Since biofilms are ubiquitous in several settings and act as sources of illness for people, dependable strategies to characterize and quantify these microbial communities are required. Quite a few strategies have been employed, however most of them are unidirectional, labor intensive and time consuming.
Though stream cytometry (FCM) is usually a dependable option to shortly present a multiparametric evaluation, there are nonetheless few purposes on biofilms, and even much less on the research of inter-kingdom communities. This work aimed to present insights into the applying of FCM so as to extra comprehensively analyze mixed-species biofilms, fashioned by completely different Pseudomonas aeruginosa and Candida albicans strains, earlier than and after publicity to antimicrobials.
For comparability functions, biofilm culturability was additionally assessed figuring out colony-forming items. The outcomes confirmed that some points, specifically the microbial pressure used, the morphological state of the cells and the biofilm matrix, make the correct evaluation of FCM information troublesome. These points have been much more difficult when double-species biofilms have been being inspected, as they may engender information misinterpretations. The outcomes draw our consideration in direction of the necessity to all the time consider the traits of the biofilm samples to be analyzed via FCM, and undoubtedly hyperlink to the necessity for optimization of the processes tailor-made for every specific case research.
Monocyte HLA-DR measurement by stream cytometry in COVID-19 sufferers: an interim evaluation
A number of months after the sudden emergence of SARS-CoV-2 and COVID-19, the understanding of the suitable host immune response to a virus completely unknown of human immune surveillance remains to be of main significance. By worldwide definition, COVID-19 falls within the scope of septic syndromes (organ dysfunction because of dysregulated host response to an an infection) during which immunosuppression is a major driver of mortality.
Sepsis-induced immunosuppression is generally outlined and monitored by the measurement of decreased expression of HLA-DR molecules on circulating monocytes (mHLA-DR). On this interim evaluation, we summarise the primary mHLA-DR ends in COVID-19 sufferers. In critically sick sufferers, outcomes homogenously point out a decreased mHLA-DR expression, which, together with profound lymphopenia and different practical alterations, is indicative of a standing of immunosuppression.
Diameters and Fluorescence Calibration for Extracellular Vesicle Analyses by Stream Cytometry’
Extracellular vesicles (EVs) play an important position within the intercellular crosstalk. Mesenchymal stem cell-derived EVs (MSC-EVs), displaying promising therapeutic roles, contribute to the robust rationale for growing EVs in its place therapeutic possibility. EV evaluation nonetheless represents one of many main points to be solved so as to translate using MSC-EV detection in scientific settings. Even when stream cytometry (FC) has been largely utilized for EV research, the dearth of consensus on protocols for FC detection of EVs generated controversy.
Commonplace FC procedures, based mostly on scatter measurements, solely permits the detection of the “tip of the iceberg” of all EVs. We utilized another FC strategy based mostly on using a set off threshold on a fluorescence channel. The EV numbers obtained by the applying of the fluorescence triggering resulted considerably larger in respect to them obtained from the identical samples acquired by inserting the brink on the facet scatter (SSC) channel.
The evaluation of EV concentrations carried out by three completely different standardized stream cytometers allowed us to realize a excessive degree of reproducibility (CV < 20%). By making use of the here-reported technique extremely reproducible outcomes when it comes to EV evaluation and focus measurements have been obtained.
Predicting single-cell gene expression profiles of imaging stream cytometry information with machine studying
Excessive-content imaging and single-cell genomics are two of essentially the most distinguished high-throughput applied sciences for learning mobile properties and features at scale. Current research have demonstrated that info in massive imaging datasets can be utilized to estimate gene mutations and to foretell the cell-cycle state and the mobile determination making straight from mobile morphology. Thus, high-throughput imaging methodologies, resembling imaging stream cytometry can probably intention past easy sorting of cell-populations.
We introduce IFC-seq, a machine studying methodology for predicting the expression profile of each cell in an imaging stream cytometry experiment. Since it’s to-date unfeasible to watch single-cell gene expression and morphology in stream, we combine uncoupled imaging information with an impartial transcriptomics dataset by leveraging widespread floor markers.
We show that IFC-seq efficiently fashions gene expression of a average variety of key gene-markers for 2 impartial imaging stream cytometry datasets: (i) human blood mononuclear cells and (ii) mouse myeloid progenitor cells. Within the case of mouse myeloid progenitor cells IFC-seq can predict gene expression straight from brightfield photos in a label-free method, utilizing a convolutional neural community. The proposed technique guarantees so as to add gene expression info to present and new imaging stream cytometry datasets, at no extra price.
Manufacturing of interspecies somatic/pluripotent heterokaryons utilizing polyethylene glycol (PEG) and choice by imaging stream cytometry for the research of nuclear reprogramming
Fusion of somatic cells to embryonic stem cells induces reprogramming of the somatic nucleus and can be utilized to check the impact of trans-acting components from the pluripotent cell over the differentiated nucleus. Nonetheless, fusion solely happens in a small fraction of the cells uncovered to fusogenic circumstances, therefore the necessity for a protocol that produces excessive fusion fee with minimal cell injury, coupled with a way able to figuring out and choosing these uncommon occasions.
Right here, we describe a protocol to induce formation of bi-species mouse pluripotent/bovine somatic heterokaryons, in addition to same-species homokaryons, utilizing polyethylene glycol (PEG). To establish bi-species fusion merchandise, heterokaryons have been labeled utilizing cell type-specific fluorescent antibodies and chosen utilizing imaging (Amnis ImageStream Mark II) and conventional (BD FACSAria I) stream cytometry.
Heterokaryons chosen with this technique produced ES cell-like colonies in vitro. This process will be mixed with downstream purposes resembling nucleic acid isolation for RT-PCR and RNA-Seq, and used as a instrument to check somatic cell nuclear reprogramming.