« Back to all products listing page


WIT-T™ Medium


Cellaria’s WIT-T™ Culture Medium has been specifically optimized for the robust culture of human mammary epithelial cells of transformed phenotype (e.g., immortalized cells transformed either with SV40 early region, termed BPLE cells, or with both SV40 early region and H-ras, known as BPLER cells), an important experimental model for the study of tumor cell biology1-3. Transformed human mammary epithelial cells grown in WIT-T Culture Medium yield tumors that more closely resemble naturally occurring human adenocarcinomas than cells grown in other epithelial cell culture media such as MEGM1,2.

  • Serum-free and chemically-defined culture environment
  • No feeder cells required
  • Fewer BPLER cells required for tumor formation
  • WIT-T supports highly tumorigenic and metastatic BPLER cells

Disease Area: Cancer

Tissue Type: Breast

Storage and Stability

Store basal medium at 4°C. Store supplement at -20°C. Basal medium and supplement are stable for a minimum of 3 months from date of receipt, when stored as directed.

Quality Control

Transformed cells are tested for proliferation and morphology during culture over three continuous passages. Product sterility is confirmed by negative test results for bacteria, fungi, and mycoplasma.



  • Cellaria WIT-P Culture Medium (Cellaria Cat. No. CM-0101) or WIT-P-NC Culture Medium (Cellaria Cat. No. CM-0104)
  • Cellaria WIT-T Culture Medium (Cellaria Cat. No. CM-0103)
  • Cholera Toxin, Vibrio cholerae, Type Inaba 569B (EMD Cat. No. 227036)
  • Collagenase A (Roche Cat. No. 11088785103)
  • Primaria™ Cell Culture Flask 25 cm (Corning Cat. No. 353808)

Preparation of Complete WIT Medium

  1. Thaw the vial of WIT supplement in a 37°C water bath.
  2. In a sterile environment, add the entire contents of the WIT supplement vial to the bottle of WIT Basal Medium.
  1. If using WIT-P-NC (Cellaria Cat. No. CM-0104) add cholera toxin at the following concentrations:

WIT-P-NC: Add cholera toxin to a final concentration of 100 ng/ml

Note: When handling cholera toxin, the supplement vials For WIT-P media, or when performing cell culture using medium with cholera toxin, gloves, lab coat and eye protection should be worn. Any media spills should be cleaned immediately. Cell culture environments should be wiped down (70% ethanol and bleach) after completing work with either of these media.

Preparation of Breast Primary Epithelial Cells (BPECs)

  1. Using a sterile scalpel in a sterile environment, on ice, mince human mammary tissue to 1mm3 pieces.
  2. Transfer minced tissue to a 15 ml conical tube and add 1 mg/ml Collagenase A in Hank’s buffered salt solution (HBSS). With a sterile pipette, mix the solution until the tissue is well suspended. Allow the tissue to dissociate in this solution at 37°C for 6 to 8 hours with constant slow rotation.
  1. After dissociation, transfer the mixture to polypropylene conical tubes and centrifuge at 10 x g for 5 minutes.
  1. Remove and discard the fat layer above the pellet. Resuspend the pellet in an appropriate amount of WIT-P Medium. Plate at approximately 10 to 20 organoids per cm2 in Primaria™ Cultureware. Each culture dish should contain between 10 ml and 20 ml of medium per 25 cm2 of plate surface area.

 Note: Do not dissociate the organoids to single cells using trypsin digestion or other mechanical or enzymatic methods. Such treatment will severely reduce the number of isolated BPEC colonies. Also, the use of Primaria™ Cultureware is critical for the culture of all types of breast epithelial cells.

  1. Culture the sample for an additional 10 to 15 days at 37°C and 5% CO2, changing the WIT-P medium every 2 days. Use between 10 ml and 20 ml of medium per 25 cm2 of plate surface area.

Culture and Subculture of Cells in WIT (WIT-P or WIT-T) Media

  1. Maintain cultures on Primaria™ Cultureware plates at 37°C and 5% CO2.
  2. The WIT-P culture media should be changed:
    1. BPECs: every 2 days with WIT-P medium.
    2. Transformed derivatives: every 3 days with WIT-T medium.
  3. When the culture is 75 to 95% confluent, it should be passaged.
  4. Dissociate cells by treatment with 0.15% trypsin at 37°C for no more than 2 to 3 minutes. Dislodge cells from the plate surface by shaking or gently knocking the plate against your hand. Do not use cell scrapers to remove cells from the plate.
  5. Inactivate the trypsin by adding 10 ml of the appropriate WIT medium supplemented with 20% fetal bovine serum for every 1 ml of 0.15% trypsin used.
  6. Using polypropylene centrifuge tubes centrifuge the cells at 500 x g for 5 minutes and remove the supernatant. Add a sufficient amount of WIT medium to resuspend the cells for counting.

Note: Use of polypropylene tubes for pelleting BPECs (and their derivatives) is critical because these cells will not form a pellet when they are centrifuged in other types of plastic tubes such as polystyrene.  

7. Re-plate the cells in the appropriate WIT medium at a density of 1 x 104 cells per cm2, and continue to culture at 37°C and 5% CO2.

Note: Do not re-plate cells, particularly BPECs, at densities less than 7.5 x 103 cells per cm2, or more than 1.5 x 104 cells per cm2.

  1. Change the medium 24 hours after plating, and thereafter every 2 days.

Note: It is common to observe some dead cells in the first 24-48 hours after subculturing.


Primeria™ is a Trademark of Corning Inc.

For Technical Support, call 1-617-981-4208.


Connect With Us

Learn more about how Cellaria can help transform your research efficacy.

Speak to a scientist or have a general inquiry

To help us better serve you, please provide a few more pieces of information:

Subscribe to Cellaria emails

Get the latest news on Cellaria's products, services, and events.

To help us better serve you, please provide a few more pieces of information: