1
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Friedman JK, Taylor BC, Hagel Campbell E, Allen K, Bangerter A, Branson M, Bronfort G, Calvert C, Cross L, Driscoll M, Evans R, Ferguson JE, Haley A, Hennessy S, Meis LA, Burgess DJ. Gender differences in PTSD severity and pain outcomes: baseline results from the LAMP trial. medRxiv 2023:2023.10.13.23296998. [PMID: 37873176 PMCID: PMC10593051 DOI: 10.1101/2023.10.13.23296998] [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] [Subscribe] [Scholar Register] [Indexed: 10/25/2023]
Abstract
Background Post-traumatic stress disorder (PTSD) and chronic pain are highly prevalent comorbid conditions. Veterans dually burdened by PTSD and chronic pain experience more severe outcomes compared to either disorder alone. Few studies have enrolled enough women Veterans to test gender differences in pain outcomes [catastrophizing, intensity, interference] by the severity of PTSD. Aim Examine gender differences in the association between PTSD symptoms and pain outcomes among Veterans enrolled in a chronic pain clinical trial. Methods Participants were 421 men and 386 women Veterans with chronic pain who provided complete data on PTSD symptoms and pain outcomes. We used hierarchical linear regression models to examine gender differences in pain outcomes by PTSD symptoms. Results Adjusted multivariable models indicated that PTSD symptoms were associated with higher levels of pain catastrophizing (0.57, 95% CI [0.51, 0.63]), pain intensity (0.30, 95% CI [0.24, 0.37]), and pain interference (0.46, 95% CI [0.39, 0.52]). No evidence suggesting differences in this association were found in either the crude or adjusted models (all interaction p-values<0.05). Conclusion These findings may reflect the underlying mutual maintenance of these conditions whereby the sensation of pain could trigger PTSD symptoms, particularly if the trauma and pain are associated with the same event. Clinical implications and opportunities testing relevant treatments that may benefit both chronic pain and PTSD are discussed.
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Affiliation(s)
- J K Friedman
- Center for Care Delivery and Outcomes Research, Minneapolis Veterans Affairs Healthcare System (MVAHCS), Minneapolis, MN
- University of Minnesota Medical School, Minneapolis, MN
| | - B C Taylor
- Center for Care Delivery and Outcomes Research, Minneapolis Veterans Affairs Healthcare System (MVAHCS), Minneapolis, MN
- University of Minnesota Medical School, Minneapolis, MN
| | - E Hagel Campbell
- Center for Care Delivery and Outcomes Research, Minneapolis Veterans Affairs Healthcare System (MVAHCS), Minneapolis, MN
| | - K Allen
- Center of Innovation to Accelerate Discovery and Practice Transformation, Durham VAHCS, Durham, NC
- Thurston Arthritis Research Center, University of North Carolina at Chapel Hill, Chapel Hill, NC
| | - A Bangerter
- Center for Care Delivery and Outcomes Research, Minneapolis Veterans Affairs Healthcare System (MVAHCS), Minneapolis, MN
| | - M Branson
- Center for Care Delivery and Outcomes Research, Minneapolis Veterans Affairs Healthcare System (MVAHCS), Minneapolis, MN
| | - G Bronfort
- Integrative Health & Wellbeing Research Program, Bakken Center for Spirituality & Healing, University of Minnesota, Minneapolis, MN
- University of Minnesota School of Nursing, Minneapolis, MN
| | - C Calvert
- Center for Care Delivery and Outcomes Research, Minneapolis Veterans Affairs Healthcare System (MVAHCS), Minneapolis, MN
- University of Minnesota Medical School, Minneapolis, MN
| | - Ljs Cross
- Center for Care Delivery and Outcomes Research, Minneapolis Veterans Affairs Healthcare System (MVAHCS), Minneapolis, MN
| | - M Driscoll
- VA Connecticut Healthcare System, West Haven, CT
- Yale School of Medicine, New Haven, CT
| | - R Evans
- Integrative Health & Wellbeing Research Program, Bakken Center for Spirituality & Healing, University of Minnesota, Minneapolis, MN
- University of Minnesota School of Nursing, Minneapolis, MN
| | - J E Ferguson
- University of Minnesota Medical School, Minneapolis, MN
| | - A Haley
- Integrative Health & Wellbeing Research Program, Bakken Center for Spirituality & Healing, University of Minnesota, Minneapolis, MN
- University of Minnesota School of Nursing, Minneapolis, MN
| | - S Hennessy
- Center for Care Delivery and Outcomes Research, Minneapolis Veterans Affairs Healthcare System (MVAHCS), Minneapolis, MN
| | - L A Meis
- Center for Care Delivery and Outcomes Research, Minneapolis Veterans Affairs Healthcare System (MVAHCS), Minneapolis, MN
- University of Minnesota Medical School, Minneapolis, MN
- Women's Health Sciences Division, National Center for PTSD, Boston, MA
| | - D J Burgess
- Center for Care Delivery and Outcomes Research, Minneapolis Veterans Affairs Healthcare System (MVAHCS), Minneapolis, MN
- University of Minnesota Medical School, Minneapolis, MN
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2
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Phillips P, Lithgow GJ, Driscoll M. REPRODUCIBILITY & ROBUSTNESS IN PURSUING LIFE-EXTENDING COMPOUNDS: CAENORHABDITIS INTERVENTION TESTING PROGRAM. Innov Aging 2018. [DOI: 10.1093/geroni/igy023.3009] [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] [Indexed: 11/13/2022] Open
Affiliation(s)
- P Phillips
- Department of Biology, University of Oregon, Eugene, Oregon, United States
| | - G J Lithgow
- Buck Institute for Aging Research, Novato, California 94945, USA
| | - M Driscoll
- Rutgers University, Piscataway, New Jersey 08854, USA
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3
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Tang WW, McGee P, Lachin JM, Li DY, Hoogwerf B, Hazen SL, Nathan D, Zinman B, Crofford O, Genuth S, Brown‐Friday J, Crandall J, Engel H, Engel S, Martinez H, Phillips M, Reid M, Shamoon H, Sheindlin J, Gubitosi‐Klug R, Mayer L, Pendegast S, Zegarra H, Miller D, Singerman L, Smith‐Brewer S, Novak M, Quin J, Genuth S, Palmert M, Brown E, McConnell J, Pugsley P, Crawford P, Dahms W, Gregory N, Lackaye M, Kiss S, Chan R, Orlin A, Rubin M, Brillon D, Reppucci V, Lee T, Heinemann M, Chang S, Levy B, Jovanovic L, Richardson M, Bosco B, Dwoskin A, Hanna R, Barron S, Campbell R, Bhan A, Kruger D, Jones J, Edwards P, Bhan A, Carey J, Angus E, Thomas A, Galprin A, McLellan M, Whitehouse F, Bergenstal R, Johnson M, Gunyou K, Thomas L, Laechelt J, Hollander P, Spencer M, Kendall D, Cuddihy R, Callahan P, List S, Gott J, Rude N, Olson B, Franz M, Castle G, Birk R, Nelson J, Freking D, Gill L, Mestrezat W, Etzwiler D, Morgan K, Aiello L, Golden E, Arrigg P, Asuquo V, Beaser R, Bestourous L, Cavallerano J, Cavicchi R, Ganda O, Hamdy O, Kirby R, Murtha T, Schlossman D, Shah S, Sharuk G, Silva P, Silver P, Stockman M, Sun J, Weimann E, Wolpert H, Aiello L, Jacobson A, Rand L, Rosenzwieg J, Nathan D, Larkin M, Christofi M, Folino K, Godine J, Lou P, Stevens C, Anderson E, Bode H, Brink S, Cornish C, Cros D, Delahanty L, eManbey ., Haggan C, Lynch J, McKitrick C, Norman D, Moore D, Ong M, Taylor C, Zimbler D, Crowell S, Fritz S, Hansen K, Gauthier‐Kelly C, Service F, Ziegler G, Barkmeier A, Schmidt L, French B, Woodwick R, Rizza R, Schwenk W, Haymond M, Pach J, Mortenson J, Zimmerman B, Lucas A, Colligan R, Luttrell L, Lopes‐Virella M, Caulder S, Pittman C, Patel N, Lee K, Nutaitis M, Fernandes J, Hermayer K, Kwon S, Blevins A, Parker J, Colwell J, Lee D, Soule J, Lindsey P, Bracey M, Farr A, Elsing S, Thompson T, Selby J, Lyons T, Yacoub‐Wasef S, Szpiech M, Wood D, Mayfield R, Molitch M, Adelman D, Colson S, Jampol L, Lyon A, Gill M, Strugula Z, Kaminski L, Mirza R, Simjanoski E, Ryan D, Johnson C, Wallia A, Ajroud‐Driss S, Astelford P, Leloudes N, Degillio A, Schaefer B, Mudaliar S, Lorenzi G, Goldbaum M, Jones K, Prince M, Swenson M, Grant I, Reed R, Lyon R, Kolterman O, Giotta M, Clark T, Friedenberg G, Sivitz W, Vittetoe B, Kramer J, Bayless M, Zeitler R, Schrott H, Olson N, Snetselaar L, Hoffman R, MacIndoe J, Weingeist T, Fountain C, Miller R, Johnsonbaugh S, Patronas M, Carney M, Mendley S, Salemi P, Liss R, Hebdon M, Counts D, Donner T, Gordon J, Hemady R, Kowarski A, Ostrowski D, Steidl S, Jones B, Herman W, Martin C, Pop‐Busui R, Greene D, Stevens M, Burkhart N, Sandford T, Floyd J, Bantle J, Flaherty N, Terry J, Koozekanani D, Montezuma S, Wimmergren N, Rogness B, Mech M, Strand T, Olson J, McKenzie L, Kwong C, Goetz F, Warhol R, Hainsworth D, Goldstein D, Hitt S, Giangiacomo J, Schade D, Canady J, Burge M, Das A, Avery R, Ketai L, Chapin J, Schluter M, Rich J, Johannes C, Hornbeck D, Schutta M, Bourne P, Brucker A, Braunstein S, Schwartz S, Maschak‐Carey B, Baker L, Orchard T, Cimino L, Songer T, Doft B, Olson S, Becker D, Rubinstein D, Bergren R, Fruit J, Hyre R, Palmer C, Silvers N, Lobes L, Rath PP, Conrad P, Yalamanchi S, Wesche J, Bratkowksi M, Arslanian S, Rinkoff J, Warnicki J, Curtin D, Steinberg D, Vagstad G, Harris R, Steranchak L, Arch J, Kelly K, Ostrosaka P, Guiliani M, Good M, Williams T, Olsen K, Campbell A, Shipe C, Conwit R, Finegold D, Zaucha M, Drash A, Morrison A, Malone J, Bernal M, Pavan P, Grove N, Tanaka E, McMillan D, Vaccaro‐Kish J, Babbione L, Solc H, DeClue T, Dagogo‐Jack S, Wigley C, Ricks H, Kitabchi A, Chaum E, Murphy M, Moser S, Meyer D, Iannacone A, Yoser S, Bryer‐Ash M, Schussler S, Lambeth H, Raskin P, Strowig S, Basco M, Cercone S, Zinman B, Barnie A, Devenyi R, Mandelcorn M, Brent M, Rogers S, Gordon A, Bakshi N, Perkins B, Tuason L, Perdikaris F, Ehrlich R, Daneman D, Perlman K, Ferguson S, Palmer J, Fahlstrom R, de Boer I, Kinyoun J, Van Ottingham L, Catton S, Ginsberg J, McDonald C, Harth J, Driscoll M, Sheidow T, Mahon J, Canny C, Nicolle D, Colby P, Dupre J, Hramiak I, Rodger N, Jenner M, Smith T, Brown W, May M, Lipps Hagan J, Agarwal A, Adkins T, Lorenz R, Feman S, Survant L, White N, Levandoski L, Grand G, Thomas M, Joseph D, Blinder K, Shah G, Burgess D, Boniuk I, Santiago J, Tamborlane W, Gatcomb P, Stoessel K, Ramos P, Fong K, Ossorio P, Ahern J, Gubitosi‐Klug R, Meadema‐Mayer L, Beck C, Farrell K, Genuth S, Quin J, Gaston P, Palmert M, Trail R, Dahms W, Lachin J, Backlund J, Bebu I, Braffett B, Diminick L, Gao X, Hsu W, Klumpp K, Pan H, Trapani V, Cleary P, McGee P, Sun W, Villavicencio S, Anderson K, Dews L, Younes N, Rutledge B, Chan K, Rosenberg D, Petty B, Determan A, Kenny D, Williams C, Cowie C, Siebert C, Steffes M, Arends V, Bucksa J, Nowicki M, Chavers B, O'Leary D, Polak J, Harrington A, Funk L, Crow R, Gloeb B, Thomas S, O'Donnell C, Soliman E, Zhang Z, Li Y, Campbell C, Keasler L, Hensley S, Hu J, Barr M, Taylor T, Prineas R, Feldman E, Albers J, Low P, Sommer C, Nickander K, Speigelberg T, Pfiefer M, Schumer M, Moran M, Farquhar J, Ryan C, Sandstrom D, Williams T, Geckle M, Cupelli E, Thoma F, Burzuk B, Woodfill T, Danis R, Blodi B, Lawrence D, Wabers H, Gangaputra S, Neill S, Burger M, Dingledine J, Gama V, Sussman R, Davis M, Hubbard L, Budoff M, Darabian S, Rezaeian P, Wong N, Fox M, Oudiz R, Kim L, Detrano R, Cruickshanks K, Dalton D, Bainbridge K, Lima J, Bluemke D, Turkbey E, der Geest ., Liu C, Malayeri A, Jain A, Miao C, Chahal H, Jarboe R, Nathan D, Monnier V, Sell D, Strauch C, Hazen S, Pratt A, Tang W, Brunzell J, Purnell J, Natarajan R, Miao F, Zhang L, Chen Z, Paterson A, Boright A, Bull S, Sun L, Scherer S, Lopes‐Virella M, Lyons T, Jenkins A, Klein R, Virella G, Jaffa A, Carter R, Stoner J, Garvey W, Lackland D, Brabham M, McGee D, Zheng D, Mayfield R, Maynard J, Wessells H, Sarma A, Jacobson A, Dunn R, Holt S, Hotaling J, Kim C, Clemens Q, Brown J, McVary K. Oxidative Stress and Cardiovascular Risk in Type 1 Diabetes Mellitus: Insights From the DCCT/EDIC Study. J Am Heart Assoc 2018. [PMCID: PMC6015340 DOI: 10.1161/jaha.117.008368] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Background
Hyperglycemia leading to increased oxidative stress is implicated in the increased risk for the development of macrovascular and microvascular complications in patients with type 1 diabetes mellitus.
Methods and Results
A random subcohort of 349 participants was selected from the
DCCT
/
EDIC
(Diabetes Control and Complications Trial/Epidemiology of Diabetes Interventions and Complications) cohort. This included 320 controls and 29 cardiovascular disease cases that were augmented with 98 additional known cases to yield a case cohort of 447 participants (320 controls, 127 cases). Biosamples from
DCCT
baseline, year 1, and closeout of
DCCT
, and 1 to 2 years post‐
DCCT
(
EDIC
years 1 and 2) were measured for markers of oxidative stress, including plasma myeloperoxidase, paraoxonase activity, urinary F
2α
isoprostanes, and its metabolite, 2,3 dinor‐8
iso
prostaglandin F
2α
. Following adjustment for glycated hemoblobin and weighting the observations inversely proportional to the sampling selection probabilities, higher paraoxonase activity, reflective of antioxidant activity, and 2,3 dinor‐8
iso
prostaglandin F
2α
, an oxidative marker, were significantly associated with lower risk of cardiovascular disease (−4.5% risk for 10% higher paraoxonase,
P
<0.003; −5.3% risk for 10% higher 2,3 dinor‐8
iso
prostaglandin F
2α
,
P
=0.0092). In contrast, the oxidative markers myeloperoxidase and F
2α
isoprostanes were not significantly associated with cardiovascular disease after adjustment for glycated hemoblobin. There were no significant differences between
DCCT
intensive and conventional treatment groups in the change in all biomarkers across time segments.
Conclusions
Heightened antioxidant activity (rather than diminished oxidative stress markers) is associated with lower cardiovascular disease risk in type 1 diabetes mellitus, but these biomarkers did not change over time with intensification of glycemic control.
Clinical Trial Registration
URL
:
https://www.clinicaltrials.gov
. Unique identifiers:
NCT
00360815 and
NCT
00360893.
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Affiliation(s)
- W.H. Wilson Tang
- Department of Cellular and Molecular Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, OH
- Department of Cardiovascular Medicine, Heart and Vascular Institute, Cleveland Clinic, Cleveland, OH
| | - Paula McGee
- The Biostatistics Center, George Washington University, Rockville, MD
| | - John M. Lachin
- The Biostatistics Center, George Washington University, Rockville, MD
| | - Daniel Y. Li
- Department of Cellular and Molecular Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, OH
| | | | - Stanley L. Hazen
- Department of Cellular and Molecular Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, OH
- Department of Cardiovascular Medicine, Heart and Vascular Institute, Cleveland Clinic, Cleveland, OH
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Driscoll M, Ramsay CM, Hulse G, Simpson WJ. A Method of Detecting Autolysis of Brewers' Yeast by Measurement of Extracellular Adenylate Kinase Activity. Journal of the American Society of Brewing Chemists 2018. [DOI: 10.1094/asbcj-60-0176] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
| | | | - G. Hulse
- South African Breweries, Beer Division, Sandton, South Africa
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5
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Lucanic M, Guo M, Lithgow G, Driscoll M, Phillips P. CITP: SCREENING CHEMICALS FOR REPRODUCIBLE AND ROBUST EFFECTS ACROSS DIVERSE GENETIC BACKGROUNDS. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.4490] [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] [Indexed: 11/15/2022] Open
Affiliation(s)
- M. Lucanic
- Buck Institute for Research on Aging, Novato, California,
| | - M. Guo
- Division of Aging Biology, National Institute on Aging, Bethesda, Maryland,
| | - G.J. Lithgow
- Buck Institute for Research on Aging, Novato, California,
| | - M. Driscoll
- Rutgers University, Dept. of Molecular Biology and Biochemistry, Nelson Biological Laboratories, Piscataway, New Jersey,
| | - P. Phillips
- Institute of Ecology and Evolution, University of Oregon, Eugene, Oregon
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6
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Altalib HH, Fenton BT, Sico J, Goulet JL, Bathulapalli H, Mohammad A, Kulas J, Driscoll M, Dziura J, Mattocks K, Kerns R, Brandt C, Haskell S. Increase in migraine diagnoses and guideline-concordant treatment in veterans, 2004-2012. Cephalalgia 2016; 37:3-10. [PMID: 26950804 DOI: 10.1177/0333102416631959] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Background and aim Health administrators, policy makers, and educators have attempted to increase guideline adherence of migraine medications while reducing inappropriate use of opioid- and barbiturate-containing medications. We evaluated the burden of migraine and proportion of guideline-concordant care in a large, national health care system over time. Methods We conducted a time-series study using data from the Veterans Health Administration (VHA) electronic health record. Veterans with migraines were identified by ICD-9 code (346.X). Prescriptions and comorbid conditions were evaluated before and after migraine diagnosis. Chi-square tests and logistic regression were performed. Results A total of 57,064 veterans were diagnosed with migraine headache (5.3%), with women significantly more likely diagnosed (11.6% vs. 4.4%, p < 0.0001). The number of veterans diagnosed with migraine has significantly increased over the years. By 2012, triptans were prescribed to 43% of people with migraine, with no difference by gender. However, triptan prescriptions increased from 2004 to 2012 in men, but not women, veterans. Preventive medicines showed a significant increase with the year of migraine diagnosis, after controlling for age, sex, race, and for comorbidities treated with medications used for migraine prevention. Conclusions The burden of migraines is increasing within the VHA, with a corresponding increase in the delivery of guideline-concordant acute and prophylactic migraine-specific medication.
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Affiliation(s)
- H H Altalib
- 1 Pain Research, Informatics, Multimorbidities, and Education (PRIME) Center, VA Connecticut Healthcare System, USA.,2 Yale University, Department of Neurology, USA.,3 Yale University, Department of Psychiatry, USA
| | - B T Fenton
- 1 Pain Research, Informatics, Multimorbidities, and Education (PRIME) Center, VA Connecticut Healthcare System, USA
| | - J Sico
- 1 Pain Research, Informatics, Multimorbidities, and Education (PRIME) Center, VA Connecticut Healthcare System, USA.,2 Yale University, Department of Neurology, USA
| | - J L Goulet
- 1 Pain Research, Informatics, Multimorbidities, and Education (PRIME) Center, VA Connecticut Healthcare System, USA.,3 Yale University, Department of Psychiatry, USA
| | - H Bathulapalli
- 1 Pain Research, Informatics, Multimorbidities, and Education (PRIME) Center, VA Connecticut Healthcare System, USA
| | - A Mohammad
- 1 Pain Research, Informatics, Multimorbidities, and Education (PRIME) Center, VA Connecticut Healthcare System, USA.,4 Yale University, Department of Internal Medicine, USA
| | - J Kulas
- 1 Pain Research, Informatics, Multimorbidities, and Education (PRIME) Center, VA Connecticut Healthcare System, USA.,3 Yale University, Department of Psychiatry, USA
| | - M Driscoll
- 1 Pain Research, Informatics, Multimorbidities, and Education (PRIME) Center, VA Connecticut Healthcare System, USA.,3 Yale University, Department of Psychiatry, USA
| | - J Dziura
- 1 Pain Research, Informatics, Multimorbidities, and Education (PRIME) Center, VA Connecticut Healthcare System, USA.,5 Yale University, Department of Emergency Medicine, USA
| | - K Mattocks
- 6 VA Central Western Massachusetts Healthcare System, USA.,7 University of Massachusetts Medical School, Department of Quantitative Health Science, USA
| | - R Kerns
- 1 Pain Research, Informatics, Multimorbidities, and Education (PRIME) Center, VA Connecticut Healthcare System, USA.,2 Yale University, Department of Neurology, USA.,3 Yale University, Department of Psychiatry, USA
| | - C Brandt
- 1 Pain Research, Informatics, Multimorbidities, and Education (PRIME) Center, VA Connecticut Healthcare System, USA.,5 Yale University, Department of Emergency Medicine, USA
| | - S Haskell
- 1 Pain Research, Informatics, Multimorbidities, and Education (PRIME) Center, VA Connecticut Healthcare System, USA.,4 Yale University, Department of Internal Medicine, USA
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7
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Martin A, Heapy A, Moore B, Masheb R, Driscoll M, Kerns R. (513) A mediation model of neuropathic pain and sleep quality: the role of depressed affect and pain interference. The Journal of Pain 2014. [DOI: 10.1016/j.jpain.2014.01.425] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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8
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Driscoll M, Higgins D, Elizabeth S, Goulet J, Heapy A, Kerns R, Brandt C, Haskell S. (520) Trauma type, social support, and pain in veterans: does gender matter? The Journal of Pain 2014. [DOI: 10.1016/j.jpain.2014.01.432] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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9
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Zhang W, Bianchi L, Lee WH, Wang Y, Israel S, Driscoll M. Intersubunit interactions between mutant DEG/ENaCs induce synthetic neurotoxicity. Cell Death Differ 2008; 15:1794-803. [PMID: 18670436 DOI: 10.1038/cdd.2008.114] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Ion channel hyperactivation can result in neuronal loss in injury, stroke and neurodegenerative disease. Acidosis-associated hyperactivation of the Degenerin/epithelial amiloride-sensitive Na(+) channel (DEG/ENaC) acid-sensing ion channel 1a (ASIC1a), a proton-gated channel expressed in the mammalian brain, contributes significantly to neuronal loss in ischemia. Analogously, in invertebrates, genetic hyperactivation of the Caenorhabditis elegans mechanosensory (MEC) channel (MEC-4(d)) of the DEG/ENaC ion channel superfamily induces neuronal necrosis. Similarly substituted MEC-10(d) mutant subunits of the same MEC channel are only marginally neurotoxic, and we therefore exploited the weak necrosis phenotype of mec-10(d) lines to screen for novel extragenic mutations that enhance neuronal death. Here, we report on one mec-10(d) necrosis enhancer, which we show is MEC-4 variant MEC-4(A149V). MEC-4(A149V) executes normal MEC-4 function in touch sensation and does not induce necrosis on its own, but rather combines with MEC-10(d) to create a strongly neurotoxic channel. The MEC-4(A149V)+MEC-10(d) channel conducts elevated Na(+) and Ca(2+) currents (with a disproportionate increase in Ca(2+) current) in the Xenopus oocyte expression system, and exhibits altered binding of the channel inhibitor amiloride. Our data document the first example of synergistically toxic intersubunit interactions in the DEG/ENaC channel class and provide evidence that Ca(2+) current levels may be decisive factors in tipping the balance between neuronal survival and necrosis.
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Affiliation(s)
- W Zhang
- Department of Molecular Biology and Biochemistry, Rutgers University, Piscataway, NJ 08854, USA
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10
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Potter K, Abedini A, Butterworth S, Driscoll M, Marek P, Baker R, Korbutt GS, Fraser PE, Raleigh DP, Verchere CB. SPECIES-SPECIFIC SEQUENCE VARIATION OF PORCINE ISLET AMYLOID POLYPEPTIDE REDUCES ITS AMYLOIDOGENICITY AND MAY CONTRIBUTE TO IMPROVED FUNCTION AND SURVIVAL OF PIG ISLET XENOGRAFTS. CLIN INVEST MED 2008. [DOI: 10.25011/cim.v31i4.4823] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Introduction: Long-term success of human islet transplants has been limited. Beta cell mass and function in transplanted islets progressively decline over time, resembling the progressive loss of insulin secretion in type2 diabetes. Transplanted islets, like those in type 2 diabetes, are subject to apoptotic beta cell death and the formation of toxic aggregates of the betacell peptide islet amyloid polypeptide (IAPP). Interestingly, porcine islets consistently maintain long-term normoglycemia when transplanted into immune-deficient, diabetic mice. We hypothesized that transplanted pig islets may not be subject to amyloid formation and amyloid-induced cell death, and that this may contribute to the success of porcine islet grafts.
Methods & Results: Sequencing of porcine IAPP (pIAPP) from neonatal pig islet (NPI)-extracted RNA confirmed notabledifferences from human IAPP (hIAPP), including a proline substitution within the known amyloidogenic region and a glutamine-for-lysine at the N-terminalcleavage site of porcine proIAPP. Fibril formation was assessed by electron miscroscopy (EM) and Thioflavin T fluorescence. While synthetic hIAPP fibrillized within minutes, pIAPP required 6 weeks to form fibrils detectableby EM. Small peptide fragments of pIAPP failed to aggregate. By Thioflavin T fluorescence assay, hIAPP (40 µM) had an average lag time of 1 h and a 1,000-fold increase in fluorescence by 2 h while pIAPP showed little increase in fluorescence after 20 h. Small peptide fragments of pIAPP also failed to aggregate. hIAPP was significantly more toxic to INS-1 cells than pIAPP (20-200 µM), asassessed by TUNEL (16 h) and Alamar blue (24 h). We also failed to detect amyloid in any (0/9) NPI transplanted into streptozotocin diabetic murine recipients, while human islets had extensive amyloid deposition by 8 weeks post-transplant, associated with graft failure.
Conclusion: Porcine IAPP, unlike human IAPP, is only weakly amyloidogenic and cytotoxic. We speculate that decreased fibrillogenicity of porcine compared to human IAPP may underlie the apparent enhanced survival andfunction of pig islet xenografts.
KJP is supported by aChild & Family – Rx & D & CIHR – UBC MD PhD Studentship and a MichaelSmith Foundation for Health Research Junior Trainee Award.
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11
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Abstract
Genetic studies of the nematode Caenorhabditis elegans have uncovered four genes, egl-1 (BH3 only), ced-9 (Bcl-2 related), ced-4 (apoptosis protease activating factor-1), and ced-3 (caspase), which function in a linear pathway to promote developmental cell death in this organism. While this core pathway functions in many cells, recent studies suggest that additional regulators, acting on or in lieu of these core genes, can promote or inhibit the onset of cell death. Here, we discuss the evidence for these noncanonical mechanisms of C. elegans cell death control. We consider novel modes for regulating the core apoptosis genes, and describe a newly identified cell death pathway independent of all known C. elegans cell death genes. The existence of these noncanonical cell death programs suggests that organisms have evolved multiple ways to ensure appropriate cellular demise during development.
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Affiliation(s)
- E S Blum
- Laboratory of Developmental Genetics, The Rockefeller University, New York, NY 10065, USA
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12
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Potter K, Abedini A, Baker R, Butterworth S, Driscoll M, Marek P, Korbutt G, Fraser P, Raleigh D, Verchere C. Lack of amyloidogenicity and altered prohormone processing of porcine islet amyloid polypeptide may promote function and survival of pig islet xenografts. Can J Diabetes 2008. [DOI: 10.1016/s1499-2671(08)24259-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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13
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Jazwinski SM, Warner HR, Helfand S, Driscoll M, Welsh DA, Faulkner J, Barzilai N, Breitenbach M, McCarter R, Brown WT, Greco N, Mountz J, Olshansky SJ. The Biological Sciences Section Program at the 57th Annual Meeting of The Gerontological Society of America. J Gerontol A Biol Sci Med Sci 2005. [DOI: 10.1093/gerona/60.11.1359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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14
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Abstract
One of the looming mysteries in signal transduction today is the question of how mechanical signals, such as pressure or mechanical force delivered to a cell, are interpreted to direct biological responses. All living organisms, and probably all cells, have the ability to sense and respond to mechanical stimuli. At the single-cell level, mechanical signaling underlies cell-volume control and specialized responses such as the prevention of poly-spermy in fertilization. At the level of the whole organism, mechanotransduction underlies processes as diverse as stretch-activated reflexes in vascular epithelium and smooth muscle; gravitaxis and turgor control in plants; tissue development and morphogenesis; and the senses of touch, hearing, and balance. Intense genetic, molecular, and elecrophysiological studies in organisms ranging from nematodes to mammals have highlighted members of the recently discovered DEG/ENaC family of ion channels as strong candidates for the elusive metazoan mechanotransducer. Here, we discuss the evidence that links DEG/ENaC ion channels to mechanotransduction and review the function of Caenorhabditis elegans members of this family called degenerins and their role in mediating mechanosensitive behaviors in the worm.
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Affiliation(s)
- N Tavernarakis
- Department of Molecular Biology and Biochemistry, Rutgers, The State University of New Jersey, New Brunswick, USA.
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15
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Xu K, Tavernarakis N, Driscoll M. Necrotic cell death in C. elegans requires the function of calreticulin and regulators of Ca(2+) release from the endoplasmic reticulum. Neuron 2001; 31:957-71. [PMID: 11580896 DOI: 10.1016/s0896-6273(01)00432-9] [Citation(s) in RCA: 218] [Impact Index Per Article: 9.5] [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] [Indexed: 10/26/2022]
Abstract
In C. elegans, a hyperactivated MEC-4(d) ion channel induces necrotic-like neuronal death that is distinct from apoptosis. We report that null mutations in calreticulin suppress both mec-4(d)-induced cell death and the necrotic cell death induced by expression of a constitutively activated Galpha(S) subunit. RNAi-mediated knockdown of calnexin, mutations in the ER Ca(2+) release channels unc-68 (ryanodine receptor) or itr-1 (inositol 1,4,5 triphosphate receptor), and pharmacological manipulations that block ER Ca(2+) release also suppress death. Conversely, thapsigargin-induced ER Ca(2+) release can restore mec-4(d)-induced cell death when calreticulin is absent. We conclude that high [Ca(2+)](i) is a requirement for necrosis in C. elegans and suggest that an essential step in the death mechanism is release of ER-based Ca(2+) stores. ER-driven Ca(2+) release has previously been implicated in mammalian necrosis, suggesting necrotic death mechanisms may be conserved.
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Affiliation(s)
- K Xu
- Department of Molecular Biology and Biochemistry, A232, Nelson Biological Laboratories, Rutgers, The State University of New Jersey, 604 Allison Road, Piscataway, NJ 08855, USA
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16
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Tavernarakis N, Driscoll M. Degenerins. At the core of the metazoan mechanotransducer? Ann N Y Acad Sci 2001; 940:28-41. [PMID: 11458685] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
Abstract
Mechanosensory signaling, believed to be mediated by mechanically gated ion channels, constitutes the basis for the senses of touch and hearing, and contributes fundamentally to the development and homeostasis of all organisms. Despite this profound importance in biology, little is known of the molecular identities or functional requirements of mechanically gated ion channels. Genetic analyses of touch sensation and locomotion in Caenorhabditis elegans have implicated a new class of ion channels, the degenerins (DEG) in nematode mechanotransduction. Related fly and vertebrate proteins, the epithelial sodium channel (ENaC) family, have been implicated in several important processes, including transduction of mechanical stimuli, pain sensation, gametogenesis, sodium reabsorption, and blood pressure regulation. Still-to-be-discovered DEG/ENaC proteins may compose the core of the elusive human mechanotransducer.
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Affiliation(s)
- N Tavernarakis
- Department of Molecular Biology and Biochemistry, Rutgers, State University of New Jersey, Piscataway, New Jersey 08855, USA.
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17
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Tavernarakis N, Everett JK, Kyrpides NC, Driscoll M. Structural and functional features of the intracellular amino terminus of DEG/ENaC ion channels. Curr Biol 2001; 11:R205-8. [PMID: 11301263 DOI: 10.1016/s0960-9822(01)00106-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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18
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Abstract
The nematode Caenorhabditis elegans has been shown to be an excellent model organism with which to study the mechanisms of programmed cell death because of its powerful genetics and the ability to study cell death with single-cell resolution. In this chapter, we describe methods that are commonly used to examine various aspects of programmed cell death in C. elegans. These methods, in combination with genetic analyses, have helped identify and characterize many components of the C. elegans cell death pathway, illuminating the mechanisms by which these components affect programmed cell death.
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Affiliation(s)
- D Ledwich
- Department of Molecular, Cellular, and Developmental Biology, University of Colorado at Boulder 80309-0437, USA
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19
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Chung S, Gumienny TL, Hengartner MO, Driscoll M. A common set of engulfment genes mediates removal of both apoptotic and necrotic cell corpses in C. elegans. Nat Cell Biol 2000; 2:931-7. [PMID: 11146658 DOI: 10.1038/35046585] [Citation(s) in RCA: 134] [Impact Index Per Article: 5.6] [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] [Indexed: 01/12/2023]
Abstract
Similar to mammalian excitotoxic cell death, necrotic-like cell death (NCD) in Caenorhabditis elegans can be initiated by hyperactive ion channels. Here we investigate the requirements for genes that execute and regulate programmed cell death (PCD) in necrotic-like neuronal death caused by a toxic MEC-4 channel. Neither the kinetics of necrosis onset nor the total number of necrotic corpses generated is altered by any C. elegans mutation known to block PCD, which provides genetic evidence that the activating mechanisms for NCD and apoptotic cell death are distinct. In contrast, all previously reported ced genes required for phagocytotic removal of apoptotic corpses, as well as ced-12, a new engulfment gene we have identified, are required for efficient elimination of corpses generated by distinct necrosis-inducing stimuli. Our results show that a common set of genes acts to eliminate cell corpses irrespective of the mode of cell death, and provide the first identification of the C. elegans genes that are required for orderly removal of necrotic cells. As phagocytotic mechanisms seem to be conserved from nematodes to humans, our findings indicate that injured necrotic cells in higher organisms might also be eliminated before lysis through a controlled process of corpse removal, a hypothesis that has significant therapeutic implications.
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Affiliation(s)
- S Chung
- Department of Molecular Biology and Biochemistry, Nelson Biological Laboratories, Rutgers University, 604 Allison Road, Piscataway, New Jersey 08854, USA
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20
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21
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Panter AT, Huba GJ, Melchior LA, Anderson D, Driscoll M, Rohweder C, Henderson H, Henderson R, Zalumas J. Healthcare provider characteristics and perceived confidence from HIV/AIDS education. AIDS Patient Care STDS 2000; 14:603-14. [PMID: 11155902 DOI: 10.1089/10872910050193789] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
This study reports findings from six training projects designed to keep health providers up-to-date on emerging developments and approaches in HIV/AIDS care. Participants were 3,779 individuals who described themselves, their professional background, and their specific experience in the HIV/AIDS field. These characteristics were compared with their self-reported confidence in managing clients, counseling clients, providing services, and the training topics. A repeated-measures design examining level and change of confidence showed little support for links between provider characteristics and confidence due to HIV/AIDS training experience. Thus, knowing a provider's background does not necessarily provide diagnostic information about who might most benefit in improved confidence from HIV/AIDS educational training. These results suggest that HIV/AIDS training programs may be targeted broadly-to a wide range of healthcare providers of diverse backgrounds-with little or no impact on overall levels and changes in provider confidence.
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Affiliation(s)
- A T Panter
- University of North Carolina, Chapel Hill, USA.
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22
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Huba GJ, Panter AT, Melchior LA, Zalumas J, Uldall KK, Henderson R, Henderson H, German VF, Driscoll M, Anderson D, Lalonde B. Do characteristics of HIV/AIDS education and training affect perceived training quality? Lessons from the evaluation of seven projects. AIDS Educ Prev 2000; 12:455-476. [PMID: 11063064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Initial and continuing HIV/AIDS education and training has been a critical way to bring the nation's health providers up to date on emerging developments and approaches. This study reports cross-cutting findings from seven HIV/AIDS education and training projects. Trainers described over 600 training sessions from these projects in terms of their structural characteristics and design elements, while trainees described these sessions on several dimensions related to training quality. Training characteristics were compared to trainee assessments of training quality. Using a decision-tree analytic approach for major training attributes, considerable support emerged for links between training characteristics and perceived quality of the HIV/AIDS training experience. More favorable quality ratings were associated with certain projects, the training setting, the types of trainees served by the training, the intended training impact, discussion of special populations, and training methods involving interactive learning. With increased knowledge regarding how these educational experiences relate to the ways they are perceived and processed, more targeted approaches to training design on HIV/AIDS can be developed.
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Affiliation(s)
- G J Huba
- The Measurement Group, Culver City, California 90230, USA.
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23
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Affiliation(s)
- L A Herndon
- Department of Molecular Biology and Biochemistry, Nelson Biological Laboratories, Rutgers University, Piscataway, NJ 08854, USA
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24
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Panter AT, Huba GJ, Melchior LA, Anderson D, Driscoll M, German VF, Henderson H, Henderson R, Lalonde B, Uldall KK, Zalumas J. Trainee characteristics and perceptions of HIV/AIDS training quality. Eval Health Prof 2000; 23:149-71. [PMID: 10947522 DOI: 10.1177/016327870002300202] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
HIV/AIDS education and training have played a vital role in keeping health providers up to date on emerging developments and approaches. This study reports findings from seven HIV/AIDS education and training projects. Participants in more than 600 training sessions described themselves, their professional background, and their general reasons for taking the training. Immediately following the training, they also rated the quality of their educational experience along several dimensions. Trainee characteristics were related to assessments of training quality, using a regression decision-tree analytic approach. Although effect sizes were generally small, quality ratings of the HIV/AIDS training experiences were associated with certain projects, basic trainee demographic characteristics, professional background, and experience in the HIV field. Greater understanding about participant characteristics can provide clues about how these training experiences are perceived and processed and may inform decision making about instructional HIV/AIDS curricula.
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Affiliation(s)
- A T Panter
- University of North Carolina, Chapel Hill, USA.
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25
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Huba GJ, Panter AT, Melchior LA, Anderson D, Colgrove J, Driscoll M, German VF, Henderson H, Henderson R, Lalonde B, Rahimian A, Rohweder C, Uldall KK, Wolfe L, Zalumas J. Effects of HIV/AIDS education and training on patient care and provider practices: a cross-cutting evaluation. AIDS Educ Prev 2000; 12:93-112. [PMID: 10833036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Initial and continuing training in HIV/AIDS service provision is a critical way to enable the nation's health providers to use state-of-the-art developments and perspectives. Typically, the efficacy of HIV/AIDS training programs is evaluated using assessments administered to trainees immediately following the training. This study reports cross-cutting findings from telephone interviews conducted with 218 trainees an average of 8 months after training. Long-term training effects are examined in three domains: (a) general perspectives on HIV/AIDS; (b) health care provider service provision; and (c) changes in procedures and operations at the health care system level. The findings show the different ways that the training experience had long-term positive and observable effects in these three domains. In some cases, background characteristics and job positions predicted the specific type of reported training effects. The pattern of results suggests ways in which training methods can be targeted to specific audiences.
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Affiliation(s)
- G J Huba
- The Measurement Group, Culver City, CA 90230, USA.
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26
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Hong K, Mano I, Driscoll M. In vivo structure-function analyses of Caenorhabditis elegans MEC-4, a candidate mechanosensory ion channel subunit. J Neurosci 2000; 20:2575-88. [PMID: 10729338 PMCID: PMC6772260] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/1999] [Revised: 01/19/2000] [Accepted: 01/26/2000] [Indexed: 02/15/2023] Open
Abstract
Mechanosensory signaling mediated by mechanically gated ion channels constitutes the basis for the senses of touch and hearing and contributes fundamentally to the development and homeostasis of all organisms. Despite this profound importance in biology, little is known of the molecular identities or functional requirements of mechanically gated ion channels. We report a genetically based structure-function analysis of the candidate mechanotransducing channel subunit MEC-4, a core component of a touch-sensing complex in Caenorhabditis elegans and a member of the DEG/ENaC superfamily. We identify molecular lesions in 40 EMS-induced mec-4 alleles and further probe residue and domain function using site-directed approaches. Our analysis highlights residues and subdomains critical for MEC-4 activity and suggests possible roles of these in channel assembly and/or function. We describe a class of substitutions that disrupt normal channel activity in touch transduction but remain permissive for neurotoxic channel hyperactivation, and we show that expression of an N-terminal MEC-4 fragment interferes with in vivo channel function. These data advance working models for the MEC-4 mechanotransducing channel and identify residues, unique to MEC-4 or the MEC-4 degenerin subfamily, that might be specifically required for mechanotransducing function. Because many other substitutions identified by our study affect residues conserved within the DEG/ENaC channel superfamily, this work also provides a broad view of structure-function relations in the superfamily as a whole. Because the C. elegans genome encodes representatives of a large number of eukaryotic channel classes, we suggest that similar genetic-based structure-activity studies might be generally applied to generate insight into the in vivo function of diverse channel types.
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Affiliation(s)
- K Hong
- Department of Molecular Biology and Biochemistry, Rutgers, The State University of New Jersey, Piscataway, New Jersey 08854, USA
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27
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Fricke B, Lints R, Stewart G, Drummond H, Dodt G, Driscoll M, von Düring M. Epithelial Na+ channels and stomatin are expressed in rat trigeminal mechanosensory neurons. Cell Tissue Res 2000; 299:327-34. [PMID: 10772247 DOI: 10.1007/s004419900153] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.2] [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: 11/26/2022]
Abstract
Caenorhabditis elegans MEC-4 and MEC-10 are subunits of the degenerin/epithelial Na+ channel (DEG/ENaC) ion channel superfamily thought to be associated with MEC-2 (a stomatin-like protein) in a mechanotransducing molecular complex in specialized touch sensory neurons. A key question is whether analogous molecular complexes in higher organisms transduce mechanical signals. To address this question, we selected mechanoreceptors of the rat vibrissal follicle-sinus complex in the mystacial pad and the trigeminal ganglia for an immunocytochemical and molecular biological study. RT-PCR of poly(A+) mRNA of rat trigeminal ganglia indicated that alpha-, beta-, and gamma-ENaC and stomatin mRNA are expressed in rat trigeminal ganglia. Using immunocytochemistry, we found that alpha-, beta-, and gamma-ENaC subunits and stomatin are localized in the perikarya of the trigeminal neurons and in a minor fraction of their termination site in the vibrissal follicle-sinus complex, where longitudinal lanceolate endings are immunopositive. We conclude that alpha-, beta-, and gamma-ENaC subunits as well as the candidate interacting protein stomatin are coexpressed in a mammalian mechanoreceptor, a location consistent with a possible role in mechanotransduction.
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Affiliation(s)
- B Fricke
- Department of Neuroanatomy, Institute of Anatomy MA6/152, Ruhr University, Bochum, Germany.
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28
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Tavernarakis N, Wang SL, Dorovkov M, Ryazanov A, Driscoll M. Heritable and inducible genetic interference by double-stranded RNA encoded by transgenes. Nat Genet 2000; 24:180-3. [PMID: 10655066 DOI: 10.1038/72850] [Citation(s) in RCA: 335] [Impact Index Per Article: 14.0] [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] [Indexed: 11/08/2022]
Abstract
Double-stranded RNA interference (RNAi) is an effective method for disrupting expression of specific genes in Caenorhabditis elegans and other organisms. Applications of this reverse-genetics tool, however, are somewhat restricted in nematodes because introduced dsRNA is not stably inherited. Another difficulty is that RNAi disruption of late-acting genes has been generally less consistent than that of embryonically expressed genes, perhaps because the concentration of dsRNA becomes lower as cellular division proceeds or as developmental time advances. In particular, some neuronally expressed genes appear refractory to dsRNA-mediated interference. We sought to extend the applicability of RNAi by in vivo expression of heritable inverted-repeat (IR) genes. We assayed the efficacy of in vivo-driven RNAi in three situations for which heritable, inducible RNAi would be advantageous: (i) production of large numbers of animals deficient for gene activities required for viability or reproduction; (ii) generation of large populations of phenocopy mutants for biochemical analysis; and (iii) effective gene inactivation in the nervous system. We report that heritable IR genes confer potent and specific gene inactivation for each of these applications. We suggest that a similar strategy might be used to test for dsRNA interference effects in higher organisms in which it is feasible to construct transgenic animals, but impossible to directly or transiently introduce high concentrations of dsRNA.
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Affiliation(s)
- N Tavernarakis
- Department of Molecular Biology and Biochemistry, Rutgers, The State University of New Jersey, Piscataway, New Jersey, USA
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29
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Driscoll M, Maloki L, Parker TE. Introduction to the special issue on frequency control and precision timing. IEEE Trans Ultrason Ferroelectr Freq Control 2000; 47:315-316. [PMID: 18238545 DOI: 10.1109/58.827415] [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] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Affiliation(s)
- M Driscoll
- Northrop Grumman, Electronic Sensors and Systems Sector, Blatimore, MD
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30
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Driscoll M, Maleki L, Parker TE. Introduction to the special issue on frequency control and precision timing-part II. IEEE Trans Ultrason Ferroelectr Freq Control 2000; 47:1091-1092. [PMID: 18238644 DOI: 10.1109/tuffc.2000.869033] [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] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Affiliation(s)
- M Driscoll
- Northrop Grumman Electronic Sensors and Systems
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31
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Tavernarakis N, Driscoll M. Caenorhabditis elegans degenerins and vertebrate ENaC ion channels contain an extracellular domain related to venom neurotoxins. J Neurogenet 2000; 13:257-64. [PMID: 10858823 DOI: 10.3109/01677060009084497] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [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] [Indexed: 11/13/2022]
Abstract
The DEG/ENaC (DEGenerin/Epithelial Na+ Channel) superfamily includes closely related ion channel subunits from divergent species ranging from the simple nematode Caenorhabditis elegans to humans. Members of this protein group play roles in several important processes including transduction of mechanical stimuli, sodium re-absorption and blood pressure regulation. Structure/function relationships in members of this superfamily are just beginning to be elaborated. Using a bio-informatics approach, we identified a novel structural element in the extracellular region of DEG/ENaC proteins that exhibits significant similarity to venom neurotoxins. Since venom neurotoxins bind to sodium channels at high affinity, we suggest that the related domain embedded in DEG/ENaC channels may interact with other regions of the channel or channel complex to modulate channel function.
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Affiliation(s)
- N Tavernarakis
- Department of Molecular Biology and Biochemistry, Nelson Biological Laboratories, Rutgers University, Piscataway, NJ 08855, USA.
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Henderson H, German VF, Panter AT, Huba GJ, Rohweder C, Zalumas J, Wolfe L, Uldall KK, Lalonde B, Henderson R, Driscoll M, Martin S, Duggan S, Rahimian A, Melchior LA. Systems change resulting from HIV/AIDS education and training. A cross-cutting evaluation of nine innovative projects. Eval Health Prof 1999; 22:405-26. [PMID: 10623398 DOI: 10.1177/01632789922034383] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
An evaluation of nine diverse HIV/AIDS training programs assessed the degree to which the programs produced changes in the ways that health care systems deliver HIV/AIDS care. Participants were interviewed an average of 8 months following completion of training and asked for specific examples of a resulting change in their health care system. More than half of the trainees gave at least one example of a systems change. The examples included the way patient referrals are made, the manner in which agency collaborations are organized, and the way care is delivered.
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Affiliation(s)
- H Henderson
- University of Mississippi Medical Center, USA
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33
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Winnier AR, Meir JY, Ross JM, Tavernarakis N, Driscoll M, Ishihara T, Katsura I, Miller DM. UNC-4/UNC-37-dependent repression of motor neuron-specific genes controls synaptic choice in Caenorhabditis elegans. Genes Dev 1999; 13:2774-86. [PMID: 10557206 PMCID: PMC317130 DOI: 10.1101/gad.13.21.2774] [Citation(s) in RCA: 98] [Impact Index Per Article: 3.9] [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: 01/08/2023]
Abstract
The UNC-4 homeoprotein and the Groucho-like corepressor UNC-37 specify synaptic choice in the Caenorhabditis elegans motor neuron circuit. In unc-4 mutants, VA motor neurons are miswired with inputs from interneurons normally reserved for their lineal sisters, the VB motor neurons. Here we show that UNC-4 and UNC-37 function together in VA motor neurons to repress VB-specific genes and that this activity depends on physical contact between UNC-37 and a conserved Engrailed-like repressor domain (eh1) in UNC-4. Missense mutations in the UNC-4 eh1 domain disrupt interactions between UNC-4 and UNC-37 and result in the loss of UNC-4-dependent repressor activity in vivo. A compensatory amino acid substitution in UNC-37 suppresses specific unc-4 alleles by restoring physical interactions with UNC-4 as well as UNC-4-dependent repression of VB-specific genes. We propose that repression of VB-specific genes by UNC-4 and UNC-37 is necessary for the creation of wild-type inputs to VA motor neurons. The existence of mammalian homologs of UNC-4 and UNC-37 indicates that a similar mechanism could regulate synaptic choice in the vertebrate spinal cord.
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Affiliation(s)
- A R Winnier
- Department of Cell Biology, Vanderbilt University Medical Center, Nashville, Tennessee 37232, USA
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Tavernarakis N, Driscoll M, Kyrpides NC. The SPFH domain: implicated in regulating targeted protein turnover in stomatins and other membrane-associated proteins. Trends Biochem Sci 1999; 24:425-7. [PMID: 10542406 DOI: 10.1016/s0968-0004(99)01467-x] [Citation(s) in RCA: 201] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- N Tavernarakis
- Department of Molecular Biology and Biochemistry Rutgers, The State University of New Jersey, New Jersey, USA.
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Abstract
To the surprise of many, studies of molecular mechanisms of touch transduction and analyses of epithelial Na+ transport have converged to define a new class of ion channel subunits. Based on the names of the first two identified subfamilies, the Caenorhabditis elegans degenerins and the vertebrate epithelial amiloride-sensitive Na+ channel, this ion channel class is called the DEG/ENaC superfamily. Members of the DEG/ENaC superfamily have been found in nematodes, flies, snails, and vertebrates. Family members share common topology, such that they span the membrane twice and have intracellular N- and C-termini; a large extracellular loop includes a conserved cysteine-rich region. DEG/ENaC channels have been implicated a broad spectrum of cellular functions, including mechanosensation, proprioception, pain sensation, gametogenesis, and epithelial Na+ transport. These channels exhibit diverse gating properties, ranging from near constitutive opening to rapid inactivation. We discuss working understanding of DEG/ENaC functions, channel properties, structure/activity correlations and possible evolutionary relationship to other channel classes.
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Affiliation(s)
- I Mano
- Department of Molecular Biology and Biochemistry, Rutgers, State University of New Jersey, Piscataway 08854, USA
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36
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Rodman J, Weill K, Driscoll M, Fenton T, Alpert H, Salem-Schatz S, Palfrey JS. A nationwide survey of financing health-related services for special education students. J Sch Health 1999; 69:133-139. [PMID: 10354981 DOI: 10.1111/j.1746-1561.1999.tb04169.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The Individuals with Disability Education Act (IDEA) requires state educational systems to provide school-based, health related services (RS). This survey determined the financing arrangements used by states for health-related services for school-aged children with disabilities. A survey was sent to directors of special education, Medicaid, and public health departments in each of the 50 states. Financial patterns for RS were sought at the state level for children ages 3-21 with disabilities for the 1993-1994 school year, the most recent year for which complete financial data were available. Univariate analyses probed the relationship between systems' variables and the extent of Medicaid usage by local education agencies. Respondents reported that schools tapped traditional health resources to supplement educational dollars in paying for related services in schools. Medicaid was by far the most common source with 29 states reporting established mechanisms for recouping Medicaid dollars and 10 states reporting phase-in activities. Seventeen states reported that departments of public health played some role in administration, training, and demonstrations, but only six states provided specific dollars for related services through the department. Use of private insurance was reported sporadically with only one state indicating a specific state-level program. Correlates of increased Medicaid usage were presence of interagency agreements (IAAs) (OR 11.1, p = 0.002), having specific personnel for school-based medical assistance (OR 17.7, p = 0.001), and utilizing school nursing services as a Medicaid optional service (OR 4.2, p = 0.048).
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Affiliation(s)
- J Rodman
- SMH Physician Service, Inc., Tamiami Trail, Nokomis, FL 34275, USA
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37
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Rahimian A, Driscoll M, Taylor D. The maternal and child health sites' practices regarding HIV education, counseling, and testing of women of reproductive age in Chicago: barriers to universal implementation. Matern Child Health J 1998; 2:35-44. [PMID: 10728257 DOI: 10.1023/a:1021893525536] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [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: 11/12/2022]
Abstract
OBJECTIVES Women of reproductive age are increasingly at risk for human immunodeficiency virus (HIV) infection. Recent advances in reducing perinatal transmission have resulted in official guidelines on universal HIV education, counseling, and voluntary testing of women of reproductive age, especially pregnant women. This study assesses to what extent the maternal child health (MCH) sites are implementing these guidelines with their female patient population (including pregnant women) and examines the barriers that prevent them from implementing these guidelines. METHOD The study uses survey data from 92 hospitals and community health centers offering MCH services in Chicago regarding their providers' practices on HIV education, counseling, and testing, implementation of zidovudine (ZDV) therapy to reduce perinatal transmission, and the barriers to implementing these services. In addition, 20 taped in-depth interviews were conducted with experts to examine the barriers to universal implementation. RESULTS Almost half (45% of perinatal care and 50% of family planning providers) of the institutions are not consistently offering HIV testing. One-third of those institutions that offer testing are not offering pretest counseling. Thirty-nine percent of the perinatal care providers in these institutions are not providing posttest counseling to HIV-negative women. Over one-third (35%) of these institutions reported that they are not set up to implement ZDV therapy during labor and delivery. Almost half (49%) had no protocols for ZDV therapy in place. Barriers to implementation included lack of provider training, limited staff time, physician resistance, unavailability or avoidance to seek perinatal care by high-risk women, cost, absence of a statewide and hospital-specific plan, lack of reproductive choice focus in posttest counseling, lack of provider knowledge about the administration of ZDV or its availability during labor, and lack of consumer education on perinatal risk reduction. CONCLUSIONS MCH sites and their providers need assistance to overcome many barriers they face to implement universal HIV education, counseling, and testing of women of reproductive age.
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Affiliation(s)
- A Rahimian
- University of Illinois at Chicago, School of Public Health, Division of Epidemiology/Biostatistics (M/C 922) 60612, USA.
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38
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Driscoll M, Buckenmyer C, Spirk M, Molchany C. Inserting and maintaining peripherally inserted central catheters. Medsurg Nurs 1997; 6:350-3, 356-8. [PMID: 9429407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Peripherally inserted central catheters are a type of vascular access device that has many advantages for patients with longer-term and special infusion needs. Increasingly common in home and hospital settings, nurses should know how to insert, maintain, and educate patients and families about these devices. One hospital's experiences implementing a model program is described.
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Affiliation(s)
- M Driscoll
- Lehigh Valley Hospital, Allentown, PA, USA
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39
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Harbinder S, Tavernarakis N, Herndon LA, Kinnell M, Xu SQ, Fire A, Driscoll M. Genetically targeted cell disruption in Caenorhabditis elegans. Proc Natl Acad Sci U S A 1997; 94:13128-33. [PMID: 9371811 PMCID: PMC24274 DOI: 10.1073/pnas.94.24.13128] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.1] [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: 02/13/1997] [Accepted: 09/11/1997] [Indexed: 02/05/2023] Open
Abstract
The elimination of identified cells is a powerful tool for investigating development and system function. Here we report on genetically mediated cell disruption effected by the toxic Caenorhabditis elegans mec-4(d) allele. We found that ectopic expression of mec-4(d) in the nematode causes dysfunction of a wide range of nerve, muscle, and hypodermal cells. mec-4(d)-mediated toxicity is dependent on the activity of a second gene, mec-6, rendering cell disruption conditionally dependent on genetic background. We describe a set of mec-4(d) vectors that facilitate construction of cell-specific disruption reagents and note that genetic cell disruption can be used for functional analyses of specific neurons or neuronal classes, for confirmation of neuronal circuitry, for generation of nematode populations lacking defined classes of functional cells, and for genetic screens. We suggest that mec-4(d) and/or related genes may be effective general tools for cell inactivation that could be used toward similar purposes in higher organisms.
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Affiliation(s)
- S Harbinder
- Department of Molecular Biology and Biochemistry, Rutgers, The State University of New Jersey, Center for Advanced Biotechnology and Medicine, Piscataway 08855, USA
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40
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Driscoll M, Tavernarakis N. Molecules that mediate touch transduction in the nematode Caenorhabditis elegans. Gravit Space Biol Bull 1997; 10:33-42. [PMID: 11540117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Abstract
Despite the widespread importance of mechanotransduction in biology, remarkably little is known about the nature of the molecules that mediate mechanical signaling. Mechanosensation in the nematode Caenorhabditis elegans is mediated by six mechanosensory neurons called touch receptor cells. Genetic analysis has resulted in the identification of over 400 mutations that disrupt the function of the touch receptors. Molecular characterization of the genes revealed has identified subunits of a candidate mechanosensory ion channel, tubulins expressed specifically in the touch receptors, and extracellular matrix proteins needed for mechanotransduction. mec-4 and mec-10 encode members of a C. elegans gene family related to the vertebrate epithelial Na+ channel that are hypothesized to encode subunits of a mechanosensory channel. mec-6 may encode another channel subunit. Inside the cell, alpha-tubulin MEC-12, beta-tubulin MEC-7 and a candidate linker protein MEC-2 may interact with the mechanotransducing channel to deliver gating tension. In the extracelluar matrix, collagen MEC-5 and MEC-9 and MEC-1 may interact with extracellular channel domains. A molecular model for mechanotransduction is discussed.
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Affiliation(s)
- M Driscoll
- Department of Molecular Biology and Biochemistry, Rutgers University, Piscataway, NJ 08855, USA
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41
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Hall DH, Gu G, García-Añoveros J, Gong L, Chalfie M, Driscoll M. Neuropathology of degenerative cell death in Caenorhabditis elegans. J Neurosci 1997; 17:1033-45. [PMID: 8994058 PMCID: PMC6573168] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/1996] [Revised: 11/12/1996] [Accepted: 11/26/1996] [Indexed: 02/03/2023] Open
Abstract
In Caenorhabditis elegans necrosis-like neuronal death is induced by gain-of-function (gf) mutations in two genes, mec-4 and deg-1, that encode proteins similar to subunits of the vertebrate amiloride-sensitive epithelial Na+ channel. We have determined the progress of cellular pathology in dying neurons via light and electron microscopy. The first detectable abnormality is an infolding of the plasma membrane and the production of small electron-dense whorls. Later, cytoplasmic vacuoles and larger membranous whorls form, and the cell swells. More slowly, chromatin aggregates and the nucleus invaginates. Mitochondria and Golgi are not dramatically affected until the final stages of cell death when organelles, and sometimes the cells themselves, lyse. Certain cells, including some muscle cells in deg-1 animals, express the abnormal gene products and display a few membrane abnormalities but do not die. These cells either express the mutant genes at lower levels, lack other proteins needed to form inappropriately functioning channels, or are better able to compensate for the toxic effects of the channels. Overall, the ultrastructural changes in these deaths suggest that enhanced membrane cycling precedes vacuolation and cell swelling. The pathology of mec-4(gf) and deg-1(gf) cells shares features with that of genetic disorders with alterations in channel subunits, such as hypokalemic periodic paralysis in humans and the weaver mouse, and with degenerative conditions, e.g., acute excitotoxic death. The initial pathology in all of these conditions may reflect attempts by affected cells to compensate for abnormal membrane proteins or functions.
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Affiliation(s)
- D H Hall
- Department of Neurosciences, Albert Einstein College of Medicine, Bronx, New York 10461, USA
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42
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Abstract
Genetic and molecular studies of touch avoidance in the nematode Caenorhabditis elegans have resulted in a molecular model for a mechanotransducing complex. mec-4 and mec-10 encode proteins hypothesized to be subunits of a mechanically gated ion channel that are related to subunits of the vertebrate amiloride-sensitive epithelial Na+ channel. Products of mec-5, a novel collagen, and mec-9, a protein that includes multiple Kunitz-type protease inhibitor repeats and EGF repeats, may interact with the channel in the extracellular matrix. Inside the cell, specialized 15-protofilament microtubules composed of mec-12 alpha-tubulin and mec-7 beta-tubulin may be linked to the mechanosensitive channel by stomatin-homologous MEC-2. MEC-4 and MEC-10 are members of a large family of C. elegans proteins, the degenerins. Two other degenerins, UNC-8 and DEL-1, are candidate components of a stretch-sensitive channel in motor neurons. Implications for advancing understanding of mechanotransduction in other systems are discussed.
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Affiliation(s)
- N Tavernarakis
- Department of Molecular Biology and Biochemistry, Rutgers University, New Brunswick, New Jersey 08855, USA
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43
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Tavernarakis N, Shreffler W, Wang S, Driscoll M. unc-8, a DEG/ENaC family member, encodes a subunit of a candidate mechanically gated channel that modulates C. elegans locomotion. Neuron 1997; 18:107-19. [PMID: 9010209 DOI: 10.1016/s0896-6273(01)80050-7] [Citation(s) in RCA: 152] [Impact Index Per Article: 5.6] [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] [Indexed: 02/03/2023]
Abstract
Mechanically gated ion channels are important modulators of coordinated movement, yet little is known of their molecular properties. We report that C. elegans unc-8, originally identified by gain-of-function mutations that induce neuronal swelling and severe uncoordination, encodes a DEG/ENaC family member homologous to subunits of a candidate mechanically gated ion channel. unc-8 is expressed in several sensory neurons, interneurons, and motor neurons. unc-8 null mutants exhibit previously unrecognized but striking defects in the amplitude and wavelength of sinusoidal tracks inscribed as they move through an E. coli lawn. We hypothesize that UNC-8 channels could modulate coordinated movement in response to body stretch. del-1, a second DEG/ENaC family member coexpressed with unc-8 in a subset of motor neurons, might also participate in a channel that contributes to nematode proprioception.
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Affiliation(s)
- N Tavernarakis
- Department of Molecular Biology and Biochemistry, Rutgers, The State University of New Jersey, Piscataway 08855, USA
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44
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Abstract
As is the case for most metazoans, C. elegans cells have the potential to undergo developmental cell death (programmed cell death) or a necrotic-like death in response to cell injury. Analysis of mutations that disrupt the reproducible pattern of cell death that occurs during C. elegans development has defined a genetic pathway for programmed cell death. This program involves the activities of certain genes, such as ces-1 and the ces-2 bZIP transcription factor, which regulate the life/death decision in specific subsets of cells. ced-9, a Bcl-2 family member, acts globally to negatively regulate the activities of ced-4S (which promotes cell death) and ced-4L, which promotes cell life. ced-3 encodes a member of the ICE cysteine protease family that is essential for execution of all programmed cell deaths. Once cells die, corpses are phagocytized and consumed in what appear to be at least two parallel pathways that require the activities of ced-1, ced-6, ced-7 and ced-2, ced-5, ced-10. Degradation of corpse DNA requires the product of the nuc-1 gene. Degenerative cell death, characterized by cell swelling, can be induced by different cell injuries including that conferred by mutant degenerin ion channels (encoded by deg-1, mec-4, mec-10 and unc-8) and by expression of human beta-amyloid peptide. Remarkable parallels between nematode and mammalian death programs have advanced understanding of human cell death mechanisms.
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Affiliation(s)
- M Driscoll
- Department of Molecular Biology and Biochemistry, Rutgers, State University of New Jersey, Piscataway 08855, USA.
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45
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Dykeman MC, Sternberg C, Jasek J, McGee DS, Driscoll M, Cohen V, Lubin B, Williamson M, Cohen M, Sherer R. A model for the delivery of care for HIV-positive clients. AIDS Patient Care STDS 1996; 10:240-5. [PMID: 11361595 DOI: 10.1089/apc.1996.10.240] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022] Open
Affiliation(s)
- M C Dykeman
- Cook County HIV Primary Care Center, Cook County Hospital, Chicago, IL., USA
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46
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Lai CC, Hong K, Kinnell M, Chalfie M, Driscoll M. Sequence and transmembrane topology of MEC-4, an ion channel subunit required for mechanotransduction in Caenorhabditis elegans. J Cell Biol 1996; 133:1071-81. [PMID: 8655580 PMCID: PMC2120861 DOI: 10.1083/jcb.133.5.1071] [Citation(s) in RCA: 93] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
The process by which mechanical stimuli are converted into cellular responses is poorly understood, in part because key molecules in this mode of signal transduction, the mechanically gated ion channels, have eluded cloning efforts. The Caenorhabditis elegans mec-4 gene encodes a subunit of a candidate mechanosensitive ion channel that plays a critical role in touch reception. Comparative sequence analysis of C. elegans and Caenorhabditis briggsae mec-4 genes was used to initiate molecular studies that establish MEC-4 as a 768-amino acid protein that includes two hydrophobic domains theoretically capable of spanning a lipid bilayer. Immunoprecipitation of in vitro translated mec-4 protein with domain-specific anti-MEC-4 antibodies and in vivo characterization of a series of mec-4lacZ fusion proteins both support the hypothesis that MEC-4 crosses the membrane twice. The MEC-4 amino- and carboxy-terminal domains are situated in the cytoplasm and a large domain, which includes three Cys-rich regions, is extracellular. Definition of transmembrane topology defines regions that might interact with the extracellular matrix or cytoskeleton to mediate mechanical signaling.
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Affiliation(s)
- C C Lai
- Department of Molecular Biology and Biochemistry, Rutgers University, Piscataway, New Jersey, 08855, USA
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47
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Abstract
NEURONAL signalling across synapses involves activation of many neurotransmitter receptors on postsynaptic cells. glr-1 encodes a potential glutamate receptor in the nematode Caenorhabditis elegans which is most similar to vertebrae AMPA-type ionotropic glutamate receptors. glr-1 is expressed in motor neurons and interneurons, including interneurons implicated in the control of locomotion. Here we investigate the contribution of glr-1 to the normal signalling of these neurons, by generating a deletion mutation in glr-1. We find that mutant worms are deficient in their ability to withdraw backwards when mechanically stimulated, but they withdraw normally in response to chemical repellents. The ASH sensory neurons mediate withdrawal responses both to mechanical stimuli and to repellents, and ASH makes chemical synapses with glr-1-expressing interneurons. Our results suggest that postsynaptic interneurons use different neurotransmitter receptors to process two sensory stimuli detected by one sensory neuron.
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Affiliation(s)
- A V Maricq
- Howard Hughes Medical Institute, Department of Anatomy, University of California, San Francisco 94143-0452, USA
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48
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Affiliation(s)
- M Driscoll
- Department of Molecular Biology and Biochemistry, Rutgers University, Piscataway, New Jersey 08855, USA
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49
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Driscoll M. Shifting the focus to primary and preventive care. New Jersey launches healthcare reform. NAHAM Manage J 1994; 20:18-9. [PMID: 10132417] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
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50
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Hong K, Driscoll M. A transmembrane domain of the putative channel subunit MEC-4 influences mechanotransduction and neurodegeneration in C. elegans. Nature 1994; 367:470-3. [PMID: 8107806 DOI: 10.1038/367470a0] [Citation(s) in RCA: 182] [Impact Index Per Article: 6.1] [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: 01/28/2023]
Abstract
Aberrant ion channel activity plays a causative role in several human disorders. Inappropriately regulated channel activity also appears to be the basis for neurodegeneration induced by dominant mutations of Caenorhabditis elegans mec-4 (mec-4(d)), a member of the degenerin gene family postulated to encode a subunit of a mechanosensory channel. The degenerin gene family has been defined by two C. elegans genes, mec-4 and deg-1, which can mutate to gain-of-function alleles that induce degeneration of specific groups of neurons. A related mammalian gene, rat alpha-rENaC, induces an amiloride-sensitive Na+ current when introduced to Xenopus oocytes, strongly suggesting that degenerin genes encode ion channel proteins. Deduced amino-acid sequences of the degenerins include two predicted membrane-spanning domains. Here we show that conserved amino acids within the second membrane-spanning domain (MSDII) are critical for MEC-4 activity and that specific substitutions within MSDII, whether encoded in cis or in trans to a mec-4(d) mutation, block or delay the onset of degeneration. Remarkably, MSDII from two other family members, C. elegans deg-1 and rat alpha-rENaC, can functionally substitute for MEC-4 MSDII in chimaeric proteins. Our results support a structural model for a mechanosensory channels in which multiple MEC-4 subunits are oriented such that MSDII lines the channel pore, and a neurodegeneration model in which aberrant ion flow through this channel is a key event.
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Affiliation(s)
- K Hong
- Department of Molecular Biology and Biochemistry, Rutgers University, Piscataway, New Jersey 08855
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