First-time users are encouraged to contact Core staff to discuss their experiments for advice on tissue collection, fixation, embedding, and stains.
- Supplies (*free to MPC users)
- *10% neutral buffered formalin in 8 oz. specimen cups (NBF, ThermoFisher, 23-032-060)
- *Specimen plastic containers (all sizes, recycled)
- *Cassettes (biopsy, regular, and macro sizes)
- *Biopsy sponges and bags for use in regular cassettes
- Items needed to rent microtome and cryostat can be purchased when small numbers are needed.
- Paraffin slides- trim, process, embed, section, stain, microscopy, analyze
- Frozen slides- sucrose cryoprotection for fixed, embedding for fresh or fixed, section, stain, microscopy, analyze
- Sectioning of thick tissue curls for DNA/RNA isolation
- DNAse/RNAse free slide sectioning
- H&E and Special stains: PAS/PASD, Oil red O (frozen only), Van Gieson’s, Congo Red, Masson’s Trichrome, Luxol Blue, others.
Paraffin processing is performed using automatic processors (VIP6, Leica) with graded ethanols (70-100%) and xylene. Fixations are done in one’s own lab and ended before submitting for processing. Standard programs are based on species, tissue size, and/or fat content. Customized programs can be set up to your specifications.
Samples are routinely sectioned at 4um thickness unless another thickness requested.
Serveral different levels of sectioning are available for paraffin and frozen tissues (adapted from Gladstone Histology Core, UCSF):
1 – Simple sectioning- block is trimmed to full face and 1 unstained section placed on a slide. The total number of slides needed depends on what you need ie H&E, IHC, or only unstained slides.
2 – Levels – unstained sections are placed on a slide, then a certain distance (um) is discarded and then another section is placed on a slide. Indicate the level’s distance you want on the submission form. Levels are often requested when a large amount of tissue is to be surveyed and every section doesn’t need to be kept. Don’t forget to get extra slides as once a level is cut through, there is no retrieving it.
Personalized services are available such as working with a histotechnician to identify structures of special interest while the tissue is being sectioned or for developing a new procedure. Contact us for more information.