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TIME are hTERT-immortalized cells exhibiting endothelial-like morphology that were isolated from a primary culture of neonatal foreskin microvascular endothelial cells (HMVEC) of the dermis. This product has applications for drug development and cardiovascular disease research.
Product category
Human cells
Product type
hTERT-immortalized cell
Homo sapiens, human
Cell type
endothelial cell
Skin; Dermal microvascular endothelium; Foreskin
3D cell culture
Cardiovascular disease research
Drug development
High-throughput screening
Product format
Storage conditions
Vapor phase of liquid nitrogen
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ATCC determines the biosafety level of a material based on our risk assessment as guided by the current edition of Biosafety in Microbiological and Biomedical Laboratories (BMBL), U.S. Department of Health and Human Services. It is your responsibility to understand the hazards associated with the material per your organization’s policies and procedures as well as any other applicable regulations as enforced by your local or national agencies.

Cells contain Encephalomyocarditis virus (EMCV) DNA sequences

ATCC highly recommends that appropriate personal protective equipment is always used when handling vials. For cultures that require storage in liquid nitrogen, it is important to note that some vials may leak when submersed in liquid nitrogen and will slowly fill with liquid nitrogen. Upon thawing, the conversion of the liquid nitrogen back to its gas phase may result in the vial exploding or blowing off its cap with dangerous force creating flying debris. Unless necessary, ATCC recommends that these cultures be stored in the vapor phase of liquid nitrogen rather than submersed in liquid nitrogen.

Required Products

These products are vital for the proper use of this item and have been confirmed as effective in supporting functionality. If you use alternative products, the quality and effectiveness of the item may be affected.

Detailed product information


Specific applications

The cells represent an effective cell model for studying endothelial cell biology including signal transduction and angiogenesis.


Growth properties

The telomerase-immortalized human microvascular endothelium cell line, TIME, was derived from a primary culture of neonatal foreskin microvascular endothelial cells (HMVEC) of the dermis. 

The primary HMVECs were immortalized by infection with the retrovirus WZLblast3:hTERT and cultured in complete growth medium containing blasticidin. 

Immortalization method
hTERT expression
This is a diploid cell line of male origin with a modal chromosome number of 46 and a low rate of polyploidy. The line shows some karyotypic instability at later passages.
Antigen expression
Positive for integrin alpha v beta 3 RefVenetsanakos E, et al. Induction of tubulogenesis in telomerase-immortalized human microvascular endothelial cells by glioblastoma cells. Exp. Cell Res. 273(1):21-33, 2002. PubMed: 11795943 and CD31 (flow cytometry) RefVenetsanakos E, et al. Induction of tubulogenesis in telomerase-immortalized human microvascular endothelial cells by glioblastoma cells. Exp. Cell Res. 273(1):21-33, 2002. PubMed: 11795943
Expression markers
The cells express the low density lipoprotein (LDL) receptor and are capable of acetylated LDL uptake

The immortalized cells do not undergo growth arrest in culture due to the exogenous hTERT expression.

When plated on Matrigel, TIME cells undergo tubule formation exhibiting capillary-like structures.

Handling information

Unpacking and storage instructions
  1. Check all containers for leakage or breakage.
  2. Remove the frozen cells from the dry ice packaging and immediately place the cells at a temperature below ­-130°C, preferably in liquid nitrogen vapor, until ready for use.
Complete medium
The base medium for this cell line is Vascular Cell Basal Medium (ATCC® PCS-100-030), supplemented with Microvascular Endothelial Cell Growth Kit-VEGF (ATCC® PCS-110-041) and 12.5 μg/mL blasticidine.
95% Air, 5% CO2
Handling procedure
To ensure the highest level of viability, thaw the vial and initiate the culture as soon as possible upon receipt. If storage of the frozen culture is necessary upon arrival, store the vial in liquid nitrogen vapor phase and NOT at –70°C. Storage at –70°C will result in loss of viability.
  1. Prepare a 25 cm2 or a 75 cm2 culture flask containing the recommended complete culture medium. Prior to the addition of the vial contents, the vessel containing the growth medium should be placed in the incubator for at least 15 minutes to allow the medium to reach its normal pH (7.0 to 7.6) and to avoid excessive alkalinity of the medium during recovery of the cells.
  2. Thaw the vial by gentle agitation in a 37°C water bath. To reduce the possibility of contamination, keep the O-ring and cap out of the water. Thawing should be rapid (approximately 2 minutes).
  3. Remove the vial from the water bath as soon as the contents are thawed, and decontaminate by dipping in or spraying with 70% ethanol. All operations from this point on should be carried out under strict aseptic conditions.
  4. Transfer the vial contents to a centrifuge tube containing 9.0 mL of complete culture medium and centrifuge the cell suspension at approximately 125 x g for 5 to 7 minutes.
  5. Discard the supernatant and resuspend the cells in fresh growth medium (see the batch-specific information for the recommended dilution ratio). Add this suspension to the prepared culture vessel.
  6. Incubate the culture at 37°C in a suitable incubator.
  7. A 5% CO2/95% air atmosphere is recommended if using the medium described on this product sheet.
Subculturing procedure

Volumes used in this protocol are for 75 cm2 flasks; proportionally reduce or increase amount of dissociation medium for culture vessels of other sizes.
Note: Subculture when cultures are about 80% confluent.

  1. Prior to subculturing, determine the number of flasks needed. Add the appropriate volume of medium to each flask and allow the flasks to equilibrate in a 37°C, 5% CO2, humidified incubator for at least 30 minutes. If not using vented caps, loosen caps of flasks.
  2. Remove and discard spent medium.
  3. Briefly rinse the cells with Dulbecco's Phosphate Buffered Saline (D-PBS, ATCC 30-2200) and discard rinse solution.
  4. Add 2.0 to 3.0 mL room temperature Trypsin-EDTA for Primary Cells (ATCC PCS-999-003) to the flask. Incubate at 37°C for 5 min (until cells have detached).
  5. Neutralize trypsin by adding an equal volume of room temperature 2% FBS in D-PBS.
  6. Transfer cells to a centrifuge tube. Rinse the flask with an additional room temperature 2% FBS in D-PBS and pool into centrifuge tube with cells.
  7. Centrifuge cells at 250 x g for 10 min at room temperature.
  8. Remove supernatant. Resuspend pellet in 6.0 to 8.0 mL Complete Growth Medium.
  9. Count cells, and seed 5 x 103 to 8 x 103 viable cells/cm2 to new culture vessels. Subculture when cells become 80 to 90% confluent, which normally yield approximately 3.0 x 104 viable cells/cm2.
  10. Incubate cultures at 37°C in a 5% CO2 humidified incubator.
Subcultivation ratio: A subcultivation ratio of 1:4 to 1:6 is recommended.
Medium renewal: Every 2 to 3 days 

Note: For more information on enzymatic dissociation and subculturing of cell lines consult Chapter 13 in Culture of Animal Cells: A Manual of Basic Technique by R. Ian Freshney.

Quality control specifications

Mycoplasma contamination
Not detected
Population doubling capacity
≥ 15 in complete growth medium
STR profiling
Amelogenin: X,Y
CSF1PO: 11,12
D13S317: 9,11
D16S539: 9,12
D5S818: 11
D7S820: 8,9
TH01: 6,7
vWA: 16,18
D3S1358: 14,15
D21S11: 30
D18S51: 17
Penta_E: 7,16
Penta_D: 9,13
D8S1179: 11,13
FGA: 19,25
D19S433: 13,15
D2S1338: 18,20


M McMahon
Year of origin

Legal disclaimers

Intended use
This product is intended for laboratory research use only. It is not intended for any animal or human therapeutic use, any human or animal consumption, or any diagnostic use.

The product is provided 'AS IS' and the viability of ATCC® products is warranted for 30 days from the date of shipment, provided that the customer has stored and handled the product according to the information included on the product information sheet, website, and Certificate of Analysis. For living cultures, ATCC lists the media formulation and reagents that have been found to be effective for the product. While other unspecified media and reagents may also produce satisfactory results, a change in the ATCC and/or depositor-recommended protocols may affect the recovery, growth, and/or function of the product. If an alternative medium formulation or reagent is used, the ATCC warranty for viability is no longer valid.  Except as expressly set forth herein, no other warranties of any kind are provided, express or implied, including, but not limited to, any implied warranties of merchantability, fitness for a particular purpose, manufacture according to cGMP standards, typicality, safety, accuracy, and/or noninfringement.


This product is intended for laboratory research use only. It is not intended for any animal or human therapeutic use, any human or animal consumption, or any diagnostic use. Any proposed commercial use is prohibited without a license from ATCC.

While ATCC uses reasonable efforts to include accurate and up-to-date information on this product sheet, ATCC makes no warranties or representations as to its accuracy. Citations from scientific literature and patents are provided for informational purposes only. ATCC does not warrant that such information has been confirmed to be accurate or complete and the customer bears the sole responsibility of confirming the accuracy and completeness of any such information.

This product is sent on the condition that the customer is responsible for and assumes all risk and responsibility in connection with the receipt, handling, storage, disposal, and use of the ATCC product including without limitation taking all appropriate safety and handling precautions to minimize health or environmental risk. As a condition of receiving the material, the customer agrees that any activity undertaken with the ATCC product and any progeny or modifications will be conducted in compliance with all applicable laws, regulations, and guidelines. This product is provided 'AS IS' with no representations or warranties whatsoever except as expressly set forth herein and in no event shall ATCC, its parents, subsidiaries, directors, officers, agents, employees, assigns, successors, and affiliates be liable for indirect, special, incidental, or consequential damages of any kind in connection with or arising out of the customer's use of the product. While reasonable effort is made to ensure authenticity and reliability of materials on deposit, ATCC is not liable for damages arising from the misidentification or misrepresentation of such materials.

Please see the material transfer agreement (MTA) for further details regarding the use of this product. The MTA is available at

Permits & Restrictions

Material Transfer Agreement Addendum for Screening Applications

For-profit organizations
For every order of this item, you must provide a signed Material Transfer Agreement Addendum for Screening Applications. We cannot ship this item until we receive this addendum. The person signing the addendum as the principal investigator must match the end user as listed on the applicable sales order for the item.

Email the signed addendum to [email protected] with a reference to both your account and sales order numbers. Once received, your addendum will be reviewed, and this item will be released for shipment if all requirements are met. Additional fees may apply if this product is being used for a screening use (ATCC ACS-2103F), and these fees will be applied after your order is confirmed. If you need assistance with your order, please contact our Customer Care team or your applicable distributor.

Import Permit for the State of Hawaii

If shipping to the U.S. state of Hawaii, you must provide either an import permit or documentation stating that an import permit is not required. We cannot ship this item until we receive this documentation. Contact the Hawaii Department of Agriculture (HDOA), Plant Industry Division, Plant Quarantine Branch to determine if an import permit is required.



Curated Citations

Venetsanakos E, et al. Induction of tubulogenesis in telomerase-immortalized human microvascular endothelial cells by glioblastoma cells. Exp. Cell Res. 273(1):21-33, 2002. PubMed: 11795943

Lagunoff M, et al. De novo infection and serial transmission of Kaposi's sarcoma-associated herpesvirus in cultured endothelial cells. J. Virol. 76(5):2440-2448, 2002. PubMed: 11836422

Yi X, et al. Both transcriptional and posttranscriptional mechanisms regulate human telomerase template RNA levels. Mol. Cell. Biol. 19(6): 3989-3997, 1999. PubMed: 10330139

Bodnar AG, et al. Extension of life-span by introduction of telomerase into normal human cells. Science 279: 349-352, 1998. PubMed: 9454332

Caputo JL. Biosafety procedures in cell culture. J. Tissue Culture Methods 11:223-227, 1988

View All Curated Citations for this Product

Frequently Asked Questions

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