I and a colleague have attempted to use this on two different types
of cell lines using Flow cytometry and fluorescence microscopy all of which proved unsuccessful.
As names are not even used consistently in publications and deviations from the original name are not rare, the situation increasingly causes confusion about the identity
of cell lines used in specific studies.
Approximately 20 - 30 %
of all cell lines used in biomedical research are contaminated.
Not exact matches
The majority
of study participants reported that it's all good, fine and kosher with them (well, technically «generally OK») to
use a
cell phone when walking down the street, riding public transit and waiting in
line.
Phone surveys
used to be the standard in the industry back when all customers had land
lines, but in the era
of the
cell phone and do - not - call list, it's less reliable.
Memphis Meats acknowledges it
used FBS to start its
cell lines but says, «We have validated a production method that does not require the
use of any serum, and we are developing additional methods as we speak.»
In August
of last year, President Bush approved the
use of federal funds to support research on a limited number
of existing human embryonic stem
cell lines.
Where is the clear
line in a progression from (1)
using animal insulin to treat diabetes, to (2)
using gene remodeling techniques to grow insulin in a host bacterium that will reproduce rapidly and from which a plentiful supply
of insulin can be harvested, to (3) genetic surgery to replace the defective gene in a person diagnosed as diabetic, to (4) genetic surgery immediately after fertilization in order to replace the defective gene and alter the germ
cells which would otherwise have transmitted the disease to one's offspring?
The second part
of the automation job was the complete process data acquisition for the filling process
cells that cover the data processing for seven filling
lines, with approximately 150 associated controllers
used to cyclically read 21,000 digital and 2,000 analogue data points.
Our bodies then
use these essential nutrients to rebuild
cells and particularly the
lining of our intestine — which prevents those food sensitivities that seem to be on the rise these days.
Before we established in - house human taste
cell (HTC) technologies, it was not possible to
use human tongue - derived
cells as a model, due to the lack
of homogenous, proliferating
cell lines with defined properties, which is a prerequisite to establish comprehensive research and screening programs.
As well as allowing the
use of stem
cells grown from established
cell lines, the technology could enable the creation
of improved human tissue models for drug testing and potentially even purpose - built replacement organs.
Using an experimental FA
cell line, they also found that
cells without frataxin produced lower levels
of ApoA - I compared to controls.
To solve this, West proposed «therapeutic cloning» — taking the nucleus out
of a patient's
cell, transferring it into an egg
cell to create a cloned embryo, then
using that embryo to derive patient - matched stem -
cell lines.
One perplexing problem, however, is that three out
of 13
of the iPS
cell lines created by Hochedlinger's team had a complete extra set
of chromosomes, which has not been seen with iPS
cells made
using retroviruses.
Each
of the four compounds was then tested in the lab to see how it would affect a
line of prostate cancer
cells relatively sensitive to the chemotherapeutic Paclitaxel, commonly
used to treat prostate cancer patients.
In these instances, the committee says, the
use of existing embryonic
cell lines derived from embryos fewer than 14 days old should be considered before resorting to the
use of cells taken from surplus in vitro fertilization embryos fewer than 14 days old.
In addition, where
cells derived from embryonic stem
cells are great at proliferating — a potentially critical feature if one wants to grow sufficient numbers
of cells for clinical
use — ones from the iPS
lines were much feebler.
Figure on the left: Analyzing the relative sensitivity
of hundreds
of cancer
cell lines to commonly
used anti-cancer drugs (each dot) reveals that
cells with suppressed expression
of one proteasome cap subunit are specifically resistant to treatments with the proteasome inhibitors MG132 and bortezomib.
Doing this in bacteria or
cell lines used for growing chemicals would be
of huge importance to industry, where viral infections can shut down entire production
lines.
And early stage startup Neochromosome, which includes Boeke, intends to raise money to design synthetic chromosomes for medicine that could be
used in an off - the - shelf universal
cell line in
cell therapies and transplants with minimal risk
of rejection from the immune system.
The enzyme was tested in three different
cell lineages: leukemia
cells incapable
of producing asparagine at normal levels (MOLT4); another
line of leukemia
cells, in this case capable
of producing asparagine at normal levels (REH); and non-malignant
cells,
used as a control (HUVECs).
Hamilton announced the newest organ - on - chip innovation, which recreates an intestinal
lining using patient - derived stem
cells, created through a partnership between Emulate and Cedars - Sinai Board
of Governors Regenerative Medicine Institute.
The team also analyzed the effects
of IL - 10 on epithelial wound closure in vitro
using an intestinal epithelial
cell line.
A stem
cell core facility at CHOP, directed by study co-author Deborah French under the auspices
of the hospital's Center for Cellular and Molecular Therapeutics, generated the iPSCs
lines used in these studies.
Using both fruit fly and human lung cancer
cell lines, researchers targeted two
of the most common genetic mutations associated with NSCLC — Ras and PTEN (P13K).
His team plans to introduce a healthy copy
of the CF gene into
cells lining the nose and lungs,
using a lipid suspension that fuses with the
cell membrane and allows the gene to enter the
cell.
To see whether cancer stem
cell renewal involves a chain
of events similar to that
used by embryonic stem
cells, and whether the process was affected by oxygen levels, Semenza and graduate student Chuanzhao Zhang focused their studies on two human breast cancer
cell lines that responded to low oxygen by ramping up production
of the protein ALKBH5, which removes methyl groups from mRNAs.
The laboratory process, described in the journal Scientific Reports, entails genetically modifying a
line of human embryonic stem
cells to become fluorescent upon their differentiation to retinal ganglion
cells, and then
using that
cell line for development
of new differentiation methods and characterization
of the resulting
cells.
While American stem
cell researchers were celebrating the final NIH stem
cell guidelines, questions remain, particularly whether the National Institutes
of Health will approve existing
lines in time for
use with stimulus funds.
The team
used five types
of antibiotics — including one
used to treat acne (doxycycline)-- on
cell lines of eight different types
of tumour and found that four
of them eradicated the cancer stem
cells in every test.
Stem
cell advocates have been expressing serious worry that ethical requirements spelled out in the draft guidelines — in particular, informed consent procedures for embryo donors — will rule out the
use of many existing human embryonic stem
cell lines, including the 21
lines approved under the Bush Administration.
The final guidelines on research with human embryonic stem
cells issued on Monday by the National Institutes
of Health set out criteria for determining which ES
cell lines can be
used in federally funded experiments and give NIH discretion to approve old
lines that don't meet stringent modern ethical requirements.
Last January, the House
of Representatives voted, 253 to 174, to pass a bill, H.R. 3, that would allow researchers to
use leftover embryos from in vitro fertilization (IVF) clinics to create new
lines of embryonic stem
cells, and in April, the Senate passed its version
of the bill.
Using nanoparticles designed and screened for endothelial delivery
of short strands
of RNA called siRNA, the researchers were able to target RNAi to endothelial
cells, which form the
linings of most organs.
They have since learned that as many as 40
of those
lines may never be fully developed; some may even have been contaminated by mouse
cells used to sustain them in the lab.
Mindful
of public sensitivities, Daley opted to pursue experiments
using what he considers the least controversial human materials to create new nonpresidential stem
cell lines — poor quality embryos and oocytes that, in his words, «otherwise would have been disposed
of as medical waste.»
Using a powerful imaging technique that allowed the scientists to track the presence and movement
of parasites in living tissues, the researchers found that Toxoplasma infects the brain's endothelial
cells, which
line blood vessels, reproduces inside
of them, and then moves on to invade the central nervous system.
A team
of researchers in Germany and Denmark led by Steven Johnsen, Professor at the University Medical Center Göttingen, Germany,
used human prostate cancer
cell lines and depleted them
of the DNA - binding protein CHD1.
Cheng, an assistant professor
of medicine in hematology / oncology at Feinberg, provided the
cell lines and NanoFlare targets the researchers
used to model blood samples taken from breast cancer patients.
One
of the most popular models is the immunodeficient nonobese diabetic severe combined immunodeficiency (NOD scid) gamma (NSG) transgenic mouse
line, which can be endowed with a humanized immune system
using CD34 + hematopoietic stem
cells.
The scientists
used the new indexing method on several human
cell lines and from a mouse brain to reveal the methylome
of 3,282 single
cells.
Henrietta Lacks famously (and unwittingly) established the HeLa
cell line, one
of the most widely
used lines in cancer research.
Researchers have already developed dozens
of patient - specific
cell lines using this new method.
They
used the gene editing technology CRISPR to engineer a series
of human embryonic stem
cell lines, which were identical apart from the number
of DNA repeats that occurred at the ends
of their HTT genes.
To address these questions, Dang, Altman, and Hsieh collaborated with Penn colleague, Aalim Weljie, PhD, research assistant professor
of Pharmacology,
using an osteosarcoma cancer
cell line to study the interaction
of MYC and metabolism in cancer
cells.
The team
used light and electron microscopy to show that lymphatic endothelial
cells, which
line the interior surface
of the lymph node capsule, contain a number
of channels that penetrate the whole thickness
of the
cells.
Derived mostly from human embryonic kidney 293T (HEK293T) and HeLa
cell lines, EdiGene Knockout (KO) Cell Lysates have been optimized through the use of genome editing technology and validated at the genomic level through PCR and Sanger - sequencing techniques to ensure the accuracy and knockout of the target g
cell lines, EdiGene Knockout (KO)
Cell Lysates have been optimized through the use of genome editing technology and validated at the genomic level through PCR and Sanger - sequencing techniques to ensure the accuracy and knockout of the target g
Cell Lysates have been optimized through the
use of genome editing technology and validated at the genomic level through PCR and Sanger - sequencing techniques to ensure the accuracy and knockout
of the target gene.
Earlier approaches to creating this growth environment, pioneered by study co-author Jason Spence, Associate Professor
of Internal Medicine at the University
of Michigan, had
used a natural matrix derived from a tumor
cell line.
A new technique
of direct binding
of radioactive DNA was
used to screen a complementary DNA expression library from the BJAB
cell line in lambda gt11 phage to derive molecular cDNA clones representing a putative B lymphocyte - specific octamer binding protein.