Cell-free Supernatant
Cell-free Supernatant - Related Videos
01:49
An Assay To Evaluate the Anticancer Effects of Lactobacillus Cell-Free Supernatant
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2025
This video demonstrates an in vitro assay to study the anticancer effects of Lactobacillus cell-free supernatant (LCFS). Upon exposing colorectal cancer spheroids to varying doses of LCFS, the interaction with the bacterial metabolites in LCFS induces apoptosis in the cancer cells, disrupting the spheroid structure and leading to cell death in a dose-dependent manner.
06:07
Evaluating Cell Death Using Cell-Free Supernatant of Probiotics in Three-Dimensional Spheroid Cultures of Colorectal Cancer Cells
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Cited by 15 •
2020
Here methods are presented to understand anti-cancer effects of Lactobacillus cell-free supernatant (LCFS). Colorectal cancer cell lines show cell deaths when treated with LCFS in 3D cultures. The process of generating spheroids can be optimized depending on the scaffold and the analysis methods presented are useful for evaluating the involved signaling pathways.
03:40
Heparin Affinity Chromatography-Based Baculovirus Purification: A Technique to Isolate Baculovirus From Insect Cell Supernatant
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2025
In this video, we demonstrate the technique to isolate baculovirus from an insect cell supernatant using heparin affinity chromatography. The isolation is facilitated by the affinity between the heparin in the column to the baculovirus envelope glycoprotein.
08:36
Measuring Dengue Virus RNA in the Culture Supernatant of Infected Cells by Real-time Quantitative Polymerase Chain Reaction
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Cited by 7 •
2018
Real-time quantitative polymerase chain reaction analysis combined with reverse transcription (RT-qPCR) has been widely used to measure the level of RNA virus infections. Here we present a direct RT-qPCR assay, which does not require an RNA purification step, developed for the quantification of several RNA viruses, including dengue virus.
12:16
Patient Derived Cell Culture and Isolation of CD133+ Putative Cancer Stem Cells from Melanoma
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Cited by 22 •
2013
This article describes the preparation of freshly obtained melanoma tissue into primary cell cultures, and how to remove contaminations of erythrocytes and fibroblasts from the tumor cells. Finally, we describe how CD133+ putative melanoma stem cells are sorted from the CD133- bulk using Magnetic Activated Cell Sorting (MACS).
FAQs
The clarification conditions largely determine its molecular profile. Centrifugation removes cells and larger debris, while filtration adds a pore-size-based separation step. Depending on those choices, the resulting liquid may retain soluble proteins, metabolites, nucleic acids, and extracellular vesicles in different proportions. Consequently, the same biological sample can yield different analytical fractions under different processing conditions.
Clarification is not merely a cleanup step; it shapes the material being measured. Centrifugation, filtration, or their combination can remove different physical fractions, changing which released molecules remain available for analysis. Researchers therefore need to relate findings to the processing conditions used, because the observed composition reflects both biological release and the selected clarification procedure.
Molecules released into the surrounding environment can provide evidence of secreted factors and paracrine communication, meaning signaling between nearby cells or biological populations. Analyzing this liquid fraction allows researchers to examine extracellular products without focusing only on the cells themselves. This perspective can help connect cellular activity with effects occurring elsewhere in the culture or sample.
A typical workflow begins with a biological culture or sample, followed by removal of cells and larger debris through centrifugation, filtration, or both. The clarified liquid is then collected for downstream analysis or functional testing. Processing and storage should be handled carefully so that the recovered molecular composition remains as representative as possible and experiments remain reproducible.
The choice depends on the fraction that must be retained and the degree of clarification required. Centrifugation removes cells and larger debris, whereas filtration introduces pore size as an additional selection factor. Combining the methods can provide further clarification, but it may also alter which extracellular components remain. The selected procedure should therefore match the intended molecular or functional analysis.
Researchers can examine secreted factors, paracrine communication, microbial products, and host responses using this material. These analyses may also support biomarker discovery or functional assays, in which the collected liquid is evaluated for biological effects. The approach is useful when the research question concerns substances released from cells or organisms into their surrounding environment rather than cellular components alone.
Careful processing and storage help preserve the molecular composition captured during sample preparation. If handling changes that composition, comparisons between samples or experiments may become less reliable. Standardizing clarification and storage practices therefore supports more consistent analysis of secreted molecules, microbial products, host responses, or biomarker candidates across biological studies.