RNAlater® Tissue Collection: RNA Stabilization Solution
IMPORTANT! Before using this product, read and understand the
“Safety Information” appendix in this document.
■ Product Description
■ Product Information
■ Guidelines for Use of RNAlater® Solution
■ Storage in RNAlater® Solution
■ RNA Isolation from Samples in RNAlater® Solution
■ Quality Control
■ Appendix A Safety Information
■ Documentation and Support
Product Description
RNAlater® Tissue Collection: RNA Stabilization Solution is an
aqueous tissue storage reagent that rapidly permeates most tissues
to stabilize and protect RNA in fresh specimens. It eliminates the
need to immediately process or freeze samples; the specimen can
simply be submerged in RNAlater® Solution and stored for analysis
at a later date.
Samples in RNAlater® Solution can be stored for extended periods
under conditions where RNA degradation would normally take
place rapidly .Tissues can be stored indefinitely in
RNAlater® Solution at –20°C or below.
Product Information Storage and stability
•Store RNAlater® Solution at room temperature.
• If any precipitation of RNAlater® Solution is seen, heat it to
37°C and agitate to redissolve it.
Sample types compatible with RNAlater® Solution
RNAlater® Solution can be used for RNA preservation with most
tissues, cultured cells, bacteria, and yeast. It may not be effective in
tissues that are poorly penetrated by the solution, such as waxy
plant tissue and bone.
RNAlater® Solution has been extensively tested with animal tissues,
including brain, heart, kidney, spleen, liver, testis, skeletal muscle,
fat, lung, and thymus. It has also been proven effective for RNA
preservation in E. coli, Drosophila, tissue culture cells, white blood
cells, and some plant tissues. For more information, go to
www.invitrogen.com/site/us/en/home/support/technical-
support.html.
RNA isolation from RNAlater® Solution
RNAlater® Solution is compatible with most RNA isolation methods.
Samples stored in RNAlater® Solution have been used successfully
with TRI Reagent® Solution (P/N AM9738), and all of Ambion®
RNA isolation kits and reagents, including: the TōTALLY RNA™ Kit,
the PARIS™ Kit, the mirVana™ miRNA Isolation Kit, and the
RNAqueous® and Poly(A)Purist™ product families.
Isolating genomic DNA from RNAlater® Solution-stored
samples
DNA can be isolated from RNAlater® Solution-stored samples. For
more information, go to www.invitrogen.com/site/us/en/home/
support/technical-support.html.
Isolating protein from RNAlater® Solution-stored
samples
Proteins are also preserved in RNAlater® Solution. RNAlater®
Solution will denature proteins; therefore, protein obtained from
samples stored in it will be suitable for applications such as Western
blotting or 2D gel electrophoresis, but not for applications that
require native protein.
Guidelines for Use of RNAlater® Solution
•Use RNAlater® Solution with fresh tissue only; do not freeze
tissues before immersion in RNAlater® Solution.
• Before immersion in RNAlater® Solution, cut large tissue
samples to ≤ 0.5 cm in any single dimension.
• Place the fresh tissue in 5–10 volumes of RNAlater® Solution.
• Most samples in RNAlater® Solution can be stored at room
temperature for 1 week without compromising RNA quality, or
at –20°C or –80°C indefinitely.
• Do not freeze samples in RNAlater® Solution immediately;
store at 4°C overnight (to allow the solution to thoroughly
penetrate the tissue), remove supernatant, then move to –20°C
or –80°C for long-term storage.
Note: We offer RNAlater®-ICE (P/N AM7030) to recover tissues that
have already been frozen. RNAlater®-ICE renders frozen tissues
pliant enough for homogenization while maintaining the low
temperatures needed to protect the RNA from degradation.
Animal Tissue
RNAlater® Solution does not disrupt the structure of tissues; thus,
tissue that has been equilibrated in RNAlater® Solution can be
removed from the solution, sectioned into smaller pieces, and
returned to RNAlater® Solution, if desired.
Small organs such as mouse liver, kidney and spleen can be stored
whole in RNAlater® Solution.
Plant Tissue
Plant tissues that have natural barriers to diffusion, such as waxy
coatings on leaves, will often require disruption to allow RNAlater®
Solution access to the tissue. However, many plant tissues can
simply be submerged in RNAlater® Solution whole; we have
successfully isolated intact RNA from tobacco leaf explants, entire
Arabidopsis and alfalfa seedlings, and from potato shoot tips.
Tissue Culture Cells
Pellet cells according to the protocols followed by your laboratory.
Remove supernatant and then add 5–10 volumes RNAlater®
Solution. The cells can be washed in PBS before resuspending in
RNAlater® Solution, if desired.
Blood and Plasma
White blood cells can be effectively preserved in RNAlater® Solution
when separated from the red blood cells and sera and treated as
tissue culture cells. RNAlater® Solution can also be added to small
volumes of anticoagulated whole blood, sera, and plasma; however,
the procedure is not presented here—see the Ambion RiboPure™-
Blood Kit (P/N AM1928) protocol for detailed instructions.
Yeast
Pellet up to 3 x 108 cells (centrifuge at 12,000 x g for 2 min). Remove
supernatant and immediately resuspend the pellet in 0.5–1 mL of
RNAlater® Solution. Yeast cells can be stored in RNAlater® Solution
for up to 8 hr at 25°C, or up to a week at 4°C.
For long-term storage, incubate the cells in RNAlater® Solution for
1 hr. Repellet the cells (centrifuge at >12,000 x g for 5 min), remove
supernatant, flash freeze, and store at –80°C.
Bacteria
RNAlater® Solution is bacteriostatic; although bacteria do not grow
in it, the cells remain intact. E. coli stored in RNAlater® Solution for
1 month at 4°C are intact and yield undegraded RNA.
Storage in RNAlater® Solution
If refrigeration is available:
Storage at –80°C
Storage at –80°C is recommended for archival samples and will
provide optimal preservation. Samples can be stored at –80°C
indefinitely. RNAlater® Solution will freeze at –80°C.
To prepare samples for storage at –80°C, first incubate the samples
in RNAlater® Solution overnight at 4°C to allow thorough
penetration of the tissue, then transfer to –80°C. To expedite thawing
of the samples, we recommend removing the tissue, or pelleting
cells, from the RNAlater® Solution before freezing at –80°C.
Samples can subsequently be thawed at room temperature and
refrozen without significantly affecting the amount or the integrity
of the recoverable RNA.
Storage at –20°C
Storage at –20°C can also be used for archival samples. Samples will
not freeze at –20°C, but crystals may form; this will not affect
subsequent RNA isolation. Samples can be stored at –20°C
indefinitely.
To prepare samples for storage at –20°C, first incubate the samples
in RNAlater® Solution overnight at 4°C to allow thorough
penetration of the tissue, then transfer to –20°C.
Samples can subsequently be thawed at room temperature and
refrozen without affecting the amount or the integrity of the
recoverable RNA.
Storage at 4°C
Most samples can be stored in RNAlater® Solution at 4°C for up to
1 month without significant RNA degradation.
If refrigeration is not available:
Place samples in the coolest environment available. If ambient
temperature is above 25°C, incubate the samples in RNAlater®
Solution on ice for a few hours, if possible, before storing at ambient
temperature.
Storage at 25°C (room temperature)
Most samples can be stored at 25°C in RNAlater® Solution for up to
1 week without significant loss of RNA quality. After 2 weeks at
25°C, RNA generally appears slightly degraded (marginally
acceptable for Northern analysis, but still of sufficient quality for
nuclease protection assays or RT-PCR analysis).
Storage at 37°C
RNA isolated from samples stored at 37°C is intact after a 24 hour
incubation, but is partially degraded after 3 days.
RNA Isolation from Samples in RNAlater® Solution
Remove RNAlater® Solution from samples
RNase inactivation is reversible; do not rinse RNAlater® Solution
from samples before using. Blot tissues with a wipe, or pellet cells to
remove excess RNAlater® Solution.
Tissue
Retrieve tissue from RNAlater® Solution with sterile forceps, quickly
blot away excess RNAlater® Solution with an absorbent lab wipe or
paper towel, and then submerge the sample in RNA isolation lysis
solution. Homogenize tissue promptly after placing it in lysis/
denaturation solution.
Cells
There are two options for isolating RNA from cells stored in
RNAlater® Solution. The preferred method is to remove the solution
from the cells prior to extraction. Alternatively, cells in RNAlater®
Solution can be used directly for RNA extraction. Because of the
greater volume that the cells are in, this method generally requires
additional lysis solution.
• Removal of RNAlater® Solution prior to extraction
Because of the density of RNAlater® Solution, greater
centrifugal forces are required to pellet cells from RNAlater®
Solution than from normal media. Generally, cells become
much less fragile when stored in RNAlater® Solution and can be
centrifuged at high speed without lysis. Most cell types can be
centrifuged at 5000 x g without damage to the cells. Since
different cell types vary in their ability to withstand centrifugal
forces, we recommend testing the centrifugal speed with an
expendable sample. Alternatively, dilute the RNAlater®
Solution by adding an equal volume of ice cold PBS (or other
buffered solution) immediately before centrifugation to reduce
the density of the solution, then centrifuge at normal speeds.
• RNA extraction from cells in RNAlater® Solution
One-step phenol-based disruption/extraction solutions, such as
Ambion TRI Reagent® Solution or RNAwiz™ Reagent
(available only in Japan), can be used to purify RNA from cells
suspended in RNAlater® Solution. This can be done by adding
ten volumes of the one-step solution to the cell mixture, and
proceeding normally. When RNAwiz Reagent is used in this
way, it may be necessary to dilute the aqueous phase before the
RNA precipitation step. See below for more information.
Tips for RNA isolation
Glass fiber-based extraction
Lysates from RNAlater® Solution-treated samples often require more
force to pass through glass-fiber filters than lysates from untreated
samples. Therefore, it may be necessary to use centrifugation instead
of vacuum pressure to pass lysates through glass-fiber filters.
One-step disruption/extraction solutions
When using one-step RNA isolation products such as TRI Reagent
Solution or RNAWIZ Reagent (available only in Japan), on RNAlater®
Solution-preserved samples, the aqueous phase will occasionally
appear cloudy; this will not adversely affect RNA recovery or
quality.
With RNAWIZ Reagent, there may be a problem getting the aqueous
phase to mix with isopropanol at the precipitation step because of
RNAlater® Solution carryover. If this occurs, add a mixture of
50% water, 50% isopropanol until the solution becomes clear and the
two phases mix. The amount of water/isopropanol required will
depend on how much RNAlater® Solution was carried over; if the
sample was mostly RNAlater® Solution, as much as an equal volume
may be needed.
Quality Control
RNAlater® Solution undergoes quality assurance testing to verify
that its composition is invariant from lot to lot.
Appendix A Safety Information
WARNING! GENERAL SAFETY. Using this product in a
manner not specified in the user documentation may result in
personal injury or damage to the instrument or device. Ensure
that anyone using this product has received instructions in
general safety practices for laboratories and the safety
information provided in this document.
• Before using an instrument or device, read and understand
the safety information provided in the user documentation
provided by the manufacturer of the instrument or device.
• Before handling chemicals, read and understand all
applicable Safety Data Sheets (SDSs), and use appropriate
personal protective equipment (gloves, gowns, eye
protection, etc.). To obtain SDSs, see the “Documentation
and Support” section in this document.
Chemical safety WARNING! GENERAL CHEMICAL HANDLING. To
minimize hazards, ensure laboratory personnel read and
practice the general safety guidelines for chemical usage,
storage, and waste provided below, and consult the relevant
SDS for specific precautions and instructions:
• Read and understand the Safety Data Sheets (SDSs) provided
by the chemical manufacturer before you store, handle, or work
with any chemicals or hazardous materials. To obtain SDSs, see
the “Documentation and Support” section in this document.
• Minimize contact with chemicals. Wear appropriate personal
protective equipment when handling chemicals (for example,
safety glasses, gloves, or protective clothing).
• Minimize the inhalation of chemicals. Do not leave chemical
containers open. Use only with adequate ventilation (for
example, fume hood).
• Check regularly for chemical leaks or spills. If a leak or spill
occurs, follow the manufacturer's cleanup procedures as
recommended in the SDS.
• Handle chemical wastes in a fume hood.
• Ensure use of primary and secondary waste containers. (A
primary waste container holds the immediate waste. A
secondary container contains spills or leaks from the primary
container. Both containers must be compatible with the waste
material and meet federal, state, and local requirements for
container storage.)
• After emptying a waste container, seal it with the cap provided.
• Characterize (by analysis if necessary) the waste generated by
the particular applications, reagents, and substrates used in
your laboratory.
• Ensure that the waste is stored, transferred, transported, and
disposed of according to all local, state/provincial, and/or
national regulations.
IMPORTANT! Radioactive or biohazardous materials may
require special handling, and disposal limitations may apply.
Biological hazard safety
WARNING! Depending on the samples used on the
instrument, the surface may be considered a biohazard. Use
appropriate decontamination methods when working with
biohazards
WARNING! BIOHAZARD. Biological samples such as
tissues, body fluids, infectious agents, and blood of humans
and other animals have the potential to transmit infectious
diseases. Follow all applicable local, state/provincial, and/or
national regulations. Wear appropriate protective equipment,
which includes but is not limited to: protective eyewear, face
shield, clothing/lab coat, and gloves. All work should be
conducted in properly equipped facilities using the
appropriate safety equipment (for example, physical
containment devices). Individuals should be trained
according to applicable regulatory and company/institution
requirements before working with potentially infectious
materials. Read and follow the applicable guidelines and/or
regulatory requirements in the following:
• U.S. Department of Health and Human Services guidelines
published in Biosafety in Microbiological and Biomedical
Laboratories found at: www.cdc.gov/biosafety
• Occupational Safety and Health Standards, Bloodborne
Pathogens (29 CFR§1910.1030; www.access.gpo.gov/nara/
cfr/waisidx_01/29cfr1910a_01.html).
• Your company’s/institution’s Biosafety Program protocols
for working with/handling potentially infectious
materials.
• Additional information about biohazard guidelines is
available at: www.cdc.gov
Documentation and Support
Obtaining SDSs Safety Data Sheets (SDSs) are available from:
• www.invitrogen.com/sds
or
• www.appliedbiosystems.com/sds
Note: For the SDSs of chemicals not distributed by Life
Technologies, contact the chemical manufacturer.
Obtaining support For the latest services and support information for all locations, go
to:
• www.invitrogen.com or
• www.appliedbiosystems.com
At the website, you can:
• Access worldwide telephone and fax numbers to contact
Technical Support and Sales facilities
• Search through frequently asked questions (FAQs)
• Submit a question directly to Technical Support
• Search for user documents, SDSs, vector maps and sequences,
application notes, formulations, handbooks, certificates of
analysis, citations, and other product support documents
• Obtain information about customer training
• Download software updates and patches