, Monash University, Churchill, VIC, 3842, Australia; Department of Physiology, Monash University, Clayton, Australia
| | - E M Wallace
- The Ritchie Centre, Department of Obstetrics and Gynaecology, School of Clinical Sciences, Monash University, Clayton, Victoria, Australia
| | - S A Marshall
- The Ritchie Centre, Department of Obstetrics and Gynaecology, School of Clinical Sciences, Monash University, Clayton, Victoria, Australia.
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Langston-Cox A, Muccini AM, Marshall SA, Yap Y, Palmer KR, Wallace EM, Ellery SJ. Corrigendum to "Sulforaphane improves syncytiotrophoblast mitochondrial function after in vitro hypoxic and superoxide injury" [Placenta 96 (2020) 44-54]. Placenta 2020; 101:261. [PMID: 32843242 DOI: 10.1016/j.placenta.2020.08.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- A Langston-Cox
- The Ritchie Centre, Department of Obstetrics and Gynaecology, Monash University, Clayton, VIC, Australia.
| | - A M Muccini
- The Ritchie Centre, Department of Obstetrics and Gynaecology, Monash University, Clayton, VIC, Australia; Hudson Institute of Medical Research, Clayton, VIC, Australia
| | - S A Marshall
- The Ritchie Centre, Department of Obstetrics and Gynaecology, Monash University, Clayton, VIC, Australia
| | - Y Yap
- The Ritchie Centre, Department of Obstetrics and Gynaecology, Monash University, Clayton, VIC, Australia; Hudson Institute of Medical Research, Clayton, VIC, Australia
| | - K R Palmer
- The Ritchie Centre, Department of Obstetrics and Gynaecology, Monash University, Clayton, VIC, Australia; Monash Women's, Monash Health, Clayton, VIC, Australia
| | - E M Wallace
- The Ritchie Centre, Department of Obstetrics and Gynaecology, Monash University, Clayton, VIC, Australia
| | - S J Ellery
- The Ritchie Centre, Department of Obstetrics and Gynaecology, Monash University, Clayton, VIC, Australia; Hudson Institute of Medical Research, Clayton, VIC, Australia
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Marshall SA, McClain JA, Wooden JI, Nixon K. Microglia Dystrophy Following Binge-Like Alcohol Exposure in Adolescent and Adult Male Rats. Front Neuroanat 2020; 14:52. [PMID: 32903737 PMCID: PMC7439004 DOI: 10.3389/fnana.2020.00052] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Accepted: 07/20/2020] [Indexed: 12/13/2022] Open
Abstract
Microglia are dynamic cells that have roles in neuronal plasticity as well as in recovery responses following neuronal injury. Although many hypothesize that hyperactivation of microglia contributes to alcohol-induced neuropathology, in other neurodegenerative conditions disruption of normal microglial processes also contributes to neuronal loss, particularly as microglia become dystrophic or dysfunctional. Based on the observation of a striking, abnormal morphology in microglia during binge-like ethanol exposure, the present study investigated the impact of excessive ethanol exposure on microglia number and dystrophic morphology in a model of alcohol dependence that includes neurodegeneration in both adult and adolescent rats. Following 2- and 4-day binge ethanol exposure, the number of microglia was decreased in the hippocampus and the perirhinal and entorhinal cortices of both adult and adolescent rats. Furthermore, a significant number of microglia with a dystrophic morphology were observed in ethanol-exposed tissue, accompanied by a significant decrease in brain-derived neurotrophic factor (BDNF) expression in the hippocampus. Together these findings suggest another means by which microglia may contribute to alcohol-induced neurodegeneration, specifically dystrophic microglia and/or loss of microglia may disrupt homeostatic and recovery mechanisms. These results demonstrate that microglia also degenerate with excessive alcohol exposure, which has important implications for understanding the role of microglia-and specifically their contributions to plasticity and neuronal survival-in neurodegenerative disease.
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Affiliation(s)
- S Alex Marshall
- Department of Pharmaceutical Sciences, University of Kentucky, Lexington, KY, United States
| | - Justin A McClain
- Department of Pharmaceutical Sciences, University of Kentucky, Lexington, KY, United States
| | - Jessica I Wooden
- Division of Pharmacology & Toxicology, College of Pharmacy, The University of Texas, Austin, TX, United States
| | - Kimberly Nixon
- Department of Pharmaceutical Sciences, University of Kentucky, Lexington, KY, United States.,Division of Pharmacology & Toxicology, College of Pharmacy, The University of Texas, Austin, TX, United States
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Langston-Cox A, Muccini AM, Marshall SA, Yap, Palmer KR, Wallace EM, Ellery SJ. Sulforaphane improves syncytiotrophoblast mitochondrial function after in vitro hypoxic and superoxide injury. Placenta 2020; 96:44-54. [PMID: 32560857 DOI: 10.1016/j.placenta.2020.05.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Revised: 04/22/2020] [Accepted: 05/10/2020] [Indexed: 01/01/2023]
Abstract
INTRODUCTION Placental mitochondrial dysfunction contributes to the oxidative stress that underlies preeclampsia. Here, we assessed whether sulforaphane (SFN) could improve syncytiotrophoblast mitochondrial function after in vitro hypoxic and superoxide injury. METHODS Placental cytotrophoblasts were isolated from healthy term placentae (n = 12) and incubated for 48 h in 8% O2 ± 1 μM SFN before acute (4hrs) or chronic (24hrs) hypoxic (1% O2), or superoxide (xanthine/xanthine oxidase) injury. Cytotrophoblasts were also isolated from preeclamptic placentae (n = 5) and cultured in 8% O2 ± 1 μM SFN. Mitochondrial respiration was measured using the Seahorse MitoStress XF assay. Cells were stained with mitotracker red to assess mitochondrial membrane health and mitochondrial gene expression assessed using RT-qPCR. RESULTS SFN prevented significant reductions in syncytiotrophoblast mitochondrial maximal respiration, spare respiratory capacity, basal respiration and ATP production following acute hypoxia. Chronic hypoxia only reduced maximal and spare respiratory capacity. SFN prevented these negative changes and increased respiration overall. Alternatively, acute superoxide injury significantly increased mitochondrial maximal respiration and spare respiratory capacity. SFN treatment further increased basal respiration following superoxide injury and prevented significant decreases in ATP production and coupling efficiency. In preeclamptic placentae, SFN significantly increased mitochondrial maximal respiration, spare respiratory capacity, basal respiration and ATP production, and decreased proton leak. SFN up-regulated mRNA expression of mitochondrial complexes and corrected an up-regulation in fission gene expression observed after hypoxic-superoxide injury. Finally, preliminary results suggest SFN prevented hypoxia-induced impairment of mitochondrial membrane structure. DISCUSSION SFN mitigated hypoxia and superoxide induced changes to syncytiotrophoblast mitochondrial function in vitro, and improved mitochondrial respiration in trophoblast cells from preeclamptic placentae.
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Affiliation(s)
- A Langston-Cox
- The Ritchie Centre, Department of Obstetrics and Gynaecology, Monash University, Clayton, VIC, Australia.
| | - A M Muccini
- The Ritchie Centre, Department of Obstetrics and Gynaecology, Monash University, Clayton, VIC, Australia; Hudson Institute of Medical Research, Clayton, VIC, Australia
| | - S A Marshall
- The Ritchie Centre, Department of Obstetrics and Gynaecology, Monash University, Clayton, VIC, Australia
| | - Yap
- The Ritchie Centre, Department of Obstetrics and Gynaecology, Monash University, Clayton, VIC, Australia; Hudson Institute of Medical Research, Clayton, VIC, Australia
| | - K R Palmer
- The Ritchie Centre, Department of Obstetrics and Gynaecology, Monash University, Clayton, VIC, Australia; Monash Women's, Monash Health, Clayton, VIC, Australia
| | - E M Wallace
- The Ritchie Centre, Department of Obstetrics and Gynaecology, Monash University, Clayton, VIC, Australia
| | - S J Ellery
- The Ritchie Centre, Department of Obstetrics and Gynaecology, Monash University, Clayton, VIC, Australia; Hudson Institute of Medical Research, Clayton, VIC, Australia
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Marshall SA. Micropezidae (Diptera, Nerioidea) of Mauritius, with a description of Paraeurybata new genus. Zootaxa 2019; 4624:zootaxa.4624.4.8. [PMID: 31716202 DOI: 10.11646/zootaxa.4624.4.8] [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: 07/01/2019] [Indexed: 11/04/2022]
Abstract
The Micropezidae species of Mauritius are reviewed on the basis of recent collections. Mimegralla splendens (Wiedemann 1830) is newly recorded from Mauritius and the new genus Paraeurybata is described for Calobata taeniata Macquart 1851. A third species, Courtoisia apicalis (Macquart 1851), remains known only from the type specimen collected in Réunion and from a single specimen collected in Mauritius in 1963.
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Affiliation(s)
- S A Marshall
- School of Environmental Sciences, University of Guelph, Guelph, Ontario, Canada N1G 2W1..
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Kuprys PV, Tsukamoto H, Gao B, Jia L, McGowan J, Coopersmith CM, Moreno MC, Hulsebus H, Meena AS, Souza-Smith FM, Roper P, Foster MT, Raju SV, Marshall SA, Fujita M, Curtis BJ, Wyatt TA, Mandrekar P, Kovacs EJ, Choudhry MA. Summary of the 2018 Alcohol and Immunology Research Interest Group (AIRIG) meeting. Alcohol 2019; 77:11-18. [PMID: 30763905 PMCID: PMC6733262 DOI: 10.1016/j.alcohol.2018.08.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [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: 07/18/2018] [Revised: 08/20/2018] [Accepted: 08/20/2018] [Indexed: 02/08/2023]
Abstract
On January 26, 2018, the 23rd annual Alcohol and Immunology Research Interest Group (AIRIG) meeting was held at the University of Colorado Denver, Anschutz Medical Campus, Aurora, Colorado. The meeting consisted of plenary sessions with oral presentations and a poster presentation session. There were four plenary sessions that covered a wide range of topics relating to alcohol use: Alcohol and Liver Disease; Alcohol, Inflammation and Immune Response; Alcohol and Organ Injury; Heath Consequences and Alcohol Drinking. The meeting provided a forum for the presentation and discussion of novel research findings regarding alcohol use and immunology.
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Affiliation(s)
- Paulius V. Kuprys
- Department of Surgery, Alcohol Research Program, Burn & Shock Trauma Research Institute, Loyola University Chicago Health Sciences Division, Maywood, IL, United States
| | - Hidekazu Tsukamoto
- Southern California Research Center for ALPD, Cirrhosis and Department of Pathology, University of Southern California, Greater Los Angeles Veterans Affairs Health Care System, Los Angeles, CA, United States
| | - Bin Gao
- National Institute on Alcohol Abuse and Alcoholism, Bethesda, MD, United States
| | - Lin Jia
- Department of Internal Medicine, Division of Hypothalamic Research, University of Texas Southwestern Medical Center at Dallas, Dallas, TX, United States
| | - Jacob McGowan
- Department of Environmental, Agricultural and Occupational Health, University of Nebraska Medical Center, Veterans Affairs Nebraska-Western Iowa Health Care System, Omaha, NE, United States
| | | | - Maria Camargo Moreno
- Department of Surgery, Alcohol Research Program, Burn & Shock Trauma Research Institute, Loyola University Chicago Health Sciences Division, Maywood, IL, United States
| | - Holly Hulsebus
- Alcohol Research Program, Burn Research Program, Division of GI, Trauma and Endocrine Surgery, Department of Surgery, University of Colorado Denver, Anschutz Medical Campus, Aurora, CO, United States
| | - Avtar S. Meena
- Department of Physiology, University of Tennessee Health Science Center, Memphis, TN, United States
| | - Flavia M. Souza-Smith
- Department of Physiology, Louisiana State University Health Sciences Center, New Orleans, LA, United States
| | - Philip Roper
- Department of Surgery, Alcohol Research Program, Burn & Shock Trauma Research Institute, Loyola University Chicago Health Sciences Division, Maywood, IL, United States
| | - Michelle T. Foster
- Department of Food Science and Human Nutrition, Colorado State University, Fort Collins, CO, United States
| | - S. Vamsee Raju
- Department of Medicine, University of Alabama at Birmingham, Birmingham, AL, United States
| | - S. Alex Marshall
- Department of Basic Pharmaceutical Sciences, High Point University Fred Wilson School of Pharmacy, High Point, NC, United States
| | - Mayumi Fujita
- Department of Dermatology, University of Colorado Denver, Anschutz Medical Campus, Aurora, CO, United States
| | - Brenda J. Curtis
- Alcohol Research Program, Burn Research Program, Division of GI, Trauma and Endocrine Surgery, Department of Surgery, University of Colorado Denver, Anschutz Medical Campus, Aurora, CO, United States
| | - Todd A. Wyatt
- Department of Environmental, Agricultural and Occupational Health, University of Nebraska Medical Center, Veterans Affairs Nebraska-Western Iowa Health Care System, Omaha, NE, United States
| | - Pranoti Mandrekar
- Department of Medicine, University of Massachusetts Medical School, Worcester, MA, United States
| | - Elizabeth J. Kovacs
- Alcohol Research Program, Burn Research Program, Division of GI, Trauma and Endocrine Surgery, Department of Surgery, University of Colorado Denver, Anschutz Medical Campus, Aurora, CO, United States
| | - Mashkoor A. Choudhry
- Department of Surgery, Alcohol Research Program, Burn & Shock Trauma Research Institute, Loyola University Chicago Health Sciences Division, Maywood, IL, United States,Corresponding author. Alcohol Research Program, Burn & Shock Trauma, Research Institute, Loyola University Chicago Health Sciences Division, 2160 South, First Ave., Maywood, IL 60153, United States. Fax: +1 708 327 2813. (M.A. Choudhry)
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Grifasi IR, McIntosh SE, Thomas RD, Lysle DT, Thiele TE, Marshall SA. Characterization of the Hippocampal Neuroimmune Response to Binge-Like Ethanol Consumption in the Drinking in the Dark Model. Neuroimmunomodulation 2019; 26:19-32. [PMID: 30625475 PMCID: PMC6389401 DOI: 10.1159/000495210] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Accepted: 11/08/2018] [Indexed: 12/30/2022] Open
Abstract
OBJECTIVES Alcohol dependence leads to dysregulation of the neuroimmune system, but the effects of excessive alcohol consumption on key players of the neuroimmune response after episodic binge drinking in nondependence has not been readily assessed. These studies seek to determine how the neuroimmune system within the hippocampus responds to binge-like consumption prior to dependence or evidence of brain damage. METHODS C57BL/6J mice underwent the drinking in the dark (DID) paradigm to recapitulate binge consumption. Immunohistochemical techniques were employed to determine the effects of ethanol on cytokine and astrocyte responses within the hippocampus. Astrocyte activation was also assessed using qRT-PCR. RESULTS Our results indicated that binge-like ethanol consumption resulted in a 3.6-fold increase in the proinflammatory cytokine interleukin (IL)-1β immunoreactivity in various regions of the hippocampus. The opposite effect was seen in the anti-inflammatory cytokine IL-10. Binge-like consumption resulted in a 67% decrease in IL-10 immunoreactivity but had no effect on IL-4 or IL-6 compared with the water-drinking control group. Moreover, astrocyte activation occurred following ethanol exposure as GFAP immunoreactivity was increased over 120% in mice that experienced 3 cycles of ethanol binges. PCR analyses indicated that the mRNA increased by almost 4-fold after one cycle of DID, but this effect did not persist in abstinence. CONCLUSIONS Altogether, these findings suggest that binge-like ethanol drinking prior to dependence causes dysregulation to the neuroimmune system. This altered neuroimmune state may have an impact on behavior but could also result in a heightened neuroimmune response that is exacerbated from further ethanol exposure or other immune-modulating events.
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Affiliation(s)
- Isabella R Grifasi
- Department of Basic Pharmaceutical Sciences, Fred P. Wilson School of Pharmacy, High Point University, High Point, North Carolina, USA
| | - Scot E McIntosh
- Department of Basic Pharmaceutical Sciences, Fred P. Wilson School of Pharmacy, High Point University, High Point, North Carolina, USA
| | - Rhiannon D Thomas
- Department of Psychology and Neuroscience, The University of North Carolina, Chapel Hill, North Carolina, USA
| | - Donald T Lysle
- Department of Psychology and Neuroscience, The University of North Carolina, Chapel Hill, North Carolina, USA
- Bowles Center for Alcohol Studies, The University of North Carolina, Chapel Hill, North Carolina, USA
| | - Todd E Thiele
- Department of Psychology and Neuroscience, The University of North Carolina, Chapel Hill, North Carolina, USA
- Bowles Center for Alcohol Studies, The University of North Carolina, Chapel Hill, North Carolina, USA
| | - S Alex Marshall
- Department of Basic Pharmaceutical Sciences, Fred P. Wilson School of Pharmacy, High Point University, High Point, North Carolina, USA,
- Department of Psychology and Neuroscience, The University of North Carolina, Chapel Hill, North Carolina, USA,
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Olney JJ, Marshall SA, Thiele TE. Assessment of depression-like behavior and anhedonia after repeated cycles of binge-like ethanol drinking in male C57BL/6J mice. Pharmacol Biochem Behav 2018; 168:1-7. [PMID: 29550387 DOI: 10.1016/j.pbb.2018.03.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Revised: 02/22/2018] [Accepted: 03/14/2018] [Indexed: 12/17/2022]
Abstract
Psychological depression is frequently linked to alcohol abuse and even serves as key indicators of an alcohol use disorder (AUD). This relationship is supported by preclinical findings in which depression-like phenotypes develop in animals exposed to chronic intermittent ethanol vapor, a common preclinical model of alcohol dependence. However, the emergence of these maladaptive phenotypes following repeated binge-like ethanol drinking remains relatively unexplored. The purpose of this study was to evaluate depression-like behaviors associated with binge-like consumption in mice. Using the drinking-in-the-dark (DID) paradigm, we examined the impact of multiple binge-like cycles (1, 3, or 6) on depression-like behaviors in the forced swim test (FST) and sucrose preference as a test for anhedonia. We also assessed the effect of repeated binge cycles on the consumption of bitter and sweet tastants over a range of concentrations. Results indicated that binge-like ethanol drinking did not lead to depression-like behavior as repeated cycles of DID did not alter sucrose consumption or preference nor did it impact time spent immobile during the FST. Animals that experienced six cycles of DID showed increased quinine consumption and increased quinine preference, which may be indicative of an escalated preference for tastants that resemble the gustatory aspects of ethanol. Interestingly, an unexpected ~20% increase in hypermobility was observed after three cycles of binge-like ethanol drinking. Although the FST is most frequently used to model depression-like behavior, emerging evidence suggests that increased hypermobility during the FST could be indicative of an inability to cope in a stressful situation, suggesting that repeated ethanol exposure in the present experiment transiently enhances stress reactivity.
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Affiliation(s)
- Jeffrey J Olney
- Department of Psychology & Neuroscience, University of North Carolina, Chapel Hill, NC, USA; Bowles Center for Alcohol Studies, University of North Carolina, Chapel Hill, NC, USA
| | - S Alex Marshall
- Department of Psychology & Neuroscience, University of North Carolina, Chapel Hill, NC, USA; Fred P. Wilson School of Pharmacy, High Point University, High Point, NC, USA
| | - Todd E Thiele
- Department of Psychology & Neuroscience, University of North Carolina, Chapel Hill, NC, USA; Bowles Center for Alcohol Studies, University of North Carolina, Chapel Hill, NC, USA.
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Leo CH, Jelinic M, Ng HH, Marshall SA, Novak J, Tare M, Conrad KP, Parry LJ. Vascular actions of relaxin: nitric oxide and beyond. Br J Pharmacol 2016; 174:1002-1014. [PMID: 27590257 DOI: 10.1111/bph.13614] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2016] [Revised: 08/24/2016] [Accepted: 08/29/2016] [Indexed: 12/28/2022] Open
Abstract
The peptide hormone relaxin regulates the essential maternal haemodynamic adaptations in early pregnancy through direct actions on the renal and systemic vasculature. These vascular actions of relaxin occur mainly through endothelium-derived NO-mediated vasodilator pathways and improvements in arterial compliance in small resistance-size arteries. This work catalysed a plethora of studies which revealed quite heterogeneous responses across the different regions of the vasculature, and also uncovered NO-independent mechanisms of relaxin action. In this review, we first describe the role of endogenous relaxin in maintaining normal vascular function, largely referring to work in pregnant and male relaxin-deficient animals. We then discuss the diversity of mechanisms mediating relaxin action in different vascular beds, including the involvement of prostanoids, VEGF, endothelium-derived hyperpolarisation and antioxidant activity in addition to the classic NO-mediated vasodilatory pathway. We conclude the review with current perspectives on the vascular remodelling capabilities of relaxin. LINKED ARTICLES This article is part of a themed section on Recent Progress in the Understanding of Relaxin Family Peptides and their Receptors. To view the other articles in this section visit http://onlinelibrary.wiley.com/doi/10.1111/bph.v174.10/issuetoc.
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Affiliation(s)
- C H Leo
- School of BioSciences, The University of Melbourne, Parkville, VIC, Australia
| | - M Jelinic
- School of BioSciences, The University of Melbourne, Parkville, VIC, Australia
| | - H H Ng
- School of BioSciences, The University of Melbourne, Parkville, VIC, Australia
| | - S A Marshall
- School of BioSciences, The University of Melbourne, Parkville, VIC, Australia
| | - J Novak
- Division of Mathematics and Science, Walsh University, North Canton, OH, USA
| | - M Tare
- Department of Physiology, Monash University, Clayton, VIC, Australia.,School of Rural Health, Monash University, Clayton, VIC, Australia
| | - K P Conrad
- Department of Physiology and Functional Genomics, Department of Obstetrics and Gynaecology, College of Medicine, University of Florida, Gainesville, FL, USA
| | - L J Parry
- School of BioSciences, The University of Melbourne, Parkville, VIC, Australia
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Abstract
The previously monotypic genus Pseudeurybata Hennig is revised to include seven species from Central America and Mexico and one species from South America. Pseudeurybata rufilabris (Enderlein) and Pseudeurybata compeditus (Hennig) are given as new combinations and a lectotype is designated for P. rufilabris (Enderlein). Pseudeurybata browni and P. alces from Costa Rica, P. guatemalensis from Guatemala, P. dasypogon from Mexico, and P. zeta from Colombia and Ecuador are described as new. All species are keyed and illustrated.
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Affiliation(s)
- S A Marshall
- School of Environmental Sciences, University of Guelph, Guelph, Ontario, Canada; unknown
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Abstract
The family Nothybidae (Diptera: Schizophora) is revised. The family consists of 11 species in the single genus Nothybus Rondani, which occurs in Papua New Guinea, Nepal and much of the Oriental Region. Three species are described as new: N. absens spec. nov. (China), N. cataractus spec. nov. (Laos, Thailand) and N. procerus spec. nov. (India). Nothybus longithorax Rondani, 1875 is treated as a junior synonym of N. longicollis (Walker, 1856). Nothybus decorus Meijere, 1924 syn. nov. is included as a junior synonym of N. lineifer Enderlein, 1922.
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Affiliation(s)
- O Lonsdale
- Agriculture and Agri-Food Canada, 960 Carling Avenue, Ottawa, K1A 0C6, Ontario, Canada.;
| | - S A Marshall
- Insect Systematics Lab, School of Environmental Sciences, University of Guelph,, Guelph, N1G 2W1, Ontario, Canada.;
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Marshall SA, Casachahua JD, Rinker JA, Blose AK, Lysle DT, Thiele TE. IL-1 receptor signaling in the basolateral amygdala modulates binge-like ethanol consumption in male C57BL/6J mice. Brain Behav Immun 2016; 51:258-267. [PMID: 26365025 PMCID: PMC4679505 DOI: 10.1016/j.bbi.2015.09.006] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/14/2015] [Revised: 08/26/2015] [Accepted: 09/09/2015] [Indexed: 12/26/2022] Open
Abstract
Proinflammatory cytokines have been implicated in alcohol-induced neurodegeneration, but the role of the neuroimmune system in alcohol related behaviors has only recently come to the forefront. Herein, the effects of binge-like drinking on IL-1β mRNA and immunoreactivity within the amygdala were measured following the "drinking in the dark" (DID) paradigm, a model of binge-like ethanol drinking in C57BL/6J mice. Moreover, the role of IL-1 receptor signaling in the amygdala on ethanol consumption was assessed. Results indicated that a history of binge-like ethanol drinking promoted a significant increase of IL-1β mRNA expression within the amygdala, and immunohistochemistry analyses revealed that the basolateral amygdala (BLA), but not central amygdala (CeA), exhibited significantly increased IL-1β immunoreactivity. However, Fluoro-Jade® C labeling indicated that multiple cycles of the DID paradigm were not sufficient to elicit neuronal death. Bilateral infusions of IL-1 receptor antagonist (IL-1Ra) reduced ethanol consumption when infused into the BLA but not the CeA. These observations were specific to ethanol drinking as the IL-1Ra did not alter either sucrose drinking or open-field locomotor activity. The current findings highlight a specific role for IL-1 receptor signaling in modulating binge-like ethanol consumption and indicate that proinflammatory cytokines can be induced prior to dependence or any evidence of neuronal cell death. These findings provide a framework in which to understand how neuroimmune adaptations may alter ethanol consumption and therein contribute to alcohol abuse.
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Affiliation(s)
- S. Alex Marshall
- Department of Psychology & Neuroscience, The University of North Carolina, Chapel Hill, NC 27599,Bowles Center for Alcohol Studies; The University of North Carolina, Chapel Hill, NC 27599
| | - John D. Casachahua
- Department of Psychology & Neuroscience, The University of North Carolina, Chapel Hill, NC 27599,Bowles Center for Alcohol Studies; The University of North Carolina, Chapel Hill, NC 27599
| | - Jennifer A. Rinker
- Department of Psychology & Neuroscience, The University of North Carolina, Chapel Hill, NC 27599,Bowles Center for Alcohol Studies; The University of North Carolina, Chapel Hill, NC 27599
| | - Allyson K. Blose
- Department of Psychology & Neuroscience, The University of North Carolina, Chapel Hill, NC 27599
| | - Donald T. Lysle
- Department of Psychology & Neuroscience, The University of North Carolina, Chapel Hill, NC 27599,Bowles Center for Alcohol Studies; The University of North Carolina, Chapel Hill, NC 27599
| | - Todd E. Thiele
- Department of Psychology & Neuroscience, The University of North Carolina, Chapel Hill, NC 27599,Bowles Center for Alcohol Studies; The University of North Carolina, Chapel Hill, NC 27599
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24
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Abstract
Mesoconius Enderlein, including Zelatractodes Enderlein new synonym, is revised for Central America with one described species (Mesoconius hemithorax Frey) and five new species (M. bicolor, M. dianthus, M. nigrihumeralis, M. tigrinus, and M. zadbi). The relatively large species of this entirely Neotropical genus, most of which are restricted to narrow high elevation ranges, lack the male genital fork that characterizes all other Taeniapterinae.
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Affiliation(s)
- S A Marshall
- School of Environmental Sciences, University of Guelph, Guelph, Ontario, Canada N1G 2W1; unknown
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25
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Marshall SA, Luk SPL, Dong H. A revision of the New Zealand species of Howickia Richards. Zootaxa 2014; 3887:1-36. [PMID: 25543921 DOI: 10.11646/zootaxa.3887.1.1] [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] [Received: 11/20/2014] [Indexed: 11/04/2022]
Abstract
Howickia Richards 1951 is redefined to include all wingless or strongly brachypterous Sphaeroceridae in New Zealand as well as two newly described fully winged species, H. oliveri and H. lepidostylus. Biroina Richards 1973 is newly treated as a junior subjective synonym of Howickia. The following new flightless species are described from New Zealand: H. bicolor, H. cordata, H. exasperata, H. harrisoni, H. mercurialis, H. nigrilegula, H. nigriventer, H. nudistylus, H. omamari, H. palmai, H. regalis, H. tangata, H. wahaika and H. zonula.
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Affiliation(s)
- S A Marshall
- School of Environmental Sciences, University of Guelph, Guelph, ON, Canada N1G 2W1.;
| | - S P L Luk
- School of Environmental Sciences, University of Guelph, Guelph, ON, Canada N1G 2W1.;
| | - H Dong
- Key Laboratory of Southern Subtropical Plant Diversity, Fairylake Botanical Garden, Shenzhen & Chinese Academy of Sciences, Shenzhen, Guangdong, China 518004.;
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26
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Geil CR, Hayes DM, McClain JA, Liput DJ, Marshall SA, Chen KY, Nixon K. Alcohol and adult hippocampal neurogenesis: promiscuous drug, wanton effects. Prog Neuropsychopharmacol Biol Psychiatry 2014; 54:103-13. [PMID: 24842804 PMCID: PMC4134968 DOI: 10.1016/j.pnpbp.2014.05.003] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/22/2014] [Revised: 05/01/2014] [Accepted: 05/08/2014] [Indexed: 01/29/2023]
Abstract
Adult neurogenesis is now widely accepted as an important contributor to hippocampal integrity and function but also dysfunction when adult neurogenesis is affected in neuropsychiatric diseases such as alcohol use disorders. Excessive alcohol consumption, the defining characteristic of alcohol use disorders, results in a variety of cognitive and behavioral impairments related wholly or in part to hippocampal structure and function. Recent preclinical work has shown that adult neurogenesis may be one route by which alcohol produces hippocampal neuropathology. Alcohol is a pharmacologically promiscuous drug capable of interfering with adult neurogenesis through multiple mechanisms. This review will discuss the primary mechanisms underlying alcohol-induced changes in adult hippocampal neurogenesis including alcohol's effects on neurotransmitters, CREB and its downstream effectors, and the neurogenic niche.
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Affiliation(s)
| | | | | | | | | | | | - Kimberly Nixon
- Department of Pharmaceutical Sciences, University of Kentucky, Lexington, KY 40536, United States.
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27
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Marshall SA, McClain JA, Kelso ML, Hopkins DM, Pauly JR, Nixon K. Microglial activation is not equivalent to neuroinflammation in alcohol-induced neurodegeneration: The importance of microglia phenotype. Neurobiol Dis 2013; 54:239-51. [PMID: 23313316 DOI: 10.1016/j.nbd.2012.12.016] [Citation(s) in RCA: 184] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2012] [Revised: 12/21/2012] [Accepted: 12/28/2012] [Indexed: 12/19/2022] Open
Abstract
Excessive alcohol intake, a defining characteristic of an alcohol use disorder (AUD), results in neurodegeneration in the hippocampus and entorhinal cortex that has been linked to a variety of cognitive deficits. Neuroinflammation is thought to be a factor in alcohol-induced neurodegeneration, and microglia activation is a key but not sole component of an inflammatory response. These experiments investigate the effects of ethanol exposure in a well-accepted model of an AUD on both microglial activation and blood brain barrier disruption (BBB) in order to understand their relationship to classical definitions of inflammation and alcohol-induced neurodegeneration. Following a four-day binge ethanol paradigm, rat hippocampal and entorhinal cortex tissue was examined using three distinct approaches to determine microglia phenotype and BBB disruption: immunohistochemistry, autoradiography, and ELISA. After ethanol exposure, there was an increase in [(3)H]-PK-11195 binding and OX-42 immunoreactivity indicative of microglial activation; however, microglia were not fully activated since both OX-6 and ED-1 immunoreactive microglia were absent. This data was supported by functional evidence as there was no increase in the proinflammatory cytokines IL-6 or TNF-α, but a 26% increase in the anti-inflammatory cytokine, IL-10, and a 38% increase in the growth factor, TGF-β, seven days after exposure. Furthermore, there was no evidence of a disruption of the BBB. These data suggest that the four-day binge model of an AUD, which produces neurodegeneration in corticolimbic regions, does not elicit classical neuroinflammation but instead produces partially activated microglia. Partial activation of microglia following binge ethanol exposure suggest that microglia in this model have beneficial or homeostatic roles rather than directly contributing to neurodegeneration and are a consequence of alcohol-induced-damage instead of the source of damage.
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Affiliation(s)
- S Alex Marshall
- Department of Pharmaceutical Sciences, The University of Kentucky, Lexington, KY 40536-0596, USA
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28
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Abstract
The Caribbean and North American species of the large, otherwise neotropical genus Grallipeza Rondani (Diptera: Micropezidae: Taeniapterinae) are revised and keyed. One species, G. nebulosa (Loew), is endemic to the southeastern United States and eighteen species are endemic to single Caribbean islands. Of these, the following nine are described as new: Grallipeza abeja, G. albiterga, G. cliffi, G. grenada, G marleyi, G. mellea, G. paraplacida, G. perezi and G. turba.
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29
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Morris SA, Kelso ML, Liput DJ, Marshall SA, Nixon K. Similar withdrawal severity in adolescents and adults in a rat model of alcohol dependence. Alcohol 2010; 44:89-98. [PMID: 20113877 DOI: 10.1016/j.alcohol.2009.10.017] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2009] [Revised: 10/29/2009] [Accepted: 10/30/2009] [Indexed: 12/11/2022]
Abstract
Alcohol use during adolescence leads to increased risk of developing an alcohol use disorder (AUD) during adulthood. Converging evidence suggests that this period of enhanced vulnerability for developing an AUD may be due to the adolescent's unique sensitivity and response to alcohol. Adolescent rats have been shown to be less sensitive to alcohol intoxication and withdrawal susceptibility; however, age differences in ethanol pharmacokinetics may underlie these effects. Therefore, this study investigated alcohol intoxication behavior and withdrawal severity using a modified Majchrowicz model of alcohol dependence that has been shown to result in similar blood ethanol concentrations (BECs) despite age differences. Adolescent (postnatal day, PND, 35) and adult rats (PND 70+) received ethanol according to this 4-day binge paradigm and were observed for withdrawal behavior for 17h. As expected, adolescents showed decreased sensitivity to alcohol-induced CNS depression as evidenced by significantly lower intoxication scores. Thus, adolescents received significantly more ethanol each day (12.3+/-0.1g/kg/day) than adults (9.2+/-0.2g/kg/day). Despite greater ethanol dosing in adolescent rats, both adolescent and adult groups had comparable peak BECs (344.5+/-10.2 and 338.5+/-7.8mg/dL, respectively). Strikingly, withdrawal severity was similar quantitatively and qualitatively between adolescent and adult rats. Further, this is the first time that withdrawal behavior has been reported for adolescent rats using this model of alcohol dependence. A second experiment confirmed the similarity in BECs at various time points across the binge. These results demonstrate that after consideration of ethanol pharmacokinetics between adults and adolescents by using a model that produces similar BECs, withdrawal severity is nearly identical. This study, in combination with previous reports on ethanol withdrawal in adolescents and adults, suggests only a BEC-dependent effect of ethanol on withdrawal severity regardless of age.
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Affiliation(s)
- S A Morris
- Department of Pharmaceutical Sciences, The University of Kentucky, Lexington, 40536-0082, USA
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30
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Lalonde RL, Kowalski KG, Hutmacher MM, Ewy W, Nichols DJ, Milligan PA, Corrigan BW, Lockwood PA, Marshall SA, Benincosa LJ, Tensfeldt TG, Parivar K, Amantea M, Glue P, Koide H, Miller R. Model-based Drug Development. Clin Pharmacol Ther 2007; 82:21-32. [PMID: 17522597 DOI: 10.1038/sj.clpt.6100235] [Citation(s) in RCA: 343] [Impact Index Per Article: 20.2] [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: 11/08/2022]
Abstract
The low productivity and escalating costs of drug development have been well documented over the past several years. Less than 10% of new compounds that enter clinical trials ultimately make it to the market, and many more fail in the preclinical stages of development. These challenges in the "critical path" of drug development are discussed in a 2004 publication by the US Food and Drug Administration. The document emphasizes new tools and various opportunities to improve drug development. One of the opportunities recommended is the application of "model-based drug development (MBDD)." This paper discusses what constitutes the key elements of MBDD and how these elements should fit together to inform drug development strategy and decision-making.
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Affiliation(s)
- R L Lalonde
- Department of Clinical Pharmacology, Pfizer Global Research and Development, Groton, CT, USA.
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31
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Burns JL, Saiman L, Whittier S, Krzewinski J, Liu Z, Larone D, Marshall SA, Jones RN. Comparison of two commercial systems (Vitek and MicroScan-WalkAway) for antimicrobial susceptibility testing of Pseudomonas aeruginosa isolates from cystic fibrosis patients. Diagn Microbiol Infect Dis 2001; 39:257-60. [PMID: 11404070 DOI: 10.1016/s0732-8893(01)00234-6] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.2] [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
Antimicrobial susceptibility testing of cystic fibrosis (CF) isolates of Pseudomonas aeruginosa is difficult because the organisms are often mucoid and slow-growing. This study of 498 CF strains examined the correlation of results derived from two commonly used commercial systems (Vitek, MicroScan-WalkAway) with a reference method for 10 antimicrobials. Correlation to reference results was unacceptably low for all agents and both commercial systems had a high rate of very major (false-susceptible) errors. Although mucoid strains produced a 4.8% greater intermethod error, it was not markedly different than non-mucoid strains for the Vitek System. Overall, these tested commercial systems performed poorly for CF isolates in contrast to earlier reported, high correlations with the reference methods (broth microdilution frozen panels and agar dilution) of the National Committee for Clinical Laboratory Standards, the standardized disk diffusion test, and the Etest (AB BIODISK, Solna, Sweden).
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Affiliation(s)
- J L Burns
- Department of Pediatrics, Division of Infectious Disease, Children's Hospital and Regional Medical Center, University of Washington, P.O. Box 5371/CH-32, Seattle, WA 98105-0371, USA.
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32
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Abstract
We have developed a method to determine the optimal binary pattern (arrangement of hydrophobic and polar amino acids) of a target protein fold prior to amino acid sequence selection in protein design studies. A solvent accessible surface is generated for a target fold using its backbone coordinates and "generic" side-chains, which are constructs whose size and shape are similar to an average amino acid. Each position is classified as hydrophobic or polar according to the solvent exposure of its generic side-chain. The method was tested by analyzing a set of proteins in the Protein Data Bank and by experimentally constructing and analyzing a set of engrailed homeodomain variants whose binary patterns were systematically varied. Selection of the optimal binary pattern results in a designed protein that is monomeric, well-folded, and hyperthermophilic. Homeodomain variants with fewer hydrophobic residues are destabilized, while additional hydrophobic residues induce aggregation. Binary patterning, in conjunction with a force field that models folded state energies, appears sufficient to satisfy two basic goals of protein design: stability and conformational specificity.
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Affiliation(s)
- S A Marshall
- Division of Chemistry and Chemical Engineering, California Institute of Technology, 1200 East California Blvd., Pasadena, CA 91125, USA
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Yamazumi T, Marshall SA, Wilke WW, Diekema DJ, Pfaller MA, Jones RN. Comparison of the Vitek Gram-Positive Susceptibility 106 card and the MRSA-screen latex agglutination test for determining oxacillin resistance in clinical bloodstream isolates of Staphylococcus aureus. J Clin Microbiol 2001; 39:53-6. [PMID: 11136748 PMCID: PMC87679 DOI: 10.1128/jcm.39.1.53-56.2001] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.0] [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] Open
Abstract
The Vitek automated susceptibility testing system with a modified Gram-Positive Susceptibility (GPS) 106 Card (bioMerieux Vitek, Inc., Hazelwood, Mo.) and a rapid slide latex agglutination test (MRSA-Screen; Denka Seiken Co., Ltd., Tokyo, Japan) were evaluated for their ability to detect oxacillin resistance in Staphylococcus aureus. The oxacillin-salt agar screen (OS) test, the reference broth microdilution method, and the detection of the mecA gene by PCR were compared with the commercial products. A total of 200 contemporary (1999) bloodstream infection isolates were collected from the SENTRY Antimicrobial Surveillance Program, representing diverse geographic areas throughout the world. Among the 99 mecA-positive isolates, 3 isolates were found negative by the MRSA-Screen. Another two isolates did not grow on OS plates and had MICs of 0.5 and 2 microg/ml with the Vitek GPS card. All 101 mecA-negative isolates were also found negative by the MRSA-Screen and were categorized as susceptible by the GPS card. Overall, the MRSA-Screen, GPS card, and OS test had sensitivities of 96.9, 98.0, and 98.0% and specificities of 100.0, 100.0, and 98.0%, respectively. MRSA-Screen was a rapid (</=15 min) and simple test to perform, and the GPS card provided results in <8 h. Both methods were sensitive and specific for detecting staphylococcal oxacillin resistance in the clinical microbiology laboratory.
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Affiliation(s)
- T Yamazumi
- Medical Microbiology Division, Department of Pathology, University of Iowa College of Medicine, Iowa City, Iowa 52242, USA
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34
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Marshall SA, Kugler KC, Jones RN. Evaluation of quinupristin/dalfopristin (Synercid) and RPR 106972 stability in susceptibility testing media. Int J Antimicrob Agents 2000; 15:291-7. [PMID: 10929879 DOI: 10.1016/s0924-8579(00)00180-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [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: 10/27/2022]
Abstract
In response to conflicting reports on the chemical stability of quinupristin/dalfopristin, a study was designed to assess the in vitro longevity and effects of media and storage conditions on this streptogramin combination. Broth microdilution trays containing parenteral (quinupristin/dalfopristin) and oral (RPR 106972) streptogramin combinations as well as pristinomycin components (P-I and P-II) were preincubated at 35 degrees C for 12-72 h before inoculation with control strains (Streptococcus pneumoniae ATCC 49619, Haemophilus influenzae ATCC 49247, Enterococcus faecalis ATCC 29212, Staphylococcus aureus ATCC 29213) and five clinical isolates with various drug resistance phenotypes. Overall, the mean quinupristin/dalfopristin activity loss was 24%/12 h, 41%/18 h, 43%/24 h, 69%/48 h and 79%/72 h with no detected loss of potency when measured by E. faecalis until 18 h. RPR 106972 mean activity loss was 6%/12 h, 19%/18 h, 19%/24 h, 56%/48 h and 71%/72 h with no loss of potency as measured by S. aureus until 48 h. Overall, P-I components had greater stability as compared with P-II for both drug combinations. Bioassays showed similar trends in decreased activity. Bioassay differences among media types were only significant (> 3 mm; greater loss of potency) for haemophilus test media for both P-II components at 72 h. The presence of an organism in the medium had no effect on stability assay results. The effect of storage temperature (4, 25 degrees C) on quinupristin/dalfopristin and RPR 106972 stability was also detrimental to drug potency indicating the requirement for rigid quality assurance for streptogramin diagnostic reagents when determining activity by reference or standardized susceptibility tests.
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Affiliation(s)
- S A Marshall
- Department of Pathology, University of Iowa College of Medicine, Iowa City 52242, USA
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35
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Marshall SA, Erwin ME, Jones RN. Determination of MIC quality control ranges for ABT-733, a novel ketolide antimicrobial agent. Quality Control Study Group. J Clin Microbiol 2000; 38:2462-3. [PMID: 10917777 PMCID: PMC86848 DOI: 10.1128/jcm.38.6.2462-2463.2000] [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] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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36
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Burns JL, Saiman L, Whittier S, Larone D, Krzewinski J, Liu Z, Marshall SA, Jones RN. Comparison of agar diffusion methodologies for antimicrobial susceptibility testing of Pseudomonas aeruginosa isolates from cystic fibrosis patients. J Clin Microbiol 2000; 38:1818-22. [PMID: 10790106 PMCID: PMC86597 DOI: 10.1128/jcm.38.5.1818-1822.2000] [Citation(s) in RCA: 65] [Impact Index Per Article: 2.7] [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] Open
Abstract
Pseudomonas aeruginosa is the most common pathogen infecting the lungs of patients with cystic fibrosis (CF). Improved antimicrobial chemotherapy has significantly increased the life expectancy of these patients. However, accurate susceptibility testing of P. aeruginosa isolates from CF sputum may be difficult because the organisms are often mucoid and slow growing. This study of 597 CF isolates of P. aeruginosa examined the correlation of disk diffusion and Etest (AB BIODISK, Solna, Sweden) results with a reference broth microdilution method. The rates of interpretive errors for 12 commonly used antipseudomonal antimicrobials were determined. The disk diffusion method correlated well (zone diameter versus MIC) for all of the agents tested. However, for mucoid isolates, correlation coefficients (r values) for piperacillin, piperacillin-tazobactam, and meropenem were <0.80. The Etest correlation with reference broth microdilution results (MIC versus MIC) was acceptable for all of the agents tested, for both mucoid and nonmucoid isolates. Category interpretation errors were similar for the disk diffusion and Etest methods with 0.4 and 0.1%, respectively, very major errors (false susceptibility) and 1.1 and 2.2% major errors (false resistance). Overall, both agar diffusion methods appear to be broadly acceptable for routine clinical use in susceptibility testing of CF isolates of P. aeruginosa.
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Affiliation(s)
- J L Burns
- Department of Pediatrics, Division of Infectious Disease, University of Washington, Seattle, Washington, USA.
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37
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Saiman L, Burns JL, Whittier S, Krzewinski J, Marshall SA, Jones RN. Evaluation of reference dilution test methods for antimicrobial susceptibility testing of Pseudomonas aeruginosa strains isolated from patients with cystic fibrosis. J Clin Microbiol 1999; 37:2987-91. [PMID: 10449487 PMCID: PMC85429 DOI: 10.1128/jcm.37.9.2987-2991.1999] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.5] [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: 01/10/2023] Open
Abstract
The development of multidrug-resistant Pseudomonas aeruginosa in patients with cystic fibrosis (CF) is most likely a consequence of increasing life expectancy and more prolonged exposure to antibiotics. The optimal method for antibiotic susceptibility testing of CF strains, particularly mucoid P. aeruginosa strains, is unknown. Antimicrobial susceptibilities of 48 CF strains (25 mucoid) and 50 non-CF strains to 12 anti-Pseudomonas agents were tested by both agar dilution and commercially custom-prepared broth microdilution plates (PML Microbiologicals, Portland, Oreg.) in three laboratories simultaneously to determine if broth microdilution could substitute for agar dilution as the reference method in subsequent studies. Comparison of MICs generated by agar dilution and broth microdilution demonstrated correlation coefficients (r) exceeding 0.85 for all agents tested; correlation was excellent for aminoglycosides (r >/= 0.92) and very good for beta-lactam agents including agents paired with a beta-lactamase inhibitor (r >/= 0.87) and for ciprofloxacin (r = 0.86). Correlation was not improved by 48-h readings, but correlation between 24- and 48-h readings ranged between 0.91 and 0.98 for both methods. Interlaboratory variations were minimal, as the percentage of acceptable variations was 94% for both methods, and serious discords were infrequent (<2% of comparisons). However, CF strains were more likely to have serious discords than were non-CF strains (P < 0. 0001), although mucoid strains were not more likely to have serious discords than were nonmucoid strains. In this study, MICs determined by custom-prepared broth microdilution compared favorably with MICs determined by agar dilution. Thus, this broth microdilution assay can serve as a reference method and facilitate future studies to determine the optimal method for antibiotic susceptibility testing of CF strains.
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Affiliation(s)
- L Saiman
- Department of Pediatrics and Clinical Microbiology, Columbia University, New York, New York 10032, USA.
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38
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Abstract
Recent successes in protein design have illustrated the promise of computational approaches. These methods rely on energy expressions to evaluate the quality of different amino acid sequences for target protein structures. The force fields optimized for design differ from those typically used in molecular mechanics and molecular dynamics calculations.
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Affiliation(s)
- D B Gordon
- Division of Chemistry and Chemical Engineering, California Institute of Technology, MC 147-75, Pasadena, CA 91125, USA
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39
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Marshall SA, Pfaller MA, Jones RN. Ability of the modified Vitek card to detect coagulase-negative staphylococcal with mecA and Oxacillin-resistant phenotypes. J Clin Microbiol 1999; 37:2122-3. [PMID: 10383264 PMCID: PMC85063 DOI: 10.1128/jcm.37.6.2122-2123.1999] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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40
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Jones RN, Marshall SA, Erwin ME. Antimicrobial activity and spectrum of SCH27899 (Ziracin) tested against gram-positive species including recommendations for routine susceptibility testing methods and quality control. Quality Control Study Group. Diagn Microbiol Infect Dis 1999; 34:103-10. [PMID: 10354859 DOI: 10.1016/s0732-8893(98)00093-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [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: 10/18/2022]
Abstract
SCH27899 is an oligosaccharide, everninomicin antibiotic with activity primarily against Gram-positive pathogens. The activity of SCH27899 was evaluated against 360 routine clinical isolates by the broth microdilution (BMD), agar dilution (AD), disk diffusion (DD), and Etest (AB BIODISK, Solna, Sweden) methods. In addition, results from a nine center SCH27899 quality control (QC) trial were used to establish QC ranges. SCH27899 MICs for 330 Gram-Positive strains, including multiply-resistant staphylococci and enterococci, ranged from 0.015 to 1 microgram/ml with MIC90s of 0.12 to 0.5 microgram/ ml. SCH27899 had no measurable activity against the 30 selected Gram-negative strains tested (MICs, > 256 micrograms/ml), with the exception of Moraxella catarrhalis MICs, 0.12 microgram/ ml). Etest MICs for SCH27899 correlated well with AD and BMD results with > 90% of MICs within +/- one log2 dilutions of the reference test results. Three disk concentrations (2.5-, 5-, 10-microgram) of SCH27899 were evaluated, but minimal difference of zone diameters between disk drug contents was observed (+/- 2 mm). SCH27899 disk zone diameters correlated poorly with reference MICs due to small zone diameters (range, 11 to 22 mm) attributed to poor diffusion through agar mediums, a product of this compound's high molecular weight and solubility. The use of the DD method for SCH27899 was not recommended. The proposed MIC quality assurance limits for SCH27899 using Staphylococcus aureus ATCC 29213 and Enterococcus faecalis ATCC 29212 was 0.06 to 0.25 microgram/ml for both QC strains and methods. SCH27899 appears to be a eveminomicin-derivative widely active against important Gram-positive cocci, and in vitro dilution testing methods would be preferred for clinical use, validated by the recommended MIC control ranges cited in this report.
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Affiliation(s)
- R N Jones
- Department of Pathology, University of Iowa College of Medicine, Iowa City 52242, USA
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41
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Diekema DJ, Coffman SL, Marshall SA, Beach ML, Rolston KV, Jones RN. Comparison of activities of broad-spectrum beta-lactam compounds against 1,128 gram-positive cocci recently isolated in cancer treatment centers. Antimicrob Agents Chemother 1999; 43:940-3. [PMID: 10103204 PMCID: PMC89230 DOI: 10.1128/aac.43.4.940] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [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] Open
Abstract
We report the in vitro activities of broad-spectrum beta-lactam antimicrobials tested against 1,128 gram-positive pathogens recently isolated from cancer patients. Cefepime and imipenem were more active than ceftazidime and ceftriaxone against these organisms. Only vancomycin demonstrated reliable activity against oxacillin-resistant staphylococci, Enterococcus spp., and Corynebacterium spp. The spectrum of gram-positive organisms against which cefepime and imipenem have activity provides an advantage over ceftazidime as empiric therapy for cancer patients, potentially reducing the need for the empiric addition of glycopeptides.
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Affiliation(s)
- D J Diekema
- Department of Pathology, University of Iowa College of Medicine, Iowa City 52242, USA.
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42
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Biedenbach DJ, Marshall SA, Jones RN. Accuracy of cefepime antimicrobial susceptibility testing results for Pseudomonas aeruginosa tested on the MicroScan WalkAway System. Diagn Microbiol Infect Dis 1999; 33:305-7. [PMID: 10212758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
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43
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Marshall SA, Jones RN. Spectrum and antimicrobial activity of alexomycin (PNU-82, 127), a peptide compound projected for use in animal health. Diagn Microbiol Infect Dis 1999; 33:181-6. [PMID: 10092967 DOI: 10.1016/s0732-8893(98)00073-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [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: 11/21/2022]
Abstract
Alexomycin (PNU-82, 127) is a thiopeptide antimicrobial complex intended for veterinary practice that belongs to a series of cyclic peptides produced by Streptomyces arginensis. MICs against selected routine and fastidious clinical isolates of animal and human origin were determined by broth microdilution or agar dilution reference methods. Alexomycin was active against Gram-positive pathogens such as oxacillin-susceptible and -resistant Staphylococcus aureus and coagulase-negative staphylococci (260 strains; MIC90, 0.5 microgram/mL), as well as Enterococcus species (95 strains; MIC90, 0.25 to 0.5 microgram/mL), and generally inactive against Gram-negative aerobes. Alexomycin had more potent activity against Streptococcus bovis (MIC90, 0.12 microgram/mL), S. agalactiae (MIC90, 0.12 microgram/mL), Corynebacterium species (MIC90, 0.06-0.12 microgram/mL), and Listeria monocytogenes (MIC90, 0.5 microgram/mL). Alexomycin activity was limited against Bacillus species (MIC90, 1 microgram/mL), Neisseria meningiditis (MIC90, 2 micrograms/mL), Haemophilus influenzae (MIC90, 8 micrograms/mL), Moraxella catarrhalis (MIC90, 16 micrograms/mL), and Campylobacter jejuni (MIC90, 32 micrograms/mL). This thiopeptide complex was also found to be stable at low concentrations (0.015-32 micrograms/mL) in Mueller-Hinton broth for up to 24 h, possesses static antimicrobial activity and did not produce resistant mutants after multiple passages at subinhibitory drug concentrations. Alexomycin seems to have potential for use as a feed additive to increase feed efficiency and promote growth in poultry and swine as well as other applications against Gram-positive pathogens.
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Affiliation(s)
- S A Marshall
- Department of Pathology, University of Iowa College of Medicine, Iowa City 52242, USA
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Marshall SA, Jones RN, Erwin ME. Antimicrobial activity of SCH27899 (Ziracin), a novel everninomicin derivative, tested against Streptococcus spp.: disk diffusion/etest method evaluations and quality control guidelines. The Quality Control Study Group. Diagn Microbiol Infect Dis 1999; 33:19-25. [PMID: 9990471 DOI: 10.1016/s0732-8893(98)00105-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [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: 11/25/2022]
Abstract
To combat the increasing rates of penicillin resistance among pneumococci and viridans group streptococci, new Gram-positive active agents are needed to avoid the overuse of vancomycin. SCH27899 is an everninomicin derivative with strong activity against glycopeptide-resistant enterococci, oxacillin-resistant staphylococci, and penicillin-resistant streptococci. This study tests the in vitro activity of SCH27899 against 304 strains of streptococci and evaluates the quality of the agar dilution, broth microdilution, disk diffusion, and Etest methods for this antimicrobial agent. Quality-control (QC) ranges for SCH27899 are also proposed. SCH27899 broth microdilution MICs among the penicillin-susceptible and -resistant streptococci tested ranged from < or = 0.008-0.5 microgram/mL. Organism groups with their respective MIC90s were as follows: Streptococcus pneumoniae (100 strains) and beta-haemolytic streptococci (70 strains), 0.12 microgram/mL; Streptococcus bovis (10 strains), 0.25 microgram/mL; and viridans group streptococci (124 strains), 0.5 microgram/mL. Etest SCH27899 MICs correlated well with broth microdilution MICs (92% +/- one log2 dilution, 98% +/- two log2 dilutions). Agar dilution SCH27899 MICs correlated well with broth microdilution MICs, but a shift toward slightly higher agar dilution MICs was attributed to difficulties in reading trailing endpoints with this method. Three concentrations (2.5, 5, and 10 micrograms) of SCH27899 were used for the disk diffusion method with small inhibition zone diameters (range, 11 to 19 mm) and limited variation between diameters (+/- 2 mm) as a result, both products of this compound's high molecular weight and poor diffusion through agar mediums. Proposed control ranges for SCH27899 when testing S. pneumoniae ATCC 49619 from a nine-center (30 tests per center) quality-control trial are < or = 0.016 to 0.032 microgram/mL for Etest, and 0.008 to 0.032 microgram/mL for broth microdilution tests from an earlier study. Because of the limited diffusion ability and bacteriostatic nature of SCH27899, MICs should be read at 80% of inhibition with agar in vitro systems (Etest, agar dilution), and the disk diffusion method is not recommended.
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Affiliation(s)
- S A Marshall
- Department of Pathology, University of Iowa College of Medicine, Iowa City 52242, USA
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Biedenbach DJ, Jones RN, Marshall SA, Johnson DM, Croco MAT. Antimicrobial Activity of Gatifloxacin Against Stenotrophomonas maltophilia and Burkholderia spp. Drugs 1999. [DOI: 10.2165/00003495-199958002-00052] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
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Jones RN, Marshall SA, Varnam DJ. Activity of a broad-spectrum cephalosporin (Ro 48-8391) alone and in combination with two novel beta-lactamase inhibitors (Ro 48-5545 and Ro 48-8724). Diagn Microbiol Infect Dis 1998; 32:85-94. [PMID: 9823530 DOI: 10.1016/s0732-8893(98)00045-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [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: 10/18/2022]
Abstract
The susceptibility of a group of beta-lactamase-producing and drug-resistant Gram-positive and Gram-negative organisms was tested against a novel cephalosporin (Ro 48-8391) alone and in combination with two bridged carbacephem beta-lactamase inhibitors (Ro 48-5545 or Ro 48-8724) and compared with that of ceftriaxone, ceftazidime, and cefepime (representative "third- and fourth-generation" cephalosporins), imipenem, and a combination of piperacillin and tazobactam. Five hundred and one selected clinical isolates were tested using the reference broth microdilution method (National Committee for Clinical Laboratory Standards). Ro 48-8391 has a spectrum of activity and potency most similar to ceftriaxone but with improved activity against Gram-positive species. The two beta-lactamase inhibitors, Ro 48-5545 and Ro 48-8724, have modest antimicrobial activity. When combined with Ro 48-8391, the beta-lactamase inhibitor Ro 48-8724 was superior to the combination of Ro 48-8391 and Ro 48-5545 in spectrum and enzyme inhibition against extended spectrum beta-lactamase enzyme-producing Escherichia coli and Klebsiella pneumoniae, and against Enterobacteriaceae with "stably derepressed" Bush-Jacoby-Medeiros gr 1 enzymes (ceftazidime-resistant Enterobacter and Citrobacter). Ro 48-5545 and Ro 48-8724 appear to be promising beta-lactamase inhibitors with potential application against chromosomal- and plasmid-mediated enzymes. Ro 48-8391, although superior to some currently available "third-generation" cephems, was not a well-matched active codrug because of limited activity against several commonly isolated species of clinically important bacteria. Further efforts are necessary to find a penicillin or cephem with activity more complementary to that of the tested beta-lactamase inhibitors and the Ro 48-8391 compound could be focused for therapeutic use in serious streptococcal infections.
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Affiliation(s)
- R N Jones
- Department of Pathology, University of Iowa College of Medicine, Iowa City 52242, USA
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Chen YS, Marshall SA, Winokur PL, Coffman SL, Wilke WW, Murray PR, Spiegel CA, Pfaller MA, Doern GV, Jones RN. Use of molecular and reference susceptibility testing methods in a multicenter evaluation of MicroScan dried overnight gram-positive MIC panels for detection of vancomycin and high-level aminoglycoside resistances in enterococci. J Clin Microbiol 1998; 36:2996-3001. [PMID: 9738056 PMCID: PMC105100 DOI: 10.1128/jcm.36.10.2996-3001.1998] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [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] Open
Abstract
Modified MicroScan gram-positive MIC no. 8 panels (PM-8) were analyzed for their improved ability to detect vancomycin resistance (VR) and high-level aminoglycoside resistance (HLAR) in enterococci. A validation study design that utilized selected challenge strains, recent clinical isolates, and reproducibility experiments in a multicenter format was selected. Three independent medical centers compared the commercial panels to reference broth microdilution panels (RBM) and Synergy Quad Agar (QA). Resistance was verified by demonstration of VR and HLAR genes by PCR tests. The study was conducted in three phases. (i) In the challenge phase (CP), two well-characterized sets of enterococci were obtained from the Centers for Disease Control and Prevention; one set contained 50 isolates for VR testing and one contained 48 isolates for HLAR testing. In addition, a set of 47 well-characterized isolates representing diverse geographic areas, obtained from earlier national surveillance studies, was tested at the University of Iowa College of Medicine (UICM). (ii) In the efficacy phase (EP), each laboratory tested 50 recent, unique clinical isolates by all methods. (iii) In the reproducibility Phase (RP), each laboratory tested the same 10 strains by all methods in triplicate on three separate days. All isolates from the EP were sent to the UICM for molecular characterization of vanA, -B, -C1, -C2-3, and HLAR genes. In the CP, the ranking of test methods by error rates (in parentheses; very major and major errors combined, versus PCR results) were as follows: for high-level streptomycin resistance (HLSR), QA (12.0%) > PM-8 (5.2%) > RBM (1.6%); for high-level gentamicin resistance (HLGR), RBM (3.7%) > PM-8 (3.1%) > QA (2.6%); and for VR, RBM = QA (3.0%) > PM-8 (1.2%). In the EP, agreement between all methods and the reference PCR result was 98.0% for HLSR, 99.3% for HLGR, and 98. 6% for VR. In the RP, the percentages of results +/- 1 log2 dilution of the all-participant mode were as follows: for VR, 100% (PM-8), 98.9% (QA), and 90.0% (RBM); for HLSR, 99.6% (RBM), 98.5% (PM-8), and 82.2% (QA); and for HLGR, 99.6% (RBM), 99.3% (PM-8), and 98.1% (QA). The ability of the PM-8 to detect VR and HLAR in enterococci was comparable to those for reference susceptibility and molecular PCR methods and was considered acceptable for routine clinical laboratory use.
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Affiliation(s)
- Y S Chen
- Departments of Pathology, University of Iowa, Iowa City, Iowa 52242, USA
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Jones RN, Biedenbach DJ, Marshall SA, Pfaller MA, Doern GV. Evaluation of the Vitek system to accurately test the susceptibility of Pseudomonas aeruginosa clinical isolates against cefepime. Diagn Microbiol Infect Dis 1998; 32:107-10. [PMID: 9823533 DOI: 10.1016/s0732-8893(98)00051-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [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: 11/27/2022]
Abstract
A total of 300 recent blood stream and pneumonia isolates of Pseudomonas aeruginosa from 32 different medical centers in the United States were used to assess the accuracy of the Vitek System (GNS-107 card) for cefepime, a new "fourth-generation" cephalosporin. The Vitek System test result was compared to the consensus of the three other methods (reference broth microdilution, disk diffusion, Etest (AB BIODISK, Solna, Sweden)); and 271 of 300 consensus category of susceptibility sets were unanimous. The Vitek System produced a 25.3% error rate (5.3% false resistance, 20.0% minor errors). A consistent trend toward higher MIC results with the Vitek System was observed that produced a 15.3 to 21.3% lower susceptible rate compared with the other susceptibility test methods. The consensus cefepime resistance rate was only 4.3% compared to 14.0% for the Vitek GNS-107 card. The error was reproducible on triplicate repeat testing. These results indicate an unacceptable rate of false resistance being produced by the Vitek System when testing cefepime against P. aeruginosa strains. Alternative methods are suggested for this broad-spectrum antipseudomonal cephalosporin.
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Affiliation(s)
- R N Jones
- Department of Pathology, University of Iowa College of Medicine, Iowa City 52242, USA
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Marshall SA, Wilke WW, Pfaller MA, Jones RN. Staphylococcus aureus and coagulase-negative staphylococci from blood stream infections: frequency of occurrence, antimicrobial susceptibility, and molecular (mecA) characterization of oxacillin resistance in the SCOPE program. Diagn Microbiol Infect Dis 1998; 30:205-14. [PMID: 9572028 DOI: 10.1016/s0732-8893(97)00212-5] [Citation(s) in RCA: 87] [Impact Index Per Article: 3.3] [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: 02/07/2023]
Abstract
Staphylococci are major causes of nosocomial blood stream infection. The recently completed SCOPE Surveillance Program found that coagulase-negative staphylococci (CoNS) and Staphylococcus aureus were the first and second most common etiologic agents, respectively, causing nosocomial blood stream infection in the USA. The frequency of oxacillin resistance was 68% among 1553 strains of CoNS and 26% among 787 strains of S. aureus in this study. Extended susceptibility profiles were generated for a subset of 150 S. aureus and 300 CoNS against 16 antimicrobial agents. Oxacillin-susceptible strains of both CoNS and S. aureus were uniformly susceptible to beta-lactam agents with the exception of ampicillin and penicillin. Oxacillin-susceptible S. aureus were also highly susceptible to the fluoroquinolones, aminoglycosides, and trimethoprim/sulfamethoxazole. The oxacillin-susceptible CoNS were less susceptible to these agents, and only glycopeptides were reliably active against oxacillin-resistant strains. PCR detection of the mecA gene was used to scrutinize current NCCLS interpretive breakpoint MICs for determining susceptibility or resistance to oxacillin. We found complete concordance between the presence or absence of mecA and the NCCLS oxacillin interpretive breakpoint categories for S. aureus. In contrast, the NCCLS breakpoints for oxacillin significantly underestimate the degree of true oxacillin resistance among CoNS. Using the presence of mecA as the reference standard, we detected 15.7% false susceptibility to oxacillin using a MIC susceptible breakpoint concentration of < or = 2 micrograms/mL. Lowering the oxacillin MIC breakpoint to < or = 0.25 microgram/mL for CoNS would greatly improve the accuracy of the MIC test performance. We found that both the current oxacillin disk test and the 30-microgram ceftizoxime disk test functioned quite well in predicting those strains of CoNS that contain mecA. These studies have demonstrated both a high level of antimicrobial resistance among nosocomial blood stream isolates of staphylococci as well as significant problems with the current NCCLS breakpoints for oxacillin when testing CoNS.
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Affiliation(s)
- S A Marshall
- Department of Pathology, University of Iowa College of Medicine, Iowa City 52242, USA
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Marshall SA, Wilke WW, Chen YS, Pfaller MA, Jones RN. In vitro activity of cefepime and other broad-spectrum beta-lactams tested against 129 mec A-negative Staphylococcus spp. isolates: a multicenter sample. Diagn Microbiol Infect Dis 1998; 30:65-9. [PMID: 9488834 DOI: 10.1016/s0732-8893(97)00175-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [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: 02/06/2023]
Abstract
The in vitro activity of cefepime was compared to that of penicillin, piperacillin/tazobactam, ceftazidime, ceftriaxone, imipenem, vancomycin, and teicoplanin by using the broth microdilution method against 129 isolates of Staphylococcus [50 S. aureus and 79 coagulase-negative staphylococci (CoNS], selected for their lack of the mec A gene as determined by the polymerase chain reaction. These isolates were obtained from a recent (1995-1996) surveillance of nearly 5000 nosocomial blood stream isolates from more than 40 geographically diverse U.S. medical centers. These results were compared to CoNS results from the same collection selected for their phenotypic susceptibility to oxacillin (OS; MIC < or = 2 micrograms/ml) regardless of their med A genotype. Cefepime, as well as piperacillin/ tazobactam, ceftriaxone, and imipenem, showed 100% susceptibility against OS and mec A-negative staphylococci. Ceftazidime showed relative resistance (30.2% resistant) against CoNS classified as OS based on phenotypic characteristics (MIC < or = 2 micrograms/mL) as compared to strains of mec A-negative CoNS (5.1% resistant). Accurate phenotypic detection of mec A-positive staphylococci by simple standardized in vitro susceptibility tests becomes very important to guide empirical use of beta-lactams for therapy. Furthermore, previously published MIC90 and range data for broad-spectrum beta-lactams versus OS have been falsely elevated by the presence of mec A-positive strains. The greater use of these potent beta-lactams against true mec A-negative staphylococci should enhance clinical outcomes and reduce the need for vancomycin.
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Affiliation(s)
- S A Marshall
- Department of Pathology, University of Iowa College of Medicine, Iowa City 52242, USA
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