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  • 1
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 132 (1987), S. 325-330 
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: To better understand the changes that occur in cytoplasmic actin during cell movement, we studied the effect of inhibitors of cell movement on the molecular conformation of actin and its incorporation into the Triton-insoluble cytoskeleton of human neutrophils. The sulfhydryl reactive compound N-ethylmaleimide caused an increase in cellular F-actin as measured by uptake of the F-actin specific fluorescent probe 7-nitrobenz-2-oxadiazole-phallacidin. However, N-ethylmaleimide reduced the amount of actin associated with the Triton-insoluble cytoskeleton. Dithiobisnitrobenzoic acid, a sulfhydryl reagent that does not cross cell membranes efficiently, did not alter the F-actin content of neutrophils. The effect of N-ethylmaleimide was blocked by the presence of dithiothreitol, a donor of sulfhydryl groups. N-ethylmaleimide did not affect the polymerization of actin in a cell-free system. Cytochalasin B did not alter F-actin content of neutrophils but did decrease actin in cytoskeletons of resting neutrophils. Cytochalasin inhibited the increase in F-actin initiated by the chemoattractant N-formylmethionylleucylphenylalanine. We propose that N-ethylmaleimide blocks the stabilization of G-actin in cytoplasm, interferes with the incorporation of F-actin polymer into the cytoskeleton, and depolymerizes the cytoskeleton. In contrast cytochalasin stabilizes G-actin in the presence of chemotactic peptide. These data suggest that reversible conversion of G-actin to F-actin and incorporation of F-actin into the Triton-insoluble cytoskeleton are important for neutrophil movement.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 159 (1994), S. 365-370 
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Activation of protein kinase C (PKC) causes a rapid and sustained increase in the F-actin of T lymphocytes. Because the phosphatidylinositol pathway and the cytoskeleton play a role in lymphocyte activation, we examined the relationship between signal transduction and the F-actin increase in human blood T cells. Anti-CD3 monoclonal antibodies (mAbs) initiate signals which result in activation of T lymphocytes through the T-cell receptor (TCR), involving the phosphatidylinositol pathway, activation of PKC, and increasing intracellular calcium (Cai2+). The fluorescent probe NBD-phallacidin was used to examine the conformational state of actin following stimulation of T lymphocytes with anti-CD3 mAb. Each of three different murine anti-CD3 mAbs caused rapid increases in lymphocytic F-actin content, which was enhanced by cross-linking with a goat anti-mouse IgG. A maximally effective dose of the mAb Leu 4 caused a rise in cellular F-actin of 1.8-fold at 2 minutes and a three-fold increase in Cai2+. Ionomycin, 100 nM, caused a Cai2+ rise similar in magnitude to that caused by anti-CD3 mAb but had no effect on F-actin content. Inhibitors of PKC, 1(5-isoquinolinylsulfonyl)-2methylpiperazine (H7), sphingosine, and sphinganine lowered the resting cellular F-actin and partially blocked the increase in F-actin caused by either anti-CD3 mAb or ionomycin; however, they had no effect on the rise in Cai2+. Cells leached of Ca2+ with EGTA and ionomycin exhibited no Cai2+ increase in response to anti-CD3 mAb or ionomycin; such cells retained the F-actin increase caused by anti-CD3 mAb. We conclude that stimulation of human T lymphocytes via the TCR causes an early rapid increase in F-actin content. Activation of PKC may play a role but the concomitant Cai2+ increase is neither sufficient nor necessary for the F-actin increase. © 1994 wiley-Liss, Inc.
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  • 3
    Publication Date: 1987-08-01
    Print ISSN: 0021-9541
    Electronic ISSN: 1097-4652
    Topics: Biology , Medicine
    Published by Wiley
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  • 4
    Publication Date: 1994-05-01
    Print ISSN: 0021-9541
    Electronic ISSN: 1097-4652
    Topics: Biology , Medicine
    Published by Wiley
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  • 5
  • 6
    Publication Date: 1985-01-01
    Print ISSN: 0005-2736
    Electronic ISSN: 1879-2642
    Topics: Biology , Chemistry and Pharmacology , Medicine , Physics
    Published by Elsevier
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  • 7
    Publication Date: 2020-11-05
    Description: Background: MF patients (pts) can have significant disease-associated symptoms. Guidelines recommend evaluation of pts' symptom burdens and prognostic risk scores at clinic visits. The myeloproliferative neoplasm symptom assessment form total symptom score (MPN-SAF TSS) is a standardized system that evaluates 10 specific MPN-related symptoms on a scale of 1-10. Furthermore, the dynamic prognostic scoring system plus (DIPSS plus) has been validated as a risk stratification tool for MF pts at any point during the disease course. At our institution, leukemia physicians have created an MF pathway to guide practitioners throughout a large healthcare system with many locations. The pathway recommends MPN-SAF TSS and DIPSS plus risk score with clinic visits occurring every 3-6 months. Unfortunately, the traditional approach to obtaining the MPN-SAF TSS and DIPSS plus score is burdensome for many providers and pts. Moreover, a recent analysis (Verstovsek Ann Hematol 2020) demonstrates that risk prognostication is very often performed incorrectly. We designed a study to streamline workflow by incorporating our specialty pharmacy to assist in the completion of the MPN-SAF TSS and DIPSS plus score via telephone prior to clinic visits. We hypothesized that partnership between our physicians and the specialty pharmacy may benefit pts by increasing adherence to the MF pathway. Methods: This study is conducted in two parts, a retrospective and a prospective phase. A review 12 months prior to start of study was completed to gain historical insight on provider adherence to the MF pathway, with attention to MPN-SAF TSS and DIPSS plus. Then, a prospective study was designed to include new or established MF pts. Pts would be followed for 12 months after start of study. The pilot study was open only at our largest site, home to a subspecialty leukemia clinic where disease-specific physicians practice. For pts who enroll in the prospective study, specialty pharmacists complete both the MPN-SAF TSS and the DIPSS plus score ~3 months via phone prior to clinic visits. Calls for each pt are completed within 10 days of the pt's next visit. If the pharmacist is unable to reach the pt, the physician is notified via EMR message. Completed assessments are documented in the EMR. All enrolled pts are evaluated for MF pathway adherence during the study period. Results: We reviewed system-wide charts for 12 months prior to March 1, 2020 to assess if DIPSS and/or MPN SAF forms were documented for MF patients. 79 MF pts, treated by 32 physicians, were identified. Patients in remission after allogeneic stem cell transplantation were excluded. 36 pts (46%) had the MPN-SAF TSS completed and 53 pts (67%) had DIPSS plus performed at least once in the preceding 12 months. 45 pts, treated by 8 physicians, were followed primarily at the pilot site. 27 pts (60%) had MPN-SAF TSS documented and 38 (84%) had DIPSS Plus performed at least once in the preceding 12 months. The prospective study was initiated on March 1, 2020. As of July 15, 2020, 32 patients have been screened for enrollment by treating physicians. This includes 3 newly diagnosed patients not included in the retrospective analysis. 22 pts have had their initial assessments completed. 2 pts could not be reached, 1 of which died prior to the next clinic visit, 2 pts declined the study, and 6 pts had not yet had clinic visits. Of the 22 pts consented and contacted for the study, 100% had the MPN-SAF TSS and DIPSS Plus score documented with their first visit during the study period. To date 11 pts (of the initial 22) have undergone reevaluation; 100% had the MPN-SAF TSS and DIPSS Plus score documented with their 3-month follow-up visit. Conclusion: Many practicing clinicians perform MPN-SAF TSS and DIPSS plus scores for MF pts. However, there are lapses in the uptake of both. At our institution, the DIPSS plus score is performed more commonly than the MPN-SAF TSS. This early analysis suggests that a telemedicine approach and partnership between specialty pharmacy and physicians can optimize clinical workflow. With the initial success of this pilot, our program is expanding study enrollment to include regional clinics. Due to the COVID19 pandemic, there is now heightened interest in telemedicine practices. Preliminary data from this study suggest that a multidisciplinary approach incorporating telemedicine for MF pts provides an effective approach to measuring patient symptom burdens and assigning prognostic categories. Figure Disclosures Chojecki: Novartis: Other: Investigator Meeting Attendance; Incyte: Research Funding. Shah:Incyte: Speakers Bureau; Pharmacyclics: Speakers Bureau. Knight:Foundation for Financial Planning: Research Funding. Ai:Celgene: Speakers Bureau; Incyte: Speakers Bureau. Avalos:Best Practice-Br Med J: Patents & Royalties: receives royalties from a coauthored article on evaluation of neutropenia; Juno: Membership on an entity's Board of Directors or advisory committees. Copelan:Amgen: Membership on an entity's Board of Directors or advisory committees. Grunwald:Janssen: Research Funding; Genentech/Roche: Research Funding; Abbvie: Consultancy; Daiichi Sankyo: Consultancy; Abbvie: Consultancy; Abbvie: Consultancy; Trovagene: Consultancy; Incyte: Consultancy, Research Funding; Celgene: Consultancy; Incyte: Consultancy, Research Funding; Agios: Consultancy; Janssen: Research Funding; Astellas: Consultancy; Daiichi Sankyo: Consultancy; Trovagene: Consultancy; Premier: Consultancy; Merck: Consultancy; Genentech/Roche: Research Funding; Forma Therapeutics: Research Funding; Agios: Consultancy; Celgene: Consultancy; Celgene: Consultancy; Cardinal Health: Consultancy; Pfizer: Consultancy; Trovagene: Consultancy; Premier: Consultancy; Astellas: Consultancy; Premier: Consultancy; Merck: Research Funding; Astellas: Consultancy; Merck: Consultancy; Genentech/Roche: Research Funding; Daiichi Sankyo: Consultancy; Agios: Consultancy; Amgen: Consultancy; Amgen: Consultancy; Cardinal Health: Consultancy; Merck: Consultancy; Cardinal Health: Consultancy; Pfizer: Consultancy; Amgen: Consultancy; Pfizer: Consultancy; Incyte: Consultancy, Research Funding; Forma Therapeutics: Research Funding; Forma Therapeutics: Research Funding.
    Print ISSN: 0006-4971
    Electronic ISSN: 1528-0020
    Topics: Biology , Medicine
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