1
|
Vassilaki M, Pittock RR, Aakre JA, Castillo AM, Ramanan VK, Kremers WK, Jack CR, Vemuri P, Lowe VJ, Knopman DS, Petersen RC, Graff-Radford J. Author Response: Eligibility for Anti-Amyloid Treatment in a Population-Based Study of Cognitive Aging. Neurology 2024; 102:e209377. [PMID: 38648608 DOI: 10.1212/wnl.0000000000209377] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/25/2024] Open
|
2
|
Pittock RR, Aakre JA, Castillo AM, Ramanan VK, Kremers WK, Jack CR, Vemuri P, Lowe VJ, Knopman DS, Petersen RC, Graff-Radford J, Vassilaki M. Eligibility for Anti-Amyloid Treatment in a Population-Based Study of Cognitive Aging. Neurology 2023; 101:e1837-e1849. [PMID: 37586881 PMCID: PMC10663008 DOI: 10.1212/wnl.0000000000207770] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [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] [Received: 03/07/2023] [Accepted: 08/04/2023] [Indexed: 08/18/2023] Open
Abstract
BACKGROUND AND OBJECTIVES Treatment options for Alzheimer disease (AD) are limited and have focused mainly on symptomatic therapy and improving quality of life. Recently, lecanemab, an anti-β-amyloid monoclonal antibody (mAb), received accelerated approval by the US Food and Drug Administration for treatment in the early stages of biomarker-confirmed symptomatic AD. An additional anti-β-amyloid mAb, aducanumab, was approved in 2021, and more will potentially become available in the near future. Research on the applicability and generalizability of the anti-β-amyloid mAb eligibility criteria on adults with biomarkers available in the general population has been lacking. The study's primary aim was to apply the clinical trial eligibility criteria for lecanemab treatment to participants with early AD of the population-based Mayo Clinic Study of Aging (MCSA) and assess the generalizability of anti-amyloid treatment. The secondary aim of this study was to apply the clinical trial eligibility criteria for aducanumab treatment in MCSA participants. METHODS This cross-sectional study aimed to apply the clinical trial eligibility criteria for lecanemab and aducanumab treatment to participants with early AD of the population-based MCSA and assess the generalizability of anti-amyloid treatment. RESULTS Two hundred thirty-seven MCSA participants (mean age [SD] 80.9 [6.3] years, 54.9% male, and 97.5% White) with mild cognitive impairment (MCI) or mild dementia and increased brain amyloid burden by PiB PET comprised the study sample. Lecanemab trial's inclusion criteria reduced the study sample to 112 (47.3% of 237) participants. The trial's exclusion criteria further narrowed the number of potentially eligible participants to 19 (overall 8% of 237). Modifying the eligibility criteria to include all participants with MCI (instead of applying additional cognitive criteria) resulted in 17.4% of participants with MCI being eligible for lecanemab treatment. One hundred four participants (43.9% of 237) fulfilled the aducanumab clinical trial's inclusion criteria. The aducanumab trial's exclusion criteria further reduced the number of available participants, narrowing those eligible to 12 (5.1% of 237). Common exclusions were related to other chronic conditions and neuroimaging findings. DISCUSSION Findings estimate the limited eligibility in typical older adults with cognitive impairment for anti-β-amyloid mAbs.
Collapse
Affiliation(s)
- Rioghna R Pittock
- From the Department of Neurology (R.R.P., V.K.R., D.S.K., R.C.P., J.G.-R.), Mayo Clinic, Rochester, MN; The College (R.R.P.), University of Chicago, IL; Departments of Quantitative Health Sciences (J.A.A., A.M.C., W.K.K., R.C.P., M.V.) and Radiology (C.R.J., P.V., V.J.L.), Mayo Clinic, Rochester, MN
| | - Jeremiah A Aakre
- From the Department of Neurology (R.R.P., V.K.R., D.S.K., R.C.P., J.G.-R.), Mayo Clinic, Rochester, MN; The College (R.R.P.), University of Chicago, IL; Departments of Quantitative Health Sciences (J.A.A., A.M.C., W.K.K., R.C.P., M.V.) and Radiology (C.R.J., P.V., V.J.L.), Mayo Clinic, Rochester, MN
| | - Anna M Castillo
- From the Department of Neurology (R.R.P., V.K.R., D.S.K., R.C.P., J.G.-R.), Mayo Clinic, Rochester, MN; The College (R.R.P.), University of Chicago, IL; Departments of Quantitative Health Sciences (J.A.A., A.M.C., W.K.K., R.C.P., M.V.) and Radiology (C.R.J., P.V., V.J.L.), Mayo Clinic, Rochester, MN
| | - Vijay K Ramanan
- From the Department of Neurology (R.R.P., V.K.R., D.S.K., R.C.P., J.G.-R.), Mayo Clinic, Rochester, MN; The College (R.R.P.), University of Chicago, IL; Departments of Quantitative Health Sciences (J.A.A., A.M.C., W.K.K., R.C.P., M.V.) and Radiology (C.R.J., P.V., V.J.L.), Mayo Clinic, Rochester, MN
| | - Walter K Kremers
- From the Department of Neurology (R.R.P., V.K.R., D.S.K., R.C.P., J.G.-R.), Mayo Clinic, Rochester, MN; The College (R.R.P.), University of Chicago, IL; Departments of Quantitative Health Sciences (J.A.A., A.M.C., W.K.K., R.C.P., M.V.) and Radiology (C.R.J., P.V., V.J.L.), Mayo Clinic, Rochester, MN
| | - Clifford R Jack
- From the Department of Neurology (R.R.P., V.K.R., D.S.K., R.C.P., J.G.-R.), Mayo Clinic, Rochester, MN; The College (R.R.P.), University of Chicago, IL; Departments of Quantitative Health Sciences (J.A.A., A.M.C., W.K.K., R.C.P., M.V.) and Radiology (C.R.J., P.V., V.J.L.), Mayo Clinic, Rochester, MN
| | - Prashanthi Vemuri
- From the Department of Neurology (R.R.P., V.K.R., D.S.K., R.C.P., J.G.-R.), Mayo Clinic, Rochester, MN; The College (R.R.P.), University of Chicago, IL; Departments of Quantitative Health Sciences (J.A.A., A.M.C., W.K.K., R.C.P., M.V.) and Radiology (C.R.J., P.V., V.J.L.), Mayo Clinic, Rochester, MN
| | - Val J Lowe
- From the Department of Neurology (R.R.P., V.K.R., D.S.K., R.C.P., J.G.-R.), Mayo Clinic, Rochester, MN; The College (R.R.P.), University of Chicago, IL; Departments of Quantitative Health Sciences (J.A.A., A.M.C., W.K.K., R.C.P., M.V.) and Radiology (C.R.J., P.V., V.J.L.), Mayo Clinic, Rochester, MN
| | - David S Knopman
- From the Department of Neurology (R.R.P., V.K.R., D.S.K., R.C.P., J.G.-R.), Mayo Clinic, Rochester, MN; The College (R.R.P.), University of Chicago, IL; Departments of Quantitative Health Sciences (J.A.A., A.M.C., W.K.K., R.C.P., M.V.) and Radiology (C.R.J., P.V., V.J.L.), Mayo Clinic, Rochester, MN
| | - Ronald C Petersen
- From the Department of Neurology (R.R.P., V.K.R., D.S.K., R.C.P., J.G.-R.), Mayo Clinic, Rochester, MN; The College (R.R.P.), University of Chicago, IL; Departments of Quantitative Health Sciences (J.A.A., A.M.C., W.K.K., R.C.P., M.V.) and Radiology (C.R.J., P.V., V.J.L.), Mayo Clinic, Rochester, MN
| | - Jonathan Graff-Radford
- From the Department of Neurology (R.R.P., V.K.R., D.S.K., R.C.P., J.G.-R.), Mayo Clinic, Rochester, MN; The College (R.R.P.), University of Chicago, IL; Departments of Quantitative Health Sciences (J.A.A., A.M.C., W.K.K., R.C.P., M.V.) and Radiology (C.R.J., P.V., V.J.L.), Mayo Clinic, Rochester, MN
| | - Maria Vassilaki
- From the Department of Neurology (R.R.P., V.K.R., D.S.K., R.C.P., J.G.-R.), Mayo Clinic, Rochester, MN; The College (R.R.P.), University of Chicago, IL; Departments of Quantitative Health Sciences (J.A.A., A.M.C., W.K.K., R.C.P., M.V.) and Radiology (C.R.J., P.V., V.J.L.), Mayo Clinic, Rochester, MN.
| |
Collapse
|
3
|
Mielke MM, Kapoor E, Geske JR, Fields JA, LeBrasseur NK, Morrow MM, Winham SJ, Faubion LL, Castillo AM, Hofrenning EI, Bailey KR, Rocca WA, Kantarci K. Long-term effects of premenopausal bilateral oophorectomy with or without hysterectomy on physical aging and chronic medical conditions. Menopause 2023; 30:1090-1097. [PMID: 37699239 PMCID: PMC10615715 DOI: 10.1097/gme.0000000000002254] [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] [Indexed: 09/14/2023]
Abstract
OBJECTIVE We examined the long-term effects of premenopausal bilateral oophorectomy (PBO) with or without concurrent or preceding hysterectomy on physical and cognitive function and on odds of chronic conditions. METHODS We enrolled 274 women with PBO with or without concurrent or preceding hysterectomy and 240 referents aged 55 years and older who were residents of Olmsted County, MN as of the PBO or index date. Chronic conditions were assessed via medical record abstraction. Cognitive diagnoses were based on neurocognitive testing. A physical function assessment included measures of strength and mobility. Multivariable regression models compared characteristics for women with PBO <46 years, PBO 46-49 years, and referent women with adjustments for age and other confounders. RESULTS The clinical visits (median age, 67 years) were a median of 22 years after the PBO or index date. Of 274 women with PBO, 161 (59%) were <46 years at PBO and 113 (41%) were 46-49 years. Compared with referents, women with a history of PBO <46 years had increased odds of arthritis (odds ratio [OR], 1.64; 95% confidence interval [CI], 1.06-2.55), asthma (OR, 1.74; 95% CI, 1.03-2.93), obstructive sleep apnea (OR, 2.00; 95% CI, 1.23-3.26), and bone fractures (OR, 2.86; 95% CI, 1.17-6.98), and walked a shorter mean distance on a 6-minute walk test ( b = -18.43; P = 0.034). Compared with referents, women with a history of PBO at age 46-49 years had increased odds of arthritis (OR, 1.92; 95% CI, 1.16-3.18) and obstructive sleep apnea (OR, 2.21; 95% CI, 1.33-3.66). There were no significant differences in cognitive status in women with PBO compared with referents. CONCLUSIONS Women with a history of PBO with or without concurrent or preceding hysterectomy, especially at age <46 years, have more chronic conditions in late mid-life compared with referents.
Collapse
Affiliation(s)
- Michelle M. Mielke
- Department of Epidemiology and Prevention, Wake Forest University School of Medicine, Winston-Salem, NC
| | - Ekta Kapoor
- Mayo Clinic Center for Women’s Health, Mayo Clinic, Rochester, MN
- Women’s Health Research Center, Mayo Clinic, Rochester, MN
- Division of General Internal Medicine, Mayo Clinic, Rochester, MN
- Division of Endocrinology, Diabetes, Metabolism, and Nutrition, Mayo Clinic, Rochester, MN
| | - Jennifer R. Geske
- Department of Quantitative Health Sciences, Mayo Clinic, Rochester, MN
| | - Julie A. Fields
- Department of Psychiatry and Psychology, Mayo Clinic, Rochester, MN
| | - Nathan K. LeBrasseur
- Robert and Arlene Kogod Center on Aging, Mayo Clinic, Rochester, MN
- Department of Physiology and Biomedical Engineering, Mayo Clinic, Rochester, Minnesota
- Department of Physical Medicine and Rehabilitation, Mayo Clinic, Rochester, MN
| | - Melissa M. Morrow
- University of Texas Medical Branch, Department of Nutrition, Metabolism & Rehabilitation Sciences, Galveston, TX
| | - Stacey J. Winham
- Department of Quantitative Health Sciences, Mayo Clinic, Rochester, MN
| | | | - Anna M. Castillo
- Department of Quantitative Health Sciences, Mayo Clinic, Rochester, MN
| | | | - Kent R. Bailey
- Department of Quantitative Health Sciences, Mayo Clinic, Rochester, MN
| | - Walter A. Rocca
- Women’s Health Research Center, Mayo Clinic, Rochester, MN
- Department of Quantitative Health Sciences, Mayo Clinic, Rochester, MN
- Department of Neurology, Mayo Clinic, Rochester, MN
| | | |
Collapse
|
4
|
Coon EA, Castillo AM, Lesnick TG, Raghavan S, Mielke MM, Reid RI, Windham BG, Petersen RC, Jack CR, Graff-Radford J, Vemuri P. Blood pressure changes impact corticospinal integrity and downstream gait and balance control. Neurobiol Aging 2022; 120:60-67. [PMID: 36122540 PMCID: PMC9613619 DOI: 10.1016/j.neurobiolaging.2022.08.011] [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: 01/31/2022] [Revised: 08/12/2022] [Accepted: 08/21/2022] [Indexed: 10/15/2022]
Abstract
Blood pressure (BP) plays an important role in white matter integrity. We sought to determine the role of intra-individual BP changes on white matter and evaluate the impact on gait speed and imbalance by sex. We identified 990 eligible participants in the population-based Mayo Clinic Study of Aging and analyzed fractional anisotropy (FA) in white matter regions. Using structural equation models (SEM), we assessed the effect of BP slope on corticospinal tract (CST) FA and downstream effects on gait speed and imbalance after age and sex effects. Of 990 participants, 438 (44%) were female with mean age of 76 years. In linear models predicting CST FA, a greater change in BP slope (0.0004; p = 0.026) and female sex (0.017; p < 0.001) were significant predictors of lower CST FA. SEMs showed that older age, female sex, and higher BP slope predicted lower CST FA, and lower CST FA predicted worse downstream motor control. Therefore, intra-individual BP slope and variability impact corticospinal tract microstructural properties of white matter with females having increased susceptibility to damage.
Collapse
Affiliation(s)
| | - Anna M Castillo
- Department of Quantitative Health Sciences, Mayo Clinic, Rochester, MN, USA
| | - Timothy G Lesnick
- Department of Quantitative Health Sciences, Mayo Clinic, Rochester, MN, USA
| | | | - Michelle M Mielke
- Department of Neurology, Mayo Clinic, Rochester, MN, USA; Department of Quantitative Health Sciences, Mayo Clinic, Rochester, MN, USA
| | - Robert I Reid
- Department of Information Technology, Mayo Clinic, Rochester, MN, USA
| | - B Gwen Windham
- Department of Medicine and Geriatrics, University of Mississippi Medical Center, Jackson, MS, USA
| | | | | | | | | |
Collapse
|
5
|
Vemuri P, Castillo AM, Thostenson KB, Ward CP, Raghavan S, Reid RI, Lesnick TG, Reddy AL, Gehrking TL, Gehrking JA, Sletten DM, Jack CR, Low PA, Singer W. Imaging biomarkers for early multiple system atrophy. Parkinsonism Relat Disord 2022; 103:60-68. [PMID: 36063706 PMCID: PMC10597684 DOI: 10.1016/j.parkreldis.2022.08.028] [Citation(s) in RCA: 2] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/26/2022] [Revised: 08/17/2022] [Accepted: 08/22/2022] [Indexed: 10/15/2022]
Abstract
OBJECTIVE To systematically evaluate structural MRI and diffusion MRI features for cross-sectional discrimination and tracking of longitudinal disease progression in early multiple system atrophy (MSA). METHODS In a prospective, longitudinal study of synucleinopathies with imaging on 14 controls and 29 MSA patients recruited at an early disease stage (15 predominant cerebellar ataxia subtype or MSA-C and 14 predominant parkinsonism subtype or MSA-P), we computed regional morphometric and diffusion MRI features. We identified morphometric features by ranking them based on their ability to distinguish MSA-C from controls and MSA-P from controls and evaluated diffusion changes in these regions. For the top performing regions, we evaluated their utility for tracking longitudinal disease progression using imaging from 12-month follow-up and computed sample size estimates for a hypothetical clinical trial in MSA. We also computed these selected morphometric features in an independent validation dataset. RESULTS We found that morphometric changes in the cerebellar white matter, brainstem, and pons can separate early MSA-C patients from controls both cross-sectionally and longitudinally (p < 0.01). The putamen and striatum, though useful for separating early MSA-P patients from control subjects at baseline, were not useful for tracking MSA disease progression. Cerebellum white matter diffusion changes aided in capturing early disease related degeneration in MSA. INTERPRETATION Regardless of clinically predominant features at the time of MSA assessment, brainstem and cerebellar pathways progressively deteriorate with disease progression. Quantitative measurements of these regions are promising biomarkers for MSA diagnosis in early disease stage and potential surrogate markers for future MSA clinical trials.
Collapse
Affiliation(s)
- Prashanthi Vemuri
- Mayo Clinic and Foundation, 200 First Street SW, Rochester, MN, 55905, USA.
| | - Anna M Castillo
- Mayo Clinic and Foundation, 200 First Street SW, Rochester, MN, 55905, USA
| | - Kaely B Thostenson
- Mayo Clinic and Foundation, 200 First Street SW, Rochester, MN, 55905, USA
| | - Chadwick P Ward
- Mayo Clinic and Foundation, 200 First Street SW, Rochester, MN, 55905, USA
| | | | - Robert I Reid
- Mayo Clinic and Foundation, 200 First Street SW, Rochester, MN, 55905, USA
| | - Timothy G Lesnick
- Mayo Clinic and Foundation, 200 First Street SW, Rochester, MN, 55905, USA
| | - Ashritha L Reddy
- Mayo Clinic and Foundation, 200 First Street SW, Rochester, MN, 55905, USA
| | - Tonette L Gehrking
- Mayo Clinic and Foundation, 200 First Street SW, Rochester, MN, 55905, USA
| | - Jade A Gehrking
- Mayo Clinic and Foundation, 200 First Street SW, Rochester, MN, 55905, USA
| | - David M Sletten
- Mayo Clinic and Foundation, 200 First Street SW, Rochester, MN, 55905, USA
| | - Clifford R Jack
- Mayo Clinic and Foundation, 200 First Street SW, Rochester, MN, 55905, USA
| | - Phillip A Low
- Mayo Clinic and Foundation, 200 First Street SW, Rochester, MN, 55905, USA
| | - Wolfgang Singer
- Mayo Clinic and Foundation, 200 First Street SW, Rochester, MN, 55905, USA.
| |
Collapse
|
6
|
Kara F, Lohse CM, Castillo AM, Tosakulwong N, Lesnick TG, Jack CR, Petersen RC, Olson JE, Couch FJ, Ruddy KJ, Kantarci K, Mielke MM. Association of raloxifene and tamoxifen therapy with cognitive performance, odds of mild cognitive impairment, and brain MRI markers of neurodegeneration. Cancer Med 2022; 12:2805-2817. [PMID: 36040183 PMCID: PMC9939086 DOI: 10.1002/cam4.5175] [Citation(s) in RCA: 3] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2022] [Revised: 08/09/2022] [Accepted: 08/17/2022] [Indexed: 11/11/2022] Open
Abstract
The aim of this cross-sectional study was to examine whether a history of selective estrogen receptor modifiers (SERMs), tamoxifen and raloxifene, use was associated with cognitive performance, odds of mild cognitive impairment (MCI), or magnetic resonance imaging (MRI) markers of neurodegeneration associated with Alzheimer's disease. We included women with prior history of breast cancer or no prior history of any cancer at enrollment in the Mayo Clinic Study of Aging (MCSA). This information was abstracted using the Rochester Epidemiology Project medical-linkage system. Logistic regression was used to examine associations of SERMs with odds of MCI. Linear regression models were used to examine associations of SERMs with cognitive z-scores (Memory, Executive Function, Language, Visuospatial Skills, Global Cognition), and MRI markers. Among 2840 women aged 50 and older in the MCSA, 151 had a history of breast cancer, and 42 (28%) of these had a history of tamoxifen treatment. A total of 2235 women had no prior history of any cancer, and 76 (3%) of these had a history of raloxifene use. No significant associations between tamoxifen use and cognition, or odds of MCI were observed among women with a history of breast cancer after adjusting for confounders. Similarly, raloxifene use was not significantly associated with cognition, or odds of MCI in women without a history of cancer after adjusting for confounders. We did not find significant associations between the use of either SERM and MRI markers. Use of tamoxifen or raloxifene was not significantly associated with cognition in postmenopausal women.
Collapse
Affiliation(s)
- Firat Kara
- Department of RadiologyMayo ClinicRochesterMinnesotaUSA
| | - Christine M. Lohse
- Department of Quantitative Health SciencesMayo ClinicRochesterMinnesotaUSA
| | - Anna M. Castillo
- Department of Quantitative Health SciencesMayo ClinicRochesterMinnesotaUSA
| | | | - Timothy G. Lesnick
- Department of Quantitative Health SciencesMayo ClinicRochesterMinnesotaUSA
| | | | | | - Janet E. Olson
- Health Sciences ResearchMayo ClinicRochesterMinnesotaUSA
| | - Fergus J. Couch
- Department of Laboratory Medicine and PathologyMayo ClinicRochesterMinnesotaUSA
| | | | | | - Michelle M. Mielke
- Department of Quantitative Health SciencesMayo ClinicRochesterMinnesotaUSA,Department of Epidemiology and PreventionWake Forest University School of MedicineWinston‐SalemNorth CarolinaUSA
| |
Collapse
|
7
|
Cogswell PM, Aakre JA, Castillo AM, Knopman DS, Kantarci K, Rabinstein AA, Petersen RC, Clifford RJ, Mielke MM, Vemuri P, Graff-Radford J. Population-based prevalence of infarctions on 3D fluid-attenuated inversion recovery (FLAIR) imaging. J Stroke Cerebrovasc Dis 2022; 31:106583. [PMID: 35689933 PMCID: PMC9329259 DOI: 10.1016/j.jstrokecerebrovasdis.2022.106583] [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: 02/23/2022] [Revised: 05/19/2022] [Accepted: 05/24/2022] [Indexed: 11/28/2022] Open
Abstract
OBJECTIVES To report population-based, age-specific prevalence of infarctions as identified via 3D fluid-attenuated inversion recovery (FLAIR) imaging. MATERIALS AND METHODS Participants without dementia in the Mayo Clinic Study of Aging (MCSA), a population-based study in Olmsted County, MN, age 50-89 who underwent 3D FLAIR imaging between 2017 and 2020 were included. Infarctions per participant were determined via visual interpretation. Inter- and intra-reader reliability were calculated. Infarction prevalence on 3D FLAIR was derived by standardization to the Olmsted County population and was compared to that previously reported on 2D FLAIR imaging. RESULTS Among 580 participants (mean age 71 years, 46% female) the prevalence (95% confidence interval) of any infarction was 5.0% (0.0%-9.9%) at age 50-59 years and 38.8% (28.6%-49.0%) at 80-89 years. In addition to increasing with age, the prevalence varied by sex and type of infarction. Prevalence estimates of cortical infarcts were 0.9% (0.0%-2.7%) at age 50-59 years and 20.2% (10.7%-29.7%) at 80-89 years and lacunar infarcts 4.1% (0.0%-8.8%) at age 50-59 years and 31.2% (21.5%-41.0%) at 80-89 years. Prevalence estimates of any infarction by sex were: men, 8.7% (0.0%-18.7%) at 50-59 years and 54.9% (41.0%-68.8%) at 80-89 years and women, 2.4% (0.0%-7.3%) at age 50-59 years and 27.3% (12.9%-41.7%) at 80-89 years. Intra- and inter- reader reliability were very good (kappa = 0.85 and 0.82, respectively). After adjusting for age, sex and education, individuals imaged with 3D FLAIR were 1.5 times (95% CI 1.2-1.8, p<0.001) more likely to be identified as positive for infarction compared to those imaged with 2D FLAIR. CONCLUSIONS Infarction prevalence increases with age and is greater in men than women. Infarction prevalence on 3D FLAIR imaging, which has become more widely implemented as an alternative to 2D FLAIR over the past several years, will be a useful reference in future work.
Collapse
|
8
|
Dubas E, Castillo AM, Żur I, Krzewska M, Vallés MP. Microtubule organization changes severely after mannitol and n-butanol treatments inducing microspore embryogenesis in bread wheat. BMC Plant Biol 2021; 21:586. [PMID: 34886809 PMCID: PMC8656030 DOI: 10.1186/s12870-021-03345-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Accepted: 11/08/2021] [Indexed: 06/13/2023]
Abstract
BACKGROUND A mannitol stress treatment and a subsequent application of n-butanol, known as a microtubule-disrupting agent, enhance microspore embryogenesis (ME) induction and plant regeneration in bread wheat. To characterize changes in cortical (CMT) and endoplasmic (EMT) microtubules organization and dynamics, associated with ME induction treatments, immunocytochemistry studies complemented by confocal laser scanning microscopy (CLSM) were accomplished. This technique has allowed us to perform advanced 3- and 4D studies of MT architecture. The degree of MT fragmentation was examined by the relative fluorescence intensity quantification. RESULTS In uni-nucleated mannitol-treated microspores, severe CMT and EMT fragmentation occurs, although a complex network of short EMT bundles protected the nucleus. Additional treatment with n-butanol resulted in further depolymerization of both CMT and EMT, simultaneously with the formation of MT aggregates in the perinuclear region. Some aggregates resembled a preprophase band. In addition, a portion of the microspores progressed to the first mitotic division during the treatments. Bi-nucleate pollen-like structures showed a high MT depolymerization after mannitol treatment and numerous EMT bundles around the vegetative and generative nuclei after n-butanol. Interestingly, bi-nucleate symmetric structures showed prominent stabilization of EMT. CONCLUSIONS Fragmentation and stabilization of microtubules induced by mannitol- and n-butanol lead to new configurations essential for the induction of microspore embryogenesis in bread wheat. These results provide robust insight into MT dynamics during EM induction and open avenues to address newly targeted treatments to induce ME in recalcitrant species.
Collapse
Affiliation(s)
- E Dubas
- The Franciszek Górski Institute of Plant Physiology, Polish Academy of Sciences, Niezapominajek 21, 30-239, Kraków, Poland.
| | - A M Castillo
- Estación Experimental de Aula Dei, Consejo Superior de Investigaciones Científicas (EEAD-CSIC), Avda Montañana 1005, 50059, Zaragoza, Spain
| | - I Żur
- The Franciszek Górski Institute of Plant Physiology, Polish Academy of Sciences, Niezapominajek 21, 30-239, Kraków, Poland
| | - M Krzewska
- The Franciszek Górski Institute of Plant Physiology, Polish Academy of Sciences, Niezapominajek 21, 30-239, Kraków, Poland
| | - M P Vallés
- Estación Experimental de Aula Dei, Consejo Superior de Investigaciones Científicas (EEAD-CSIC), Avda Montañana 1005, 50059, Zaragoza, Spain.
| |
Collapse
|
9
|
Ramanan VK, Castillo AM, Knopman DS, Graff-Radford J, Lowe VJ, Petersen RC, Jack CR, Mielke MM, Vemuri P. Association of Apolipoprotein E ɛ4, Educational Level, and Sex With Tau Deposition and Tau-Mediated Metabolic Dysfunction in Older Adults. JAMA Netw Open 2019; 2:e1913909. [PMID: 31642932 PMCID: PMC6820045 DOI: 10.1001/jamanetworkopen.2019.13909] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
IMPORTANCE While amyloidosis is an early event in the Alzheimer disease (AD) biomarker cascade, a complex interplay among the apolipoprotein E (APOE) ɛ4 allele, educational levels, and sex may be associated with an individual's resilience to dementia. OBJECTIVE To assess whether APOE ɛ4, educational levels, and sex are associated with regional tau deposition and tau-mediated metabolic dysfunction in older adults. DESIGN, SETTING, AND PARTICIPANTS Population-based cohort study of individuals aged 65 years and older enrolled between January 1, 2004, and May 1, 2018, in the Mayo Clinic Study of Aging, a prospective longitudinal study of cognitive aging in Olmsted County, Minnesota. MAIN OUTCOMES AND MEASURES The primary outcomes were cross-sectional tau burden and the fluorodeoxyglucose (FDG) to tau ratio (as a measure of tau-mediated metabolic dysfunction) assessed by positron emission tomography for 43 atlas-defined regions, with specific focus on the entorhinal, inferior temporal, and posterior cingulate cortices. EXPOSURES Using linear regression, APOE ɛ4 status and years of education were the primary exposure variables, with sex additionally investigated through interaction models. RESULTS The sample included 325 individuals (173 [53%] male; mean [SD] age, 76.1 [7.2] years; 291 [90%] cognitively unimpaired). Although APOE ɛ4 was nominally associated with higher tau deposition (β = 0.05 [95% CI, 0.02-0.09]; P = .001; Cohen d = 0.40) and lower FDG to tau ratio (β = -0.05 [95% CI, -0.08 to -0.01]; P = .008; Cohen d = 0.33) in the entorhinal cortex, these associations were completely attenuated after controlling for global amyloid burden. Education was not associated with regional tau burden or FDG to tau ratio. In the 3 regions of interest, global amyloid burden accounted for the largest proportion of variance in tau deposition among the candidate variables assessed. In the entorhinal cortex, significant interactions were identified between APOE ɛ4 and global amyloid burden on tau (β = 0.25; SE = 0.06; P < .001) and between sex and tau burden on FDG metabolism (β = 0.10; SE = 0.05; P = .049). CONCLUSIONS AND RELEVANCE These results suggest that (1) tau deposition is most significantly associated with amyloidosis; (2) in the presence of abundant amyloidosis, APOE ɛ4 may be associated with accelerated entorhinal cortex tau deposition; and (3) women may have lower resilience to tau, manifested by a higher degree of metabolic dysfunction in the entorhinal cortex in response to tau pathology.
Collapse
Affiliation(s)
- Vijay K Ramanan
- Department of Neurology, Mayo Clinic–Rochester, Rochester, Minnesota
| | - Anna M. Castillo
- Department of Health Sciences Research, Mayo Clinic–Rochester, Rochester, Minnesota
| | - David S. Knopman
- Department of Neurology, Mayo Clinic–Rochester, Rochester, Minnesota
| | | | - Val J. Lowe
- Department of Radiology, Mayo Clinic–Rochester, Rochester, Minnesota
| | - Ronald C. Petersen
- Department of Neurology, Mayo Clinic–Rochester, Rochester, Minnesota
- Department of Health Sciences Research, Mayo Clinic–Rochester, Rochester, Minnesota
| | - Clifford R. Jack
- Department of Radiology, Mayo Clinic–Rochester, Rochester, Minnesota
| | - Michelle M. Mielke
- Department of Neurology, Mayo Clinic–Rochester, Rochester, Minnesota
- Department of Health Sciences Research, Mayo Clinic–Rochester, Rochester, Minnesota
| | - Prashanthi Vemuri
- Department of Radiology, Mayo Clinic–Rochester, Rochester, Minnesota
| |
Collapse
|
10
|
Ramanan VK, Przybelski SA, Graff-Radford J, Castillo AM, Lowe VJ, Mielke MM, Roberts RO, Reid RI, Knopman DS, Jack CR, Petersen RC, Vemuri P. Statins and Brain Health: Alzheimer's Disease and Cerebrovascular Disease Biomarkers in Older Adults. J Alzheimers Dis 2019; 65:1345-1352. [PMID: 30149450 DOI: 10.3233/jad-180446] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [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: 12/31/2022]
Abstract
BACKGROUND Statins have been proposed to reduce the risk of Alzheimer's disease (AD). OBJECTIVE Assess whether long-term statin use was associated with neuroimaging biomarkers of aging and dementia. METHODS Methods: We analyzed neuroimaging biomarkers in 1,160 individuals aged 65+ from the Mayo Clinic Study of Aging, a population-based prospective longitudinal study of cognitive aging. RESULTS Statin-treated (5+ years of therapy) individuals had greater burden of mid-and late-life cardiovascular disease (p < 0.001) than statin-untreated (≤3 months) individuals. Lower fractional anisotropy in the genu of the corpus callosum, an early marker of cerebrovascular disease, was associated with long-term statin exposure (p < 0.035). No significant associations were identified between long-term statin exposure and cerebral amyloid or tau burden, AD pattern neurodegeneration, or white matter hyperintensity burden. CONCLUSIONS Long-term statin therapy was not associated with differences in AD biomarkers. Individuals with long-term statin exposure had worse white matter integrity in the genu of the corpus callosum, consistent with the coexistence of higher cerebrovascular risk factor burden in this group.
Collapse
Affiliation(s)
- Vijay K Ramanan
- Department of Neurology, Mayo Clinic-Rochester, Rochester, MN, USA
| | - Scott A Przybelski
- Department of Health Sciences Research, Mayo Clinic-Rochester, Rochester, MN, USA
| | | | - Anna M Castillo
- Department of Health Sciences Research, Mayo Clinic-Rochester, Rochester, MN, USA
| | - Val J Lowe
- Department of Radiology, Mayo Clinic-Rochester, Rochester, MN, USA
| | - Michelle M Mielke
- Department of Neurology, Mayo Clinic-Rochester, Rochester, MN, USA.,Department of Health Sciences Research, Mayo Clinic-Rochester, Rochester, MN, USA
| | - Rosebud O Roberts
- Department of Neurology, Mayo Clinic-Rochester, Rochester, MN, USA.,Department of Health Sciences Research, Mayo Clinic-Rochester, Rochester, MN, USA
| | - Robert I Reid
- Department of Information Technology, Mayo Clinic-Rochester, Rochester, MN, USA
| | - David S Knopman
- Department of Neurology, Mayo Clinic-Rochester, Rochester, MN, USA
| | - Clifford R Jack
- Department of Radiology, Mayo Clinic-Rochester, Rochester, MN, USA
| | - Ronald C Petersen
- Department of Neurology, Mayo Clinic-Rochester, Rochester, MN, USA.,Department of Health Sciences Research, Mayo Clinic-Rochester, Rochester, MN, USA
| | | |
Collapse
|
11
|
Blizniak AG, Zapata DFM, Bailén MR, Morante A, Castillo-Lorente E, Pola de Gallego MD, Ferrón FR, La Rosa J, Castillo AM, Aguilar LR. 0531. Cumulative effects of negative energy balance on myocardial deformity and diastolic function during the first week of ICU: a pilot study. Intensive Care Med Exp 2014. [PMCID: PMC4797396 DOI: 10.1186/2197-425x-2-s1-p31] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
|
12
|
Corral P, Gutiérrez MC, Castillo AM, Domínguez M, Lopalco P, Corcelli A, Ventosa A. Natronococcus roseus sp. nov., a haloalkaliphilic archaeon from a hypersaline lake. Int J Syst Evol Microbiol 2012; 63:104-108. [PMID: 22345136 DOI: 10.1099/ijs.0.036558-0] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A novel halophilic archaeon, strain CG-1(T), belonging to the genus Natronococcus was isolated from sediment of the soda lake Chagannor in Inner Mongolia, China. The colonies of this strain were pink pigmented, the intensity of the colour decreased when the cells grew at salt saturation levels. The cells were non-motile cocci and strictly aerobic. Hypotonic treatment did not cause cell lysis, even in distilled water. Strain CG-1(T) grew at 15-30.0 % (w/v) NaCl and at 30-50 °C and pH 8.0-11.0, with optimal growth occurring at 25-30 % (w/v) NaCl, 37-45 °C and pH 9-9.5. MgCl(2) was not required for growth. Strain CG-1(T) was most closely related to the type strains of Natronococcus amylolyticus Ah-36(T), Natronococcus jeotgali B1(T) and Natronococcus occultus SP4(T), with which it shared 98.4 %, 96.2 and 95.7 % 16S rRNA gene sequence similarity, respectively. The polar lipids consisted of C(20)C(20) and C(20)C(25) derivatives of phosphatidylglycerol (PG), phosphatidylglycerol phosphate methyl ester (PGP-Me) and minor phospholipid components. No glycolipids were detected. The DNA G+C content of strain CG-1(T) was 62.1 mol%. DNA-DNA hybridization with N. amylolyticus DSM 10524(T), phylogenetically the most closely related species, was 39 %; this value showed that strain CG-1(T) constituted a different genospecies. The comparison of 16S rRNA gene sequences, detailed phenotypic characterization, polar lipid profile and DNA-DNA hybridization studies revealed that strain CG-1(T) belongs to the genus Natronococcus and constitutes a novel species for which the name Natronococcus roseus sp. nov. is proposed. The type strain is CG-1(T) (=CECT 7984(T)=IBRC-M 10656(T)=JCM 17958(T)).
Collapse
Affiliation(s)
- P Corral
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, 41012 Sevilla, Spain
| | - M C Gutiérrez
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, 41012 Sevilla, Spain
| | - A M Castillo
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, 41012 Sevilla, Spain
| | - M Domínguez
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, 41012 Sevilla, Spain
| | - P Lopalco
- Institute for Microelectronics and Microsystems, National Research Council (IMM-CNR) and Sens&Micro LAB, 73100 Lecce, Italy
| | - A Corcelli
- Department of Medical Biochemistry, Medical Biology and Medical Physics, University of Bari, 70124 Bari, Italy
| | - A Ventosa
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, 41012 Sevilla, Spain
| |
Collapse
|
13
|
Gutiérrez MC, Castillo AM, Corral P, Minegishi H, Ventosa A. Natronorubrum sediminis sp. nov., an archaeon isolated from a saline lake. Int J Syst Evol Microbiol 2009; 60:1802-1806. [PMID: 19767366 DOI: 10.1099/ijs.0.015602-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [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: 11/18/2022] Open
Abstract
Two novel haloalkaliphilic archaea, strains CG-6T and CG-4, were isolated from sediment of the hypersaline Lake Chagannor in Inner Mongolia, China. Cells of the two strains were pleomorphic, non-motile and strictly aerobic. They required at least 2.5 M NaCl for growth, with optimum growth at 3.4 M NaCl. They grew at pH 8.0-11.0, with optimum growth at pH 9.0. Hypotonic treatment with less than 1.5 M NaCl caused cell lysis. The two strains had similar polar lipid compositions, possessing C20C20 and C20C25 derivatives of phosphatidylglycerol and phosphatidylglycerol phosphate methyl ester. No glycolipids were detected. Comparison of 16S rRNA gene sequences and morphological features placed them in the genus Natronorubrum. 16S rRNA gene sequence similarities to strains of recognized species of the genus Natronorubrum were 96.2-93.8%. Detailed phenotypic characterization and DNA-DNA hybridization studies revealed that the two strains belong to a novel species in the genus Natronorubrum, for which the name Natronorubrum sediminis sp. nov. is proposed; the type strain is CG-6T (=CECT 7487T =CGMCC 1.8981T =JCM 15982T).
Collapse
Affiliation(s)
- M C Gutiérrez
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, 41012 Sevilla, Spain
| | - A M Castillo
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, 41012 Sevilla, Spain
| | - P Corral
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, 41012 Sevilla, Spain
| | - H Minegishi
- Bio-Nano Electronics Research Center, Toyo University, 2100 Kujirai, Kawagoe, Saitama 350-8585, Japan
| | - A Ventosa
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, 41012 Sevilla, Spain
| |
Collapse
|
14
|
Gutiérrez MC, Castillo AM, Kamekura M, Ventosa A. Haloterrigena salina sp. nov., an extremely halophilic archaeon isolated from a salt lake. Int J Syst Evol Microbiol 2009; 58:2880-4. [PMID: 19060076 DOI: 10.1099/ijs.0.2008/001602-0] [Citation(s) in RCA: 63] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A novel extremely halophilic strain, designated XH-65(T), isolated from the salt lake Xilinhot in Inner Mongolia, PR China, was subjected to a polyphasic taxonomic characterization. Strain XH-65(T) is neutrophilic, non-motile and requires at least 2.5 M NaCl for growth, with an optimum at 3.4 M NaCl, and grows at pH 6.0-9.0, with optimum growth at pH 7.5. Strain XH-65(T) grows at 25-50 degrees C, with optimal growth at 37 degrees C. Magnesium is not required for growth. On the basis of 16S rRNA gene sequence analysis, strain XH-65(T) was shown to belong to the genus Haloterrigena and was related to Haloterrigena turkmenica VKM B-1734(T) (98.1 % sequence similarity), Haloterrigena saccharevitans AB14(T) (96.9 %), Haloterrigena thermotolerans PR5(T) (96.3 %), Haloterrigena limicola AX-7(T) (95.8 %) and Haloterrigena hispanica FP1(T) (95.7 %). DNA-DNA hybridization revealed 37 % relatedness between strain XH-65(T) and Htg. turkmenica VKM B-1734(T). The polar lipid composition revealed the presence of phosphatidylglycerol, phosphatidylglycerol phosphate methyl ester and mannose-2,6-disulfate (1-->2)-glucose glycerol diether (S(2)-DGD). The results of the DNA-DNA hybridization and physiological and biochemical tests allowed genotypic and phenotypic differentiation of strain XH-65(T) from the six Haloterrigena species with validly published names. Therefore, strain XH-65(T) represents a novel species, for which the name Haloterrigena salina sp. nov. is proposed, with the type strain XH-65(T) (=CGMCC 1.6203(T) =JCM 13891(T)).
Collapse
Affiliation(s)
- M C Gutiérrez
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, Sevilla, Spain.
| | | | | | | |
Collapse
|
15
|
Gutiérrez MC, Castillo AM, Pagaling E, Heaphy S, Kamekura M, Xue Y, Ma Y, Cowan DA, Jones BE, Grant WD, Ventosa A. Halorubrum kocurii sp. nov., an archaeon isolated from a saline lake. Int J Syst Evol Microbiol 2008; 58:2031-5. [PMID: 18768599 DOI: 10.1099/ijs.0.65840-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A Gram-negative, non-motile, neutrophilic, rod-shaped, extremely halophilic archaeon, designated strain BG-1(T), was isolated from a salt lake, Lake Bagaejinnor, in Inner Mongolia, China. Strain BG-1(T) was able to grow at 25-55 degrees C, required at least 2.5 M NaCl for growth (with an optimum at 3.4 M NaCl) and grew at pH 6.0-9.0 (with an optimum at pH 7.5). Hypotonic treatment with less than 2.0 M NaCl caused cell lysis. Phylogenetic analysis of the almost-complete 16S rRNA gene sequence positioned the isolate within the genus Halorubrum in the family Halobacteriaceae. Strain BG-1(T) was most closely related to Halorubrum aidingense 31-hong(T) (98.8% sequence similarity), Halorubrum saccharovorum NCIMB 2081(T) (98.6%), Halorubrum lacusprofundi ACAM 34(T) (98.6%) and Halorubrum lipolyticum 9-3(T) (98.4%). However, values for DNA-DNA hybridization between strain BG-1(T) and the most closely related members of the genus Halorubrum were below 40%. Analysis of the polar lipids of strain BG-1(T) revealed the presence of mannosyl-2-sulfate-(1-4)-glycosyl-archaeol, the main glycolipid found in neutrophilic species of the genus Halorubrum. The G+C content of the genomic DNA was 69.4 mol% (T(m)). Comparison of the phenotypic characteristics of the strain with those of Halorubrum species supported the conclusion that BG-1(T) represents a novel species within this genus, for which the name Halorubrum kocurii sp. nov. is proposed. The type strain is BG-1(T) (=CECT 7322(T) =CGMCC 1.7018(T) =JCM 14978(T)).
Collapse
Affiliation(s)
- M C Gutiérrez
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, 41012 Sevilla, Spain.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
16
|
Soriano M, Cistué L, Castillo AM. Enhanced induction of microspore embryogenesis after n-butanol treatment in wheat (Triticum aestivum L.) anther culture. Plant Cell Rep 2008; 27:805-11. [PMID: 18214490 DOI: 10.1007/s00299-007-0500-y] [Citation(s) in RCA: 16] [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] [Subscribe] [Scholar Register] [Received: 11/09/2007] [Revised: 12/21/2007] [Accepted: 12/21/2007] [Indexed: 05/13/2023]
Abstract
The aim of this study was the improvement of embryo production in wheat anther culture. Three butanol alcohols, n-butanol, sec-butanol and tert-butanol, were evaluated for their effect on microspore embryogenesis in two spring cultivars of wheat, Pavon and Caramba. Application of n-butanol, at 0.1 and 0.2% (v/v) in the induction media for 5 h, highly improved embryo production in both cultivars. Sec- and tert-butanol performed similarly to control plates. Regeneration ability was unaffected by any butyl-alcohol treatment. As a consequence of the higher embryo production after n-butanol treatment, the number of green regenerated plants increased up to five times in cultivar Pavon and up to three times in cultivar Caramba. The percentage of green plants was improved or unaffected by the treatment. Doubled haploid plant production was between 2 and 4 times higher after n-butanol treatment than in control plates. Therefore, n-butanol was successfully applied in the production of wheat doubled haploids. This primary alcohol is known as an activator of phospholipase D and has been previously reported to disrupt cortical microtubules and detach them from the plasma membrane in plants. Its effects on androgenetic induction could confirm the importance of microtubule regulation in plant cell fate, specifically in microspore development. A possible implication of phospholipase D is discussed.
Collapse
Affiliation(s)
- M Soriano
- Departamento de Genética y Producción Vegetal, Estación Experimental Aula Dei, Consejo Superior de Investigaciones Científicas, Avda Montañana 1005, 50059 Zaragoza, Spain.
| | | | | |
Collapse
|
17
|
Gutiérrez MC, Castillo AM, Kamekura M, Xue Y, Ma Y, Cowan DA, Jones BE, Grant WD, Ventosa A. Halopiger xanaduensis gen. nov., sp. nov., an extremely halophilic archaeon isolated from saline Lake Shangmatala in Inner Mongolia, China. Int J Syst Evol Microbiol 2007; 57:1402-1407. [PMID: 17625165 DOI: 10.1099/ijs.0.65001-0] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [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: 11/18/2022] Open
Abstract
Strain SH-6(T) was isolated from the sediment of Lake Shangmatala, a saline lake in Inner Mongolia (China). Cells were pleomorphic. The organism was neutrophilic and required at least 2.5 M (15 %) NaCl, but not MgCl(2), for growth; optimal growth occurred at 4.3 M (25 %) NaCl. The G+C content of its DNA was 63.1 mol%. 16S rRNA gene sequence analysis revealed that strain SH-6(T) is a member of the family Halobacteriaceae, but there was a low level of similarity with other members of this family. Highest sequence similarity (94.6 %) was obtained with the 16S rRNA genes of the type strains of Natronolimnobius innermongolicus and Natronolimnobius baerhuensis. Polar lipid analyses revealed that strain SH-6(T) contains phosphatidylglycerol and phosphatidylglyceromethylphosphate, derived from both C(20)C(20) and C(20)C(25) glycerol diethers together with the glycolipid S(2)-DGD-1. On the basis of the data obtained, the new isolate could not be classified in any recognized genus. Strain SH-6(T) is thus considered to represent a novel species in a new genus within the family Halobacteriaceae, order Halobacteriales, for which the name Halopiger xanaduensis gen. nov., sp. nov. is proposed. The type strain of Halopiger xanaduensis is SH-6(T) (=CECT 7173(T)=CGMCC 1.6379(T)=JCM 14033(T)).
Collapse
MESH Headings
- Base Composition
- China
- DNA, Archaeal/chemistry
- DNA, Archaeal/isolation & purification
- DNA, Ribosomal/chemistry
- DNA, Ribosomal/isolation & purification
- Genes, rRNA
- Geologic Sediments/microbiology
- Halobacteriaceae/chemistry
- Halobacteriaceae/classification
- Halobacteriaceae/isolation & purification
- Halobacteriaceae/physiology
- Magnesium Chloride/metabolism
- Microscopy, Phase-Contrast
- Molecular Sequence Data
- Phospholipids/analysis
- Phylogeny
- RNA, Archaeal/genetics
- RNA, Ribosomal, 16S/genetics
- Sequence Analysis, DNA
- Sequence Homology, Nucleic Acid
- Sodium Chloride/metabolism
Collapse
Affiliation(s)
- M C Gutiérrez
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, 41012 Sevilla, Spain
| | - A M Castillo
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, 41012 Sevilla, Spain
| | - M Kamekura
- Noda Institute for Scientific Research, 399 Noda, Noda-shi, Chiba-ken 278-0037, Japan
| | - Y Xue
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, 100080 Beijing, China
| | - Y Ma
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, 100080 Beijing, China
| | - D A Cowan
- Department of Biotechnology, University of the Western Cape, Bellville 7535, Cape Town, South Africa
| | - B E Jones
- Genencor International BV, Archimedesweg 30, 2333 CN Leiden, The Netherlands
| | - W D Grant
- Department of Infection, Immunity and Inflammation, University of Leicester, Leicester LE1 9HN, UK
| | - A Ventosa
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, 41012 Sevilla, Spain
| |
Collapse
|
18
|
Castillo AM, Gutiérrez MC, Kamekura M, Xue Y, Ma Y, Cowan DA, Jones BE, Grant WD, Ventosa A. Halovivax ruber sp. nov., an extremely halophilic archaeon isolated from Lake Xilinhot, Inner Mongolia, China. Int J Syst Evol Microbiol 2007; 57:1024-1027. [PMID: 17473252 DOI: 10.1099/ijs.0.64899-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [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: 11/18/2022] Open
Abstract
A Gram-negative, pleomorphic, extremely halophilic archaeon, designated strain XH-70(T), was isolated from the saline Lake Xilinhot, in Inner Mongolia, China. It formed small (0.9-1.5 mm), red-pigmented, elevated colonies on agar medium. The strain required at least 2.5 M NaCl and 5 mM Mg(2+) for growth. The 16S rRNA gene sequence analysis indicated that strain XH-70(T) belongs to the family Halobacteriaceae, showing 99.5 % similarity to the type strain of Halovivax asiaticus and 94.7 and 94.6 % similarity, respectively, to the type strains of Natronococcus amylolyticus and Natronococcus occultus. Polar lipid analysis supported the placement of strain XH-70(T) in the genus Halovivax. DNA-DNA hybridization studies (32 % with Halovivax asiaticus CGMCC 1.4248(T)), as well as biochemical and physiological characterization, allowed strain XH-70(T) to be differentiated from Halovivax asiaticus. A novel species, Halovivax ruber sp. nov., is therefore proposed to accommodate this strain. The type strain is XH-70(T) (=CGMCC 1.6204(T)=DSM 18193(T)=JCM 13892(T)).
Collapse
MESH Headings
- Anti-Bacterial Agents/pharmacology
- Carbohydrate Metabolism
- China
- DNA, Archaeal/chemistry
- DNA, Archaeal/isolation & purification
- DNA, Ribosomal/chemistry
- DNA, Ribosomal/isolation & purification
- Genes, rRNA
- Halobacteriaceae/chemistry
- Halobacteriaceae/classification
- Halobacteriaceae/isolation & purification
- Halobacteriaceae/physiology
- Membrane Lipids/analysis
- Microscopy, Phase-Contrast
- Molecular Sequence Data
- Nucleic Acid Hybridization
- Phylogeny
- RNA, Archaeal/genetics
- RNA, Ribosomal, 16S/genetics
- Saline Solution, Hypertonic/metabolism
- Sequence Analysis, DNA
- Sequence Homology, Nucleic Acid
- Sodium Chloride/metabolism
- Water Microbiology
Collapse
Affiliation(s)
- A M Castillo
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, 41012 Sevilla, Spain
| | - M C Gutiérrez
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, 41012 Sevilla, Spain
| | - M Kamekura
- Noda Institute for Scientific Research, 399 Noda, Noda-shi, Chiba-ken 278-0037, Japan
| | - Y Xue
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, 100080 Beijing, China
| | - Y Ma
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, 100080 Beijing, China
| | - D A Cowan
- Department of Biotechnology, University of the Western Cape, Bellville 7535, Cape Town, South Africa
| | - B E Jones
- Genencor International BV, Archimedesweg 30, 2333 CN Leiden, The Netherlands
| | - W D Grant
- Department of Infection, Immunity and Inflammation, University of Leicester, Leicester LE1 9HN, UK
| | - A Ventosa
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, 41012 Sevilla, Spain
| |
Collapse
|
19
|
Castillo AM, Gutiérrez MC, Kamekura M, Xue Y, Ma Y, Cowan DA, Jones BE, Grant WD, Ventosa A. Halorubrum orientale sp. nov., a halophilic archaeon isolated from Lake Ejinor, Inner Mongolia, China. Int J Syst Evol Microbiol 2007; 56:2559-2563. [PMID: 17082390 DOI: 10.1099/ijs.0.64420-0] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [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: 11/18/2022] Open
Abstract
A motile, pleomorphic, red-pigmented archaeon, strain EJ-52T, was isolated from water from Lake Ejinor, a saline lake in Inner Mongolia, China. Analysis of the almost-complete 16S rRNA gene sequence showed that the isolate was phylogenetically related to species of the genus Halorubrum, being most closely related to Halorubrum saccharovorum ATCC 29252T (96.1% sequence similarity), Halorubrum lacusprofundi JCM 8891T (95.9%), Halorubrum tibetense AS 1.3239T (95.2%), Halorubrum alcaliphilum AS 1.3528T (95.2%) and Halorubrum vacuolatum JCM 9060T (95.1%). The polar lipids of strain EJ-52T were C20C20 derivatives of phosphatidylglycerol phosphate and phosphatidylglycerol phosphate methyl ester and a sulfated diglycosyl diether. Strain EJ-52T requires at least 2.5 M NaCl for growth and grows optimally at 3.4 M NaCl. The strain grows at 25-50 degrees C, with optimal growth occurring at 35-45 degrees C. Mg2+ is not required. The DNA G+C content is 64.2 mol%. On the basis of the data obtained in this study, strain EJ52T represents a novel species, for which the name Halorubrum orientale sp. nov. is proposed. The type strain is EJ-52T (=CECT 7145T=JCM 13889T=CGMCC 1.6295T).
Collapse
MESH Headings
- Base Composition
- China
- DNA, Archaeal/chemistry
- DNA, Archaeal/genetics
- DNA, Archaeal/isolation & purification
- DNA, Ribosomal/chemistry
- DNA, Ribosomal/isolation & purification
- Genes, rRNA
- Halobacteriaceae/classification
- Halobacteriaceae/cytology
- Halobacteriaceae/isolation & purification
- Halobacteriaceae/physiology
- Lipids/analysis
- Lipids/chemistry
- Magnesium/metabolism
- Molecular Sequence Data
- Movement
- Phylogeny
- Pigments, Biological/analysis
- RNA, Ribosomal, 16S/genetics
- Sequence Analysis, DNA
- Sequence Homology, Nucleic Acid
- Sodium Chloride/analysis
- Sodium Chloride/metabolism
- Temperature
- Water Microbiology
Collapse
Affiliation(s)
- A M Castillo
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, 41012 Sevilla, Spain
| | - M C Gutiérrez
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, 41012 Sevilla, Spain
| | - M Kamekura
- Noda Institute for Scientific Research, 399 Noda, Noda-shi, Chiba-ken 278-0037, Japan
| | - Y Xue
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, 100080 Beijing, China
| | - Y Ma
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, 100080 Beijing, China
| | - D A Cowan
- Department of Biotechnology, University of the Western Cape, Bellville 7535, Cape Town, South Africa
| | - B E Jones
- Genencor International BV, Archimedesweg 30, 2333 CN Leiden, The Netherlands
| | - W D Grant
- Department of Infection, Immunity and Inflammation, University of Leicester, Leicester LE1 9HN, UK
| | - A Ventosa
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, 41012 Sevilla, Spain
| |
Collapse
|
20
|
Castillo AM, Gutiérrez MC, Kamekura M, Ma Y, Cowan DA, Jones BE, Grant WD, Ventosa A. Halovivax asiaticus gen. nov., sp. nov., a novel extremely halophilic archaeon isolated from Inner Mongolia, China. Int J Syst Evol Microbiol 2006; 56:765-770. [PMID: 16585691 DOI: 10.1099/ijs.0.63954-0] [Citation(s) in RCA: 49] [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: 11/18/2022] Open
Abstract
Strain EJ-46T, a novel pleomorphic, aerobic, extremely halophilic member of the Archaea was isolated from sediment of the saline Lake Ejinor, in Inner Mongolia, China. This organism was neutrophilic and required at least 15 % (2.5 M) NaCl for growth. MgCl2 was not required. The isolate was able to grow at pH 6.0-9.0. Optimum growth occurred in media containing 20 % (3.4 M) NaCl at pH 7.0-7.5. Polar lipid analysis revealed the presence of phosphatidylglycerol and phosphatidylglycerol phosphate methyl ester, derived from both C20C20 and C20C25 glycerol diethers. Four glycolipids were detected, one of which may be novel. The DNA G+C content was 60.3 mol%. 16S rRNA gene analysis revealed that strain EJ-46T was a member of the phylogenetic group defined by the family Halobacteriaceae, and the highest 16S rRNA gene similarity values of 94.9 and 94.8 % were obtained with the haloalkaliphilic species of the genus Natronococcus, Natronococcus occultus and Natronococcus amylolyticus, respectively. Based on the phenotypic, genotypic and phylogenetic analyses, it is proposed that the novel isolate should be classified as representing a new genus and species, for which the name Halovivax asiaticus gen. nov., sp. nov. is proposed. The type strain is EJ-46T (=CGMCC 1.4248T = CECT 7098T).
Collapse
Affiliation(s)
- A M Castillo
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, 41012 Sevilla, Spain
| | - M C Gutiérrez
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, 41012 Sevilla, Spain
| | - M Kamekura
- Noda Institute for Scientific Research, 399 Noda, Noda-shi, Chiba-ken 278-0037, Japan
| | - Y Ma
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, 100080 Beijing, China
| | - D A Cowan
- Department of Biotechnology, University of the Western Cape, Bellville 7535, Cape Town, South Africa
| | - B E Jones
- Genencor International BV, Archimedesweg 30, 2333 CN Leiden, The Netherlands
| | - W D Grant
- Department of Infection, Immunity and Inflammation, University of Leicester, Leicester LE1 9HN, UK
| | - A Ventosa
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, 41012 Sevilla, Spain
| |
Collapse
|
21
|
Castillo AM, Gutiérrez MC, Kamekura M, Xue Y, Ma Y, Cowan DA, Jones BE, Grant WD, Ventosa A. Natrinema ejinorense sp. nov., isolated from a saline lake in Inner Mongolia, China. Int J Syst Evol Microbiol 2006; 56:2683-2687. [PMID: 17082411 DOI: 10.1099/ijs.0.64421-0] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [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: 11/18/2022] Open
Abstract
A Gram-negative, non-motile, neutrophilic, pleomorphic and extremely halophilic archaeon, strain EJ-57T, was isolated from saline Lake Ejinor in Inner Mongolia, China. Strain EJ-57T was able to grow at 25–50 °C, required at least 1.8 M NaCl for growth (optimum at 3.4 M NaCl) and grew over a pH range from 6.0 to 8.5 (optimum at pH 7.0). Hypotonic treatment with less than 1.5 M NaCl caused cell lysis. Analysis of the almost complete 16S rRNA gene sequence indicated that the isolate represented a member of the genus Natrinema in the family Halobacteriaceae. Strain EJ-57T was most closely related to Natrinema versiforme JCM 10478T (96.2 % sequence similarity), Natrinema pallidum NCIMB 777T (95.9 % sequence similarity), Natrinema altunense JCM 12890T (95.8 % sequence similarity) and Natrinema pellirubrum NCIMB 786T (95.5 % sequence similarity). However, DNA–DNA hybridization experiments showed that strain EJ-57T was not related to these species, with levels of DNA–DNA relatedness equal to or below 39 %. The major polar lipids of the isolate were C20C20 and C20C25 derivatives of phosphatidylglycerol, phosphatidylglycerol phosphate methyl ester and the disulfated glycolipid S2-DGA-1. The G+C content of the genomic DNA was 64.7 mol%. Comparative analysis of phenotypic characteristics between strain EJ-57T and recognized Natrinema species supported the conclusion that EJ-57T represents a novel species within this genus, for which the name Natrinema ejinorense sp. nov. is proposed. The type strain is EJ-57T (=CECT 7144T=JCM 13890T=CGMCC 1.6202T).
Collapse
MESH Headings
- Base Composition
- Carbohydrate Metabolism
- China
- DNA, Archaeal/chemistry
- DNA, Archaeal/isolation & purification
- DNA, Ribosomal/chemistry
- DNA, Ribosomal/isolation & purification
- Gelatin/metabolism
- Genes, rRNA
- Halobacteriaceae/classification
- Halobacteriaceae/cytology
- Halobacteriaceae/isolation & purification
- Halobacteriaceae/physiology
- Hydrogen Sulfide/metabolism
- Hydrogen-Ion Concentration
- Lipids/analysis
- Molecular Sequence Data
- Movement
- Nucleic Acid Hybridization
- Phylogeny
- RNA, Ribosomal, 16S/genetics
- Saline Solution, Hypertonic
- Sequence Analysis, DNA
- Sequence Homology, Nucleic Acid
- Sodium Chloride/metabolism
- Starch/metabolism
- Temperature
- Water Microbiology
Collapse
Affiliation(s)
- A M Castillo
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, 41012 Sevilla, Spain
| | - M C Gutiérrez
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, 41012 Sevilla, Spain
| | - M Kamekura
- Noda Institute for Scientific Research, 399 Noda, Noda-shi, Chiba-ken 278-0037, Japan
| | - Y Xue
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, 100080 Beijing, China
| | - Y Ma
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, 100080 Beijing, China
| | - D A Cowan
- Department of Biotechnology, University of the Western Cape, Bellville 7535, Cape Town, South Africa
| | - B E Jones
- Genencor International BV, Archimedesweg 30, 2333 CN Leiden, The Netherlands
| | - W D Grant
- Department of Infection, Immunity and Inflammation, University of Leicester, Leicester LE1 9HN, UK
| | - A Ventosa
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Sevilla, 41012 Sevilla, Spain
| |
Collapse
|
22
|
Castillo AM, Gutiérrez MC, Kamekura M, Xue Y, Ma Y, Cowan DA, Jones BE, Grant WD, Ventosa A. Halostagnicola larsenii gen. nov., sp. nov., an extremely halophilic archaeon from a saline lake in Inner Mongolia, China. Int J Syst Evol Microbiol 2006; 56:1519-1524. [PMID: 16825623 DOI: 10.1099/ijs.0.64286-0] [Citation(s) in RCA: 40] [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: 11/18/2022] Open
Abstract
Strain XH-48T was isolated from the sediment of Lake Xilinhot, a saline lake in Inner Mongolia (China). The organism is pleomorphic, neutrophilic and requires at least 2.5 M (15 %) NaCl, but not MgCl2, for growth; it exhibits optimal growth at 3.4 M (20 %) NaCl. The G+C content of its DNA is 61 mol%. 16S rRNA gene sequence analysis revealed that strain XH-48T is a member of the family Halobacteriaceae, but there were low levels of similarity with other members of this family. The highest sequence similarity values (94.5 and 93.3 %) were obtained with the 16S rRNA genes of Natrialba aegyptiaca and Natrialba asiatica, respectively. Polar lipid analyses revealed that strain XH-48T contains phosphatidylglycerol and phosphatidylglyceromethylphosphate, derived from both C20C20 and C20C25 glycerol diethers, and two unidentified glycolipids. On the basis of the data obtained, the novel isolate cannot be classified within any recognized genus. Strain XH-48T should be placed within a novel genus and species within the family Halobacteriaceae, order Halobacteriales, for which the name Halostagnicola larsenii gen. nov., sp. nov. is proposed. The type strain of Halostagnicola larsenii is strain XH-48T (=DSM 17691T=CGMCC 1.5338T=JCM 13463T=CECT 7116T).
Collapse
MESH Headings
- Aerobiosis
- Anaerobiosis
- Base Composition
- China
- DNA, Archaeal/chemistry
- DNA, Archaeal/isolation & purification
- DNA, Ribosomal/chemistry
- DNA, Ribosomal/isolation & purification
- Enzymes/analysis
- Genes, rRNA
- Geologic Sediments/microbiology
- Halobacteriaceae/classification
- Halobacteriaceae/cytology
- Halobacteriaceae/genetics
- Halobacteriaceae/isolation & purification
- Halobacteriaceae/physiology
- Lipids/chemistry
- Lipids/isolation & purification
- Magnesium Chloride/metabolism
- Microscopy, Phase-Contrast
- Molecular Sequence Data
- Mongolia
- Phylogeny
- RNA, Archaeal/genetics
- RNA, Ribosomal, 16S/genetics
- Sequence Analysis, DNA
- Sequence Homology, Nucleic Acid
- Sodium Chloride/metabolism
- Water Microbiology
Collapse
Affiliation(s)
- A M Castillo
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Seville, 41012 Seville, Spain
| | - M C Gutiérrez
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Seville, 41012 Seville, Spain
| | - M Kamekura
- Noda Institute for Scientific Research, 399 Noda, Noda-shi, Chiba-ken 278-0037, Japan
| | - Y Xue
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, 100080 Beijing, P. R. China
| | - Y Ma
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, 100080 Beijing, P. R. China
| | - D A Cowan
- Department of Biotechnology, University of the Western Cape, Bellville 7535, Cape Town, South Africa
| | - B E Jones
- Genencor International BV, Archimedesweg 30, 2333 CN Leiden, The Netherlands
| | - W D Grant
- Department of Infection, Immunity and Inflammation, University of Leicester, Leicester LE1 9HN, UK
| | - A Ventosa
- Department of Microbiology and Parasitology, Faculty of Pharmacy, University of Seville, 41012 Seville, Spain
| |
Collapse
|
23
|
Cistué L, Soriano M, Castillo AM, Vallés MP, Sanz JM, Echávarri B. Production of doubled haploids in durum wheat (Triticum turgidum L.) through isolated microspore culture. Plant Cell Rep 2006; 25:257-64. [PMID: 16220343 DOI: 10.1007/s00299-005-0047-8] [Citation(s) in RCA: 12] [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] [Subscribe] [Scholar Register] [Received: 03/30/2005] [Revised: 06/30/2005] [Accepted: 07/17/2005] [Indexed: 05/04/2023]
Abstract
The objective of this work was to produce doubled haploid plants from durum wheat through the induction of androgenesis. A microspore culture technique was developed and used to produce fertile doubled haploid plants of agronomic interest. Five cultivars, one selected line, plus a collection of 20 F(1) crosses between different genotypes of high breeding value were used. Studies on several factors such as pre-treatments and media components were carried out in order to develop a protocol to regenerate green haploid plantlets. Anthers were pre-treated in 0.7 M mannitol. Microspores, from anther maceration, were plated on a C(17) induction culture medium with ovary co-culture. The optimum regeneration medium J25-8 was used. From 35 microspore isolations, 407 green plantlets were obtained. With this technique mature embryos were obtained. Green plants were regenerated from all genotypes used and approximately 67% of them were spontaneously doubled haploids. Some haploids and a very few polyploids plants were obtained. From the 407 plants, 275 were completely fertile and gave enough seeds to be assayed in the field. This protocol could be used complementary to or instead of the intergeneric crossing with maize as an economically feasible method to obtain doubled haploids from most durum wheat genotypes.
Collapse
Affiliation(s)
- L Cistué
- Departamento de Genética y Producción Vegetal, Estación Experimental de Aula Dei, Consejo Superior de Investigaciones Científicas, Avda. Montañana 1005, 50059 Zaragoza, Spain.
| | | | | | | | | | | |
Collapse
|
24
|
Baca P, Castillo AM, Bravo M, Junco P, Baca AP, Llodra JC. Mutans streptococci and lactobacilli in saliva after the application of fissure sealants. Oper Dent 2002; 27:107-11. [PMID: 11931131] [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: 02/24/2023]
Abstract
Because dental fissures may serve as reservoirs for mutans streptococci, preventive measures should be taken to control microbial concentrations at these sites. This study estimated the influence that sealing permanent first molars would have on the levels of mutans streptococci and lactobacilli in saliva of healthy seven-year-old schoolchildren. Permanent first molars were sealed in 31 children without caries (NC group) and in 32 children with caries (C group). None of the children had caries in their permanent first molars. Conventional methods were used to count mutans streptococci and lactobacilli in saliva before applying the sealant and again at 4 and 12 weeks after application. Baseline counts of lactobacilli and mutans streptococci were significantly higher in the C group. A significant reduction in mutans streptococci was observed in the NC group at 4 and 12 weeks. It was concluded that fissure sealants in permanent first molars can help reduce salivary levels of mutans streptococci in children without caries.
Collapse
Affiliation(s)
- P Baca
- School of Dentistry, University of Granada, Spain
| | | | | | | | | | | |
Collapse
|
25
|
Castillo AM, Cistué L, Romagosa I, Vallés MP. Low responsiveness of six-rowed genotypes to androgenesis in barley does not have a pleiotropic basis. Genome 2001. [DOI: 10.1139/g01-034] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A heterozygous mutant for the two- and six-rowed character was isolated in the barley cultivar Igri through application of sodium azide to isolated microspore cultures and posterior regeneration. Six-rowed and two-rowed homozygotic plants were subsequently identified in the self-pollinated M2progenies of the original heterozygous M1. Detailed molecular markers confirmed the isogenic nature of this recovered mutant and the original cultivar Igri. A comparative study of the anther culture response of this six-rowed induced mutant vs. diploid 'Igri' was performed to assess whether the two- or six-rowed gene influences anther culture response in barley through a pleiotropic effect or via linkage disequilibrium. No significant differences for any of the recorded variables throughout the in vitro regeneration process were detected between the 'Igri' six-rowed mutant and any of their two-rowed isogenic lines. This suggests that row-type association with anther culture response in barley cultivars is due to the effect of a tight linkage with other genes directly responsible for androgenic response.Key words: androgenesis, barley, linkage, mutation, pleiotropy, vrs1 locus.
Collapse
|
26
|
Castillo AM, Cistué L, Vallés MP. Low responsiveness of six-rowed genotypes to androgenesis in barley does not have a pleiotropic basis. Genome 2001; 44:936-40. [PMID: 11681619] [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: 02/22/2023]
Abstract
A heterozygous mutant for the two- and six-rowed character was isolated in the barley cultivar Igri through application of sodium azide to isolated microspore cultures and posterior regeneration. Six-rowed and two-rowed homozygotic plants were subsequently identified in the self-pollinated M2 progenies of the original heterozygous M1. Detailed molecular markers confirmed the isogenic nature of this recovered mutant and the original cultivar Igri. A comparative study of the anther culture response of this six-rowed induced mutant vs. diploid 'Igri' was performed to assess whether the two- or six-rowed gene influences anther culture response in barley through a pleiotropic effect or via linkage disequilibrium. No significant differences for any of the recorded variables throughout the in vitro regeneration process were detected between the 'Igri' six-rowed mutant and any of their two-rowed isogenic lines. This suggests that row-type association with anther culture response in barley cultivars is due to the effect of a tight linkage with other genes directly responsible for androgenic response.
Collapse
Affiliation(s)
- A M Castillo
- Departamento de Genética y Producción Vegetal, Estación Experimental de Aula Dei, CSIC, Zaragoza, Spain
| | | | | |
Collapse
|
27
|
Castillo AM, Cistué L, Vallés MP, Sanz JM, Romagosa I, Molina-Cano JL. Efficient production of androgenic doubled-haploid mutants in barley by the application of sodium azide to anther and microspore cultures. Plant Cell Rep 2001; 20:105-111. [PMID: 30759895 DOI: 10.1007/s002990000289] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The aim of this study was to establish a protocol for an efficient production of agronomical and/or physiological mutants from model (cvs. Igri and Cobra) and low-androgenic-responding (cv. Volga) cultivars of barley through the application of a mutagenic agent, sodium azide, to anthers and isolated microspores cultured in vitro. This technology offers the possibilities of screening for recessive mutants in the first generation, selecting for novel genotypes from very large haploid populations, avoiding chimerism and rapidly fixing selected genotypes as fertile true breeding lines. The mutagenic treatment, 10-3-10-5 M sodium azide, was applied during the anther induction pre-treatment or immediately after the microspore isolation procedure. Out of 616 M2 doubled-haploid lines characterised under field conditions, a total of 63 morphological and developmental independent mutant lines were identified. The percentage of M2 doubled-haploid lines carrying mutations per line analysed was 3.8% when 10-4 M sodium azide was applied to anthers from the low-responding cv. Volga; this increased to 8.6% and 15.6% when 10-5 and 10-4 M sodium azide were applied to freshly isolated microspores from model cultivars.
Collapse
Affiliation(s)
- A M Castillo
- Departamento de Genética y Producción Vegetal, Estación Experimental de Aula Dei, CSIC, Apartado 202, 50080 Zaragoza, Spain e-mail: , , , , , , ES
| | - L Cistué
- Departamento de Genética y Producción Vegetal, Estación Experimental de Aula Dei, CSIC, Apartado 202, 50080 Zaragoza, Spain e-mail: , , , , , , ES
| | - M P Vallés
- Departamento de Genética y Producción Vegetal, Estación Experimental de Aula Dei, CSIC, Apartado 202, 50080 Zaragoza, Spain e-mail: , , , , , , ES
| | - J M Sanz
- Departamento de Genética y Producción Vegetal, Estación Experimental de Aula Dei, CSIC, Apartado 202, 50080 Zaragoza, Spain e-mail: , , , , , , ES
| | - I Romagosa
- Universitat de Lleida-Institut de Recerca i Tecnologia Agroalimentàries, Av. Rovira Roure 177, 25196 Lleida, Spain, , , , , , ES
| | - J L Molina-Cano
- Universitat de Lleida-Institut de Recerca i Tecnologia Agroalimentàries, Av. Rovira Roure 177, 25196 Lleida, Spain, , , , , , ES
| |
Collapse
|
28
|
Abstract
OBJECTIVE This study evaluated superoxide dismutase activity released from human umbilical veins incubated with different doses of heparin and examined at different time points. STUDY DESIGN Umbilical veins of fresh cords from full term babies were incubated with 175 or 1 U/ml of heparin at one end while the other end was incubated without heparin as control. Specimens were obtained at 10 minutes and 24 hours (high-dose) or at 10 minutes and 60 minutes (low-dose). Superoxide dismutase activity was measured by the cytochrome c method. Results were analyzed using Student's paired t test. RESULTS A time-dependent release of superoxide dismutase activity into the buffer was observed in both heparin specimens as well as in control specimens. The difference in release in the presence of heparin was of statistical significance, compared with the controls. CONCLUSION Because heparin is routinely used as an anticoagulant to maintain the patency of umbilical catheters, we conclude that this usage may alter a newborn's response to oxygen free radical damage by changes in superoxide dismutase activity.
Collapse
Affiliation(s)
- Z A Gill
- Department of Pediatrics, New York Medical College, Westchester Medical Center, Valhalla 10595, USA
| | | | | | | |
Collapse
|
29
|
Castillo AM, Egaña B, Sanz JM, Cistué L. Somatic embryogenesis and plant regeneration from barley cultivars grown in Spain. Plant Cell Rep 1998; 17:902-906. [PMID: 30736565 DOI: 10.1007/s002990050506] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Thirty-two barley cultivars grown in Spain, 18 of the two-row type and 14 of the six-row type, were screened for plant regeneration from cultured immature embryos. Although there was much variation in regeneration capacity among the cultivars, plants were obtained from all cultivars except Almunia. No statistical differences were found in the percentage of regeneration between two- and six-row types. The influence of the auxins 2,4-dichlorophenoxyacetic acid, dicamba, and picloram on the induction and maintenance of embryogenesis and regeneration capacity after 3-4 months in culture, were evaluated for cultivars Cobra, Hop and Reinette. Hop had the highest rates of maintenance of embryogenic capacity and plant regeneration. The medium containing dicamba gave the best embryogenic callus induction, maintenance and regeneration. Five regeneration media, differing in growth regulators and micronutrient composition, as well as partial desiccation of the calli before regeneration, were tested. The regeneration medium containing 10 μM copper sulfate gave the best results. Regeneration frequencies after 3-4 months in culture of cultivar Hop were raised from 59.5 to 93.7% in this medium. Silver nitrate and partial desiccation of the calli also enhanced plant regeneration, but the medium containing 10 μM of silver nitrate reduced root formation.
Collapse
Affiliation(s)
- A M Castillo
- Dpto. Genética y Producción Vegetal, Estación Experimental de Aula Dei. Apdo. 202, E-50080 Zaragoza, Spain Fax: +34-76-575620 e-mail: , , , , , , ES
| | - B Egaña
- Dpto. Genética y Producción Vegetal, Estación Experimental de Aula Dei. Apdo. 202, E-50080 Zaragoza, Spain Fax: +34-76-575620 e-mail: , , , , , , ES
| | - J M Sanz
- Dpto. Genética y Producción Vegetal, Estación Experimental de Aula Dei. Apdo. 202, E-50080 Zaragoza, Spain Fax: +34-76-575620 e-mail: , , , , , , ES
| | - L Cistué
- Dpto. Genética y Producción Vegetal, Estación Experimental de Aula Dei. Apdo. 202, E-50080 Zaragoza, Spain Fax: +34-76-575620 e-mail: , , , , , , ES
| |
Collapse
|
30
|
Castillo AM, Lagunes R, Urban M, Frixione E, Meza I. Myosin II-actin interaction in MDCK cells: role in cell shape changes in response to Ca2+ variations. J Muscle Res Cell Motil 1998; 19:557-74. [PMID: 9682142 DOI: 10.1023/a:1005316711538] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Cultured MDCK cell monolayers respond to a low level of extracellular calcium ([Ca2+]e < or = 5 microM) with a loss of transepithelial electrical resistance and transport function, and changes in position of a circumferential ring of actin filaments tethered to the plasma membrane at the zonula adhaerens. Keeping this cytoskeletal structure in place seems necessary to preserve the architecture of the tight junctions and therefore their sealing capacity. All three effects are reversible upon restituting normal [Ca2+]e. Recent work provided evidence of actin-myosin interactions at the filament ring, thus suggesting a contraction process involved in the alteration of the actin cytoskeleton. We now report that active contraction does occur and causes an extensive morphological transformation of MDCK cells. A marked increase in cell height simultaneous with a decrease in width and area of contact to the substratum was seen within 10 min of removal of [Ca2+]e; recovery began immediately after replacing calcium, although it took longer for completion. Conventional and confocal epifluorescence studies showed actin colocalized with myosin II at various planes of resting or contracted cells, in particular at the ring level. Electron-micrographs revealed the circumferential actin ring associated with the plasma membrane in a waist-like constriction where Ca2+ was removed from the cultures. Contraction, as well as relaxation, in response to [Ca2+]e variations were inhibited by cytochalasin-D (an actin-filament disrupting drug), by okadaic acid( an inhibitor of myosin light-chain dephosphorylation), and by 2,3-butanedione monoxime (a blocker of myosin II ATPase activity). Similarly, no response was observed in cells previously depleted of metabolic energy by 2,4-dinitrophenol and 2-deoxy-D-glucose preincubation. The actin-myosin mediated reversible structural transformation of MDCK cells in response to [Ca2+]3 poses new questions for the interpretation of in vitro experiments, as well as for the understanding of epithelial function.
Collapse
Affiliation(s)
- A M Castillo
- Departamento de Biología Celular, Centro de Investigación y de Estudios Avanzados del IPN, México, DF, Mexico
| | | | | | | | | |
Collapse
|
31
|
Montes de Oca G, Lezama RA, Mondragón R, Castillo AM, Meza I. Myosin I interactions with actin filaments and trans-Golgi-derived vesicles in MDCK cell monolayers. Arch Med Res 1997; 28:321-8. [PMID: 9291625] [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: 02/05/2023]
Abstract
In MDCK cell cultured monolayers, as well as in natural and other cultured epithelia, the proper organization of the actin filament ring, tethered to the plasma membrane at the zonula adhaerens, is apparently necessary for their functioning as a transporting epithelium. It has been proposed that actin filaments, in conjunction with motor proteins, could provide the structural basis that regulates the tight junction (TJ) sealing capacity as well as the transport of membrane-tagged proteins required for cell polarization. To test this hypothesis, the authors analyzed the localization and possible association of the actin-binding motor protein myosin I with actin filaments during changes in the actin ring position and organization, and also with trans-Golgi-derived vesicles. Modifications of the ring were induced subjecting the cells to external Ca2+ depletion and restoration (Ca2+ switch), or by treatment with drugs known to depolymerize actin filaments (cytochalasin D, CD). The distribution of myosin I and actin, both in intact cells and in cellular fractions, was monitored using heterologous cross-reacting antibodies and phalloidin. The authors identified an isoform of myosin I of approximately 110-125 KDa, homologous to myosin IB of Acanthamoeba, a fraction of which colocalized with the peripheral actin ring. The association seems transient as, once the ring retracted as result of Ca2+ depletion, or became disorganized by CD, myosin not longer colocalized with the actin fibers but appeared dispersed in the cytoplasm. Furthermore, a significant fraction of the total myosin I in the cell was associated to Golgi-derived vesicles which could also associate in vitro with actin filaments. The authors' data support, then, the participation of myosin I, in association with actin filaments, in vesicle translocation to and from the cell membrane as proposed for natural epithelia, and provide a further insight into the structural organization that maintains epithelial cell polarity in cultured monolayers.
Collapse
Affiliation(s)
- G Montes de Oca
- Departamento de Biología Celular y Programa de Biomedicina Molecular, Centro de Investigación y de Estudios Avanzados, (CINVESTAV) del Instituto Politécnico Nacional, México, D.F
| | | | | | | | | |
Collapse
|
32
|
Cistué L, Ramos A, Castillo AM, Romagosa I. Production of large number of doubled haploid plants from barley anthers pretreated with high concentrations of mannitol. Plant Cell Rep 1994; 13:709-712. [PMID: 24193525 DOI: 10.1007/bf00231629] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/1994] [Revised: 04/08/1994] [Indexed: 06/02/2023]
Abstract
Pretreatment with increasing concentrations of mannitol, from 0.3 to 0.7 M, was used to induce stress in cultured anthers of barley (Hordeum vulgare L.). Three cultivars with varying degrees of androgenetic ability were studied. A positive linear relationship was found between concentration of mannitol in the pretreatment medium and the number of regenerated green doubled haploid plants in all the cultivars. The pretreatment also resulted in an increasing proportion of embryos to dividing microspores, and in green to albino plantlets. The optimum length of the pretreatment seemed to be genotype dependent. When Ficoll was used as an alternative stress agent a differential genotype response was observed.
Collapse
Affiliation(s)
- L Cistué
- Departamento de Genética y Producción Vegetal, Estación Experimental de Aula Dei, Apartado 202, E-50080, Zaragoza, Spain
| | | | | | | |
Collapse
|
33
|
García-Mendoza A, Liébana J, Castillo AM, de la Higuera A, Piédrola G. Evaluation of the capacity of oral streptococci to produce hydrogen peroxide. J Med Microbiol 1993; 39:434-9. [PMID: 8246261 DOI: 10.1099/00222615-39-6-434] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.4] [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: 01/29/2023] Open
Abstract
The capacity of 11 strains of oral streptococcal species (Streptococcus sanguis, S. oralis, S. mitis and S. sobrinus) to produce hydrogen peroxide (H2O2) was studied in vitro. Detection of this property in solid media, particularly with trypticase soy agar-benzidine-peroxidase, was more sensitive than in liquid media. The addition of carbohydrates (arabinose, xylose, mannose, sorbose and lactose), sorbitol and saccharine to buffered trypticase soy broth increased H2O2 production in S. oralis NCTC 11427, although the concentrations obtained with some substrates (glucose, galactose, mannitol and xylitol) were lower than those obtained in controls. In S. sanguis NCTC 7863, H2O2 production was detected only with galactose, sorbitol, lactose and saccharin.
Collapse
Affiliation(s)
- A García-Mendoza
- Department of Microbiology, School of Medicine, University of Granada, Spain
| | | | | | | | | |
Collapse
|
34
|
Castillo AM, Cistué L. Production of gynogenic haploids of Hordeum vulgare L. Plant Cell Rep 1993; 12:139-143. [PMID: 24196850 DOI: 10.1007/bf00239094] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/1992] [Revised: 11/13/1992] [Indexed: 06/02/2023]
Abstract
Haploid plants were regenerated from cultured unfertilized ovaries of Hordeum vulgare L. (barley). Optimal response was obtained by the addition of 0.6 μM 4-chloro-2-methylphenoxyacetic acid (MCPA), 2.8 μM indole-3-acetic acid (IAA) and 4.4 μM 6-benzyladenine (BA) in the N6 medium. Further increase in the rate of callus formation and the number of green plants produced was possible with the addition of 90 g/l sucrose and 100 g/l coconut water. The stage of development of the ovaries at the time of culture was critical; the largest number of plants being produced by ovaries from flowers at the trinucleate stage of pollen.
Collapse
Affiliation(s)
- A M Castillo
- Estación Experimental de Aula Dei, Ap. 202, Zaragoza, Spain
| | | |
Collapse
|
35
|
Gutiérrez J, Cutando A, Castillo AM, Liébana J, Baca P, Llodra JC. Phagocytosis and adhesiveness of peripheral blood polymorphonuclear leukocytes in patients with rapidly progressive periodontitis. J Oral Pathol Med 1991; 20:493-5. [PMID: 1661332 DOI: 10.1111/j.1600-0714.1991.tb00411.x] [Citation(s) in RCA: 4] [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: 12/28/2022]
Abstract
Phagocytosis and adhesiveness of peripheral blood polymorphonuclear leukocytes were studied in patients diagnosed with generalized rapidly progressive (form A) periodontitis. All patients belonged to a single family and were first degree relatives. In the patients' leukocytes there was a statistically significant reduction in phagocytic index and adhesiveness, in comparison with leukocytes from controls. However, adhesiveness approached control values in the presence of autologous serum, thus implying that serologic factors may enhance this function in patients with this type of periodontitis.
Collapse
Affiliation(s)
- J Gutiérrez
- Department of Microbiology, University of Granada, Spain
| | | | | | | | | | | |
Collapse
|
36
|
Martín MA, Castillo AM, Liebana J, Mesa P, Piedrola G, Gutierrez J. Increase in the activity of third-generation cephalosporins in combination with clavulanic acid and Sulbactam against Bacteroides fragilis. Med Lab Sci 1990; 47:163-7. [PMID: 2402195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
We studied the sensitivity of 160 strains of Bacteroides fragilis (74 beta-lactamase-positive and 86 beta-lactamase-negative) to four third-generation cephalosporins, alone as well as in combination with clavulanic acid and Sulbactam. For susceptibility testing we used a dilution method in agar. Detection of beta-lactamase production by this micro-organism was performed using chromogenic cephalosporin (Nitrocefin). There was a substantial improvement in cephalosporin activity with both positive and negative strains when they were combined with the inhibitors, although this was more significant in beta-lactamase-producing organisms. Generally, the results achieved in combination with clavulanic acid were better than those with Sulbactam, the highest increase in activity being obtained with Ceftizoxime in combination with any one of the inhibitors.
Collapse
Affiliation(s)
- M A Martín
- Department of Microbiology, University School of Medicine and Dentistry, Granada, Spain
| | | | | | | | | | | |
Collapse
|
37
|
Castillo AM, Fernández-Crehuet M, Ocete MD, Liébana JJ, Cueto A, Maroto MC, Piédrola MG. [Comparative in vitro activity of 4 cephalosporins on Bacteroides fragilis]. Med Clin (Barc) 1986; 86:624-6. [PMID: 3724274] [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: 01/07/2023]
|