LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 10 of total 54

Search options

  1. Article ; Online: Feasibility of virtual Alzheimer's biomarker disclosure: Findings from an observational cohort.

    Erickson, Claire M / Chin, Nathaniel A / Rosario, Hannah L / Peterson, Amanda / Johnson, Sterling C / Clark, Lindsay R

    Alzheimer's & dementia (New York, N. Y.)

    2023  Volume 9, Issue 3, Page(s) e12413

    Abstract: Introduction: Increased availability of Alzheimer's disease (AD) biomarker tests provides older adults with opportunities to seek out and learn results. We evaluated the feasibility of virtually returning AD biomarker results.: Methods: Trained study ...

    Abstract Introduction: Increased availability of Alzheimer's disease (AD) biomarker tests provides older adults with opportunities to seek out and learn results. We evaluated the feasibility of virtually returning AD biomarker results.
    Methods: Trained study clinicians disclosed amyloid positron emission tomography (PET) results and provided dementia risk-reduction counseling via televideo to cognitively unimpaired participants already enrolled in AD research (
    Results: Our study demonstrated acceptable levels of retention (93%), compliance (98%), adherence (98%), clinician competence (97%), education comprehension (quiz scores 14/15), and virtual visit functionality (rating 9.4/10). Depression, anxiety, and suicidality remained low and did not differ by amyloid result.
    Discussion: Virtual return of amyloid PET results to cognitively unimpaired research participants is feasible and does not result in increased psychological symptoms. Technological barriers for some participants highlight the need for flexibility. These findings support the use of televideo in AD biomarker disclosure, although our study sample and design have important limitations for generalizability.
    Language English
    Publishing date 2023-07-29
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2832891-7
    ISSN 2352-8737 ; 2352-8737
    ISSN (online) 2352-8737
    ISSN 2352-8737
    DOI 10.1002/trc2.12413
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  2. Article ; Online: Myeloproliferative neoplasm questionnaire: assessing patient disease knowledge in the modern digital information era.

    Pemmaraju, Naveen / Wilson, Nathaniel R / Clementi Doan, Theresa / Qiao, Wei / Peterson, Susan K / Zoeller, Vicky / Schorr, Andrew / Verstovsek, Srdan

    Leukemia & lymphoma

    2021  Volume 62, Issue 9, Page(s) 2253–2260

    Abstract: There is growing Internet and social media use among patients with rare blood cancers, notably myeloproliferative neoplasms (MPNs). A 38-item online questionnaire was developed to assess patients' ( ...

    Abstract There is growing Internet and social media use among patients with rare blood cancers, notably myeloproliferative neoplasms (MPNs). A 38-item online questionnaire was developed to assess patients' (
    MeSH term(s) Hematologic Neoplasms/diagnosis ; Hematologic Neoplasms/therapy ; Humans ; Myeloproliferative Disorders/diagnosis ; Myeloproliferative Disorders/genetics ; Neoplasms ; Social Media ; Surveys and Questionnaires
    Language English
    Publishing date 2021-03-22
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ZDB-ID 1042374-6
    ISSN 1029-2403 ; 1042-8194
    ISSN (online) 1029-2403
    ISSN 1042-8194
    DOI 10.1080/10428194.2021.1901096
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  3. Article ; Online: Targeting Tumor Microenvironment Akt Signaling Represents a Potential Therapeutic Strategy for Aggressive Thyroid Cancer.

    Mirshahidi, Saied / Yuan, Isabella J / Simental, Alfred / Lee, Steve C / Peterson, Nathaniel R / Andrade Filho, Pedro A / Murry, Thomas / Duerksen-Hughes, Penelope / Yuan, Xiangpeng

    International journal of molecular sciences

    2023  Volume 24, Issue 6

    Abstract: Effects of the tumor microenvironment (TME) stromal cells on progression in thyroid cancer are largely unexplored. Elucidating the effects and underlying mechanisms may facilitate the development of targeting therapy for aggressive cases of this disease. ...

    Abstract Effects of the tumor microenvironment (TME) stromal cells on progression in thyroid cancer are largely unexplored. Elucidating the effects and underlying mechanisms may facilitate the development of targeting therapy for aggressive cases of this disease. In this study, we investigated the impact of TME stromal cells on cancer stem-like cells (CSCs) in patient-relevant contexts where applying in vitro assays and xenograft models uncovered contributions of TME stromal cells to thyroid cancer progression. We found that TME stromal cells can enhance CSC self-renewal and invasiveness mainly via the phosphatidylinositol 3-kinase (PI3K)/protein kinase B (Akt) pathway. The disruption of Akt signaling could diminish the impact of TME stromal cells on CSC aggressiveness in vitro and reduce CSC tumorigenesis and metastasis in xenografts. Notably, disrupting Akt signaling did not cause detectable alterations in tumor histology and gene expression of major stromal components while it produced therapeutic benefits. In addition, using a clinical cohort, we discovered that papillary thyroid carcinomas with lymph node metastasis are more likely to have elevated Akt signaling compared with the ones without metastasis, suggesting the relevance of Akt-targeting. Overall, our results identify PI3K/Akt pathway-engaged contributions of TME stromal cells to thyroid tumor disease progression, illuminating TME Akt signaling as a therapeutic target in aggressive thyroid cancer.
    MeSH term(s) Humans ; Proto-Oncogene Proteins c-akt/metabolism ; Phosphatidylinositol 3-Kinases/metabolism ; Tumor Microenvironment ; Signal Transduction ; Thyroid Neoplasms/pathology ; Phosphatidylinositol 3-Kinase/metabolism ; Cell Line, Tumor
    Chemical Substances Proto-Oncogene Proteins c-akt (EC 2.7.11.1) ; Phosphatidylinositol 3-Kinases (EC 2.7.1.-) ; Phosphatidylinositol 3-Kinase (EC 2.7.1.137)
    Language English
    Publishing date 2023-03-13
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2019364-6
    ISSN 1422-0067 ; 1422-0067 ; 1661-6596
    ISSN (online) 1422-0067
    ISSN 1422-0067 ; 1661-6596
    DOI 10.3390/ijms24065471
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  4. Article ; Online: Deep net detection and onset prediction of electrographic seizure patterns in responsive neurostimulation.

    Peterson, Victoria / Kokkinos, Vasileios / Ferrante, Enzo / Walton, Ashley / Merk, Timon / Hadanny, Amir / Saravanan, Varun / Sisterson, Nathaniel / Zaher, Naoir / Urban, Alexandra / Richardson, R Mark

    Epilepsia

    2023  Volume 64, Issue 8, Page(s) 2056–2069

    Abstract: Objective: Managing the progress of drug-resistant epilepsy patients implanted with the Responsive Neurostimulation (RNS) System requires the manual evaluation of hundreds of hours of intracranial recordings. The generation of these large amounts of ... ...

    Abstract Objective: Managing the progress of drug-resistant epilepsy patients implanted with the Responsive Neurostimulation (RNS) System requires the manual evaluation of hundreds of hours of intracranial recordings. The generation of these large amounts of data and the scarcity of experts' time for evaluation necessitate the development of automatic tools to detect intracranial electroencephalographic (iEEG) seizure patterns (iESPs) with expert-level accuracy. We developed an intelligent system for identifying the presence and onset time of iESPs in iEEG recordings from the RNS device.
    Methods: An iEEG dataset from 24 patients (36 293 recordings) recorded by the RNS System was used for training and evaluating a neural network model (iESPnet). The model was trained to identify the probability of seizure onset at each sample point of the iEEG. The reliability of the net was assessed and compared to baseline methods, including detections made by the device. iESPnet performance was measured using balanced accuracy and the F1 score for iESP detection. The prediction time was assessed via both the error and the mean absolute error. The model was evaluated following a hold-one-out strategy, and then validated in a separate cohort of 26 patients from a different medical center.
    Results: iESPnet detected the presence of an iESP with a mean accuracy value of 90% and an onset time prediction error of approximately 3.4 s. There was no relationship between electrode location and prediction outcome. Model outputs were well calibrated and unbiased by the RNS detections. Validation on a separate cohort further supported iESPnet applicability in real clinical scenarios. Importantly, RNS device detections were found to be less accurate and delayed in nonresponders; therefore, tools to improve the accuracy of seizure detection are critical for increasing therapeutic efficacy.
    Significance: iESPnet is a reliable and accurate tool with the potential to alleviate the time-consuming manual inspection of iESPs and facilitate the evaluation of therapeutic response in RNS-implanted patients.
    MeSH term(s) Humans ; Reproducibility of Results ; Seizures/diagnosis ; Seizures/therapy ; Drug Resistant Epilepsy/diagnosis ; Drug Resistant Epilepsy/therapy ; Electrocorticography
    Language English
    Publishing date 2023-06-09
    Publishing country United States
    Document type Journal Article
    ZDB-ID 216382-2
    ISSN 1528-1167 ; 0013-9580
    ISSN (online) 1528-1167
    ISSN 0013-9580
    DOI 10.1111/epi.17666
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  5. Article ; Online: Building a sustainable free flap program in a resource-limited setting: A 12-year humanitarian effort.

    Prasad, Kavita / Peterson, Nathaniel / Nolen, David / Macharia, Chege / Mannion, Kyle / Rohde, Sarah / Sinard, Robert

    Head & neck

    2024  Volume 46, Issue 5, Page(s) 1051–1055

    Abstract: Background: We present a sustainable complex reconstructive program built through 12 years of surgical outreach work at Kijabe Hospital in Kenya.: Methods: Retrospective chart review and anecdotal experiences.: Results: In 2011, surgeons from a US- ...

    Abstract Background: We present a sustainable complex reconstructive program built through 12 years of surgical outreach work at Kijabe Hospital in Kenya.
    Methods: Retrospective chart review and anecdotal experiences.
    Results: In 2011, surgeons from a US-medical center performed Kijabe Hospital's first 3 successful free flap surgeries. Since then, they have returned 7 times, performing a total of 31 tumor excisions with microvascular reconstruction. One flap failure occurred that was reconstructed on a subsequent trip. In 2013, a US-trained missionary surgeon and a Kenyan-trained general surgeon began working with the visiting team with the goal of performing these surgeries independently. In 2016 they performed their first independent free flap reconstruction and have since performed 32 independent cases with only three flap losses. Establishing infrastructure, staff education, selective patient criteria, and continuous communication are the factors that enabled the success of this program.
    Conclusions: Establishing a successful microvascular reconstruction program in a resource-limited setting is feasible.
    MeSH term(s) Humans ; Free Tissue Flaps/blood supply ; Retrospective Studies ; Altruism ; Kenya ; Plastic Surgery Procedures ; Postoperative Complications ; Head and Neck Neoplasms
    Language English
    Publishing date 2024-01-17
    Publishing country United States
    Document type Journal Article
    ZDB-ID 645165-2
    ISSN 1097-0347 ; 0148-6403 ; 1043-3074
    ISSN (online) 1097-0347
    ISSN 0148-6403 ; 1043-3074
    DOI 10.1002/hed.27640
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  6. Article ; Online: The gut virome is associated with stress-induced changes in behaviour and immune responses in mice.

    Ritz, Nathaniel L / Draper, Lorraine A / Bastiaanssen, Thomaz F S / Turkington, Christopher J R / Peterson, Veronica L / van de Wouw, Marcel / Vlckova, Klara / Fülling, Christine / Guzzetta, Katherine E / Burokas, Aurelijus / Harris, Hugh / Dalmasso, Marion / Crispie, Fiona / Cotter, Paul D / Shkoporov, Andrey N / Moloney, Gerard M / Dinan, Timothy G / Hill, Colin / Cryan, John F

    Nature microbiology

    2024  Volume 9, Issue 2, Page(s) 359–376

    Abstract: The microbiota-gut-brain axis has been shown to play an important role in the stress response, but previous work has focused primarily on the role of the bacteriome. The gut virome constitutes a major portion of the microbiome, with bacteriophages having ...

    Abstract The microbiota-gut-brain axis has been shown to play an important role in the stress response, but previous work has focused primarily on the role of the bacteriome. The gut virome constitutes a major portion of the microbiome, with bacteriophages having the potential to remodel bacteriome structure and activity. Here we use a mouse model of chronic social stress, and employ 16S rRNA and whole metagenomic sequencing on faecal pellets to determine how the virome is modulated by and contributes to the effects of stress. We found that chronic stress led to behavioural, immune and bacteriome alterations in mice that were associated with changes in the bacteriophage class Caudoviricetes and unassigned viral taxa. To determine whether these changes were causally related to stress-associated behavioural or physiological outcomes, we conducted a faecal virome transplant from mice before stress and autochthonously transferred it to mice undergoing chronic social stress. The transfer of the faecal virome protected against stress-associated behaviour sequelae and restored stress-induced changes in select circulating immune cell populations, cytokine release, bacteriome alterations and gene expression in the amygdala. These data provide evidence that the virome plays a role in the modulation of the microbiota-gut-brain axis during stress, indicating that these viral populations should be considered when designing future microbiome-directed therapies.
    MeSH term(s) Animals ; Mice ; Virome ; RNA, Ribosomal, 16S/genetics ; Viruses/genetics ; Microbiota ; Bacteriophages/genetics ; Immunity
    Chemical Substances RNA, Ribosomal, 16S
    Language English
    Publishing date 2024-02-05
    Publishing country England
    Document type Journal Article
    ISSN 2058-5276
    ISSN (online) 2058-5276
    DOI 10.1038/s41564-023-01564-y
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  7. Article ; Online: Targeting Tumor Microenvironment Akt Signaling Represents a Potential Therapeutic Strategy for Aggressive Thyroid Cancer

    Saied Mirshahidi / Isabella J. Yuan / Alfred Simental / Steve C. Lee / Nathaniel R. Peterson / Pedro A. Andrade Filho / Thomas Murry / Penelope Duerksen-Hughes / Xiangpeng Yuan

    International Journal of Molecular Sciences, Vol 24, Iss 5471, p

    2023  Volume 5471

    Abstract: Effects of the tumor microenvironment (TME) stromal cells on progression in thyroid cancer are largely unexplored. Elucidating the effects and underlying mechanisms may facilitate the development of targeting therapy for aggressive cases of this disease. ...

    Abstract Effects of the tumor microenvironment (TME) stromal cells on progression in thyroid cancer are largely unexplored. Elucidating the effects and underlying mechanisms may facilitate the development of targeting therapy for aggressive cases of this disease. In this study, we investigated the impact of TME stromal cells on cancer stem-like cells (CSCs) in patient-relevant contexts where applying in vitro assays and xenograft models uncovered contributions of TME stromal cells to thyroid cancer progression. We found that TME stromal cells can enhance CSC self-renewal and invasiveness mainly via the phosphatidylinositol 3-kinase (PI3K)/protein kinase B (Akt) pathway. The disruption of Akt signaling could diminish the impact of TME stromal cells on CSC aggressiveness in vitro and reduce CSC tumorigenesis and metastasis in xenografts. Notably, disrupting Akt signaling did not cause detectable alterations in tumor histology and gene expression of major stromal components while it produced therapeutic benefits. In addition, using a clinical cohort, we discovered that papillary thyroid carcinomas with lymph node metastasis are more likely to have elevated Akt signaling compared with the ones without metastasis, suggesting the relevance of Akt-targeting. Overall, our results identify PI3K/Akt pathway-engaged contributions of TME stromal cells to thyroid tumor disease progression, illuminating TME Akt signaling as a therapeutic target in aggressive thyroid cancer.
    Keywords Akt signaling ; cancer stem cell ; thyroid cancer ; tumor stromal cell ; targeting aggressive disease ; Biology (General) ; QH301-705.5 ; Chemistry ; QD1-999
    Subject code 610
    Language English
    Publishing date 2023-03-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  8. Article ; Online: Contribution of hearing aids to music perception by cochlear implant users.

    Peterson, Nathaniel / Bergeson, Tonya R

    Cochlear implants international

    2015  Volume 16 Suppl 3, Page(s) S71–8

    Abstract: Objectives: Modern cochlear implant (CI) encoding strategies represent the temporal envelope of sounds well but provide limited spectral information. This deficit in spectral information has been implicated as a contributing factor to difficulty with ... ...

    Abstract Objectives: Modern cochlear implant (CI) encoding strategies represent the temporal envelope of sounds well but provide limited spectral information. This deficit in spectral information has been implicated as a contributing factor to difficulty with speech perception in noisy conditions, discriminating between talkers and melody recognition. One way to supplement spectral information for CI users is by fitting a hearing aid (HA) to the non-implanted ear.
    Methods: In this study 14 postlingually deaf adults (half with a unilateral CI and the other half with a CI and an HA (CI + HA)) were tested on measures of music perception and familiar melody recognition.
    Results: CI + HA listeners performed significantly better than CI-only listeners on all pitch-based music perception tasks. The CI + HA group did not perform significantly better than the CI-only group in the two tasks that relied on duration cues. Recognition of familiar melodies was significantly enhanced for the group wearing an HA in addition to their CI. This advantage in melody recognition was increased when melodic sequences were presented with the addition of harmony.
    Conclusion: These results show that, for CI recipients with aidable hearing in the non-implanted ear, using a HA in addition to their implant improves perception of musical pitch and recognition of real-world melodies.
    MeSH term(s) Aged ; Auditory Perception ; Cochlear Implantation/methods ; Cochlear Implantation/rehabilitation ; Cochlear Implants ; Combined Modality Therapy/methods ; Correction of Hearing Impairment/instrumentation ; Correction of Hearing Impairment/methods ; Deafness/psychology ; Deafness/rehabilitation ; Deafness/surgery ; Female ; Hearing Aids ; Humans ; Male ; Middle Aged ; Music/psychology ; Noise
    Language English
    Publishing date 2015-09
    Publishing country England
    Document type Journal Article ; Research Support, N.I.H., Extramural
    ZDB-ID 2079515-4
    ISSN 1754-7628 ; 1467-0100
    ISSN (online) 1754-7628
    ISSN 1467-0100
    DOI 10.1179/1467010015Z.000000000268
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  9. Book ; Online: Tropospheric bromine monoxide vertical profiles retrieved across the Alaskan Arctic in springtime

    Brockway, Nathaniel / Peterson, Peter K. / Bigge, Katja / Hajny, Kristian D. / Shepson, Paul B. / Pratt, Kerri A. / Fuentes, Jose D. / Starn, Tim / Kaeser, Robert / Stirm, Brian H. / Simpson, William R.

    eISSN: 1680-7324

    2024  

    Abstract: Reactive halogen chemistry in the springtime Arctic causes ozone depletion events and alters the rate of pollution processing. There are still many uncertainties regarding this chemistry, including the multiphase recycling of halogens and how sea ice ... ...

    Abstract Reactive halogen chemistry in the springtime Arctic causes ozone depletion events and alters the rate of pollution processing. There are still many uncertainties regarding this chemistry, including the multiphase recycling of halogens and how sea ice impacts the source strength of reactive bromine. Adding to these uncertainties are the impacts of a rapidly warming Arctic. We present observations from the CHACHA (CHemistry in the Arctic: Clouds, Halogens, and Aerosols) field campaign based out of Utqiaġvik, Alaska, from mid-February to mid-April of 2022 to provide information on the vertical distribution of bromine monoxide (BrO), which is a tracer for reactive bromine chemistry. Data were gathered using the Heidelberg Airborne Imaging DOAS (differential optical absorption spectroscopy) Instrument (HAIDI) on the Purdue University Airborne Laboratory for Atmospheric Research (ALAR) and employing a unique sampling technique of vertically profiling the lower atmosphere with the aircraft via “porpoising” maneuvers. Observations from HAIDI were coupled to radiative transfer model calculations to retrieve mixing ratio profiles throughout the lower atmosphere (below 1000 m), with unprecedented vertical resolution (50 m) and total information gathered (average of 17.5 degrees of freedom) for this region. A cluster analysis was used to categorize 245 retrieved BrO mixing ratio vertical profiles into four common profile shapes. We often found the highest BrO mixing ratios at the Earth's surface with a mean of nearly 30 pmol mol −1 in the lowest 50 m, indicating an important role for multiphase chemistry on the snowpack in reactive bromine production. Most lofted-BrO profiles corresponded with an aerosol profile that peaked at the same altitude (225 m above the ground), suggesting that BrO was maintained due to heterogeneous reactions on particle surfaces aloft during these profiles. A majority (11 of 15) of the identified lofted-BrO profiles occurred on a single day, 19 March 2022, over an area covering more than 24 000 km ...
    Subject code 551
    Language English
    Publishing date 2024-01-03
    Publishing country de
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  10. Article ; Online: Local Intraluminal Irrigation With Argatroban During Free Flap Repair in a Patient With Heparin-Induced Thrombocytopenia.

    Macias, David / Kwon, Daniel I / Walker, Paul C / Peterson, Nathaniel R

    The Annals of otology, rhinology, and laryngology

    2017  Volume 126, Issue 5, Page(s) 407–410

    Abstract: Objective: This study describes a case of a successful free flap repair using argatroban for local intraluminal irrigation as a substitute to heparin in a patient with heparin-induced thrombocytopenia.: Methods: Case report and review of literature.!# ...

    Abstract Objective: This study describes a case of a successful free flap repair using argatroban for local intraluminal irrigation as a substitute to heparin in a patient with heparin-induced thrombocytopenia.
    Methods: Case report and review of literature.
    Results: The patient had an uneventful postoperative course, and the free flap survived without complications.
    Conclusions: The use of argatroban during microvascular surgery is likely to be safe and simple and may be effective in preventing micro-thrombotic complications during microvascular surgery, and it should be considered as an alternative to heparinized saline for local intraluminal irrigation.
    MeSH term(s) Carcinoma, Squamous Cell/pathology ; Carcinoma, Squamous Cell/surgery ; Female ; Forearm/surgery ; Free Tissue Flaps/blood supply ; Head and Neck Neoplasms/pathology ; Head and Neck Neoplasms/surgery ; Humans ; Middle Aged ; Mouth Neoplasms/pathology ; Mouth Neoplasms/surgery ; Neck Dissection/methods ; Pipecolic Acids/administration & dosage ; Platelet Aggregation Inhibitors/administration & dosage ; Radial Artery/surgery ; Treatment Outcome
    Chemical Substances Pipecolic Acids ; Platelet Aggregation Inhibitors ; argatroban (IY90U61Z3S)
    Language English
    Publishing date 2017-05
    Publishing country United States
    Document type Case Reports ; Journal Article
    ZDB-ID 120642-4
    ISSN 1943-572X ; 0003-4894
    ISSN (online) 1943-572X
    ISSN 0003-4894
    DOI 10.1177/0003489417693015
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

To top