6 research outputs found

    A better model for membrane study: Mapping the effects of SOPC in a quaternary phase diagram

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    Honors Chemistry ThesisIn my study, I attempt to create a unique and more biologically relevant model of the cholesterol-rich exoplasmic leaflet of animal plasma membranes. Using electroswelling to create giant unilamellar vesicles, fluorescence microscopy, and the previously completed ternary mixture of DOPC, DSPC, and cholesterol, DOPC, a rare biological lipid, was gradually replaced with SOPC, an abundant biological lipid in order to create a partially completed quaternary phase diagram consisting of DOPC, SOPC, DSPC, and cholesterol. Focusing on the biological raft region, (Lo+Lα coexistence phase), reduction in the size of the coexistence region was found, thus verifying the notion that SOPC is more miscible with DSPC and cholesterol than is DOPC. DOPC replacements greater than 70% resulted in a disappearance of the coexistence region leading to a suspicion that the phase domains were too small to observe using optical fluorescence microscopy. The creation of a more biological model membrane can be used to further understand the role of lipids and proteins in cellular membranes as well as the size of biological rafts important in cellular function

    Recurrent heart failure with preserved ejection fraction associated with carfilzomib administration for multiple myeloma

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    Abstract Carfilzomib, an epoxyketone proteasome inhibitor, has demonstrated improved progression-free survival in patients when used with standard treatment (lenalidomide and dexamethasone) in patients with relapsed multiple myeloma (MM). However, there are reports of adverse cardiac events with carfilzomib manifested by dyspnea and heart failure. A patient is presented who had recurrent, clinically mild cardiotoxicity, as manifested by recurrent heart failure with preserved ejection fraction, with ongoing maintenance carfilzomib in a patient with resistant MM is presented
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