Technical library

Both products are Human Umbilical Vein Endothelial Cells (HUVEC) and are comparable in terms of culture conditions, passage number after thawing, and growth performance. The key differences relate to donor origin and preparation.
 
HUVEC single donor (C‑12200, C-12206)

• Isolated from one individual umbilical cord
• Expanded in primary culture and cryopreserved at subconfluency
• After thawing, cells are at passage 1 (P1)
• Represent the biological characteristics of a single donor

HUVEC pooled (C‑12203, C-12208)

• Cells are simultaneously isolated from 2-4 different umbilical cords
• Initially cultured in separate tissue‑culture dishes
• Cells are pooled after trypsinization, provided their growth rates are comparable
• After thawing, cells are also at passage 1 (P1)

Growth characteristics

• Doubling times are comparable for both products, typically 14–24 hours per population doubling
• HUVEC pooled cultures may show a slightly more heterogeneous morphology, with somewhat more elongated cells, compared to single‑donor HUVEC

Recommended culture media

Both HUVEC single donor (C-12200) and pooled HUVEC (C-12203) can be cultured in Endothelial Cell Growth Medium (C‑22010), or Endothelial Cell Growth Medium 2 (C‑22011). HUVEC 2, single donor (C‑12206), and pooled HUVEC 2 (C‑12208) are isolated directly in Endothelial Cell Growth Medium 2 and are therefore best cultured in Endothelial Cell Growth Medium 2 (C‑22011).

The heparin supplied with PromoCell Endothelial Cell Growth Media (C‑22010, C‑22011, C‑22020) is derived from porcine mucosa.

In general, the growth medium should be changed every 2-3 days.

Important notes after thawing

• After thawing, the first medium change should normally be performed after 16–24 hours to remove residual freezing medium.
• If a centrifugation step is performed after thawing and the cells are then seeded, the first medium change should be performed no earlier than 24 hours after seeding. This allows the cells sufficient time to recover and attach after the additional handling step.

Please note that the recommendations provided in the respective Instruction Manual should always be followed, as handling instructions may vary depending on the cell type.

To achieve high post‑thaw viability, please follow the protocol below for anchorage‑dependent primary human cells.

General thawing procedure
1. Remove the cryovial from liquid nitrogen and transport it to the cell culture laboratory on dry ice.
2. Thaw the vial in a 37°C water bath for approximately 2 minutes, until the contents are just defrosted. Keep the vial immersed up to, but not above, the screw cap.
3. Under a laminar flow hood, disinfect the outside of the vial thoroughly with 70% ethanol.
4. Transfer the thawed cell suspension into 9 ml of pre‑warmed culture medium (1:10 dilution).

Seeding options: Proceed with one of the following options:
Option A: Direct plating

• Plate the diluted cell suspension directly at the recommended seeding density.
• Change the medium after 16–24 hours.

Option B: With centrifugation

• Centrifuge the diluted cell suspension, discard the supernatant, and resuspend the cell pellet in 1 ml of fresh medium.
• Plate the cells at the recommended seeding density.
• Change the medium no earlier than 24 hours after seeding.

Note
For cell‑type‑specific handling recommendations, please refer to the Instruction Manual of the respective cell type, as thawing and seeding requirements may vary.

For mineralization assays, human osteoblasts (HOB) are cultured in Osteoblast Mineralization Medium (C‑27020).
Mineralization can typically be detected after approximately 3 weeks
Detection methods include:

• Ca‑45 incorporation, or
• Histochemical staining such as von Kossa or Alizarin Red, which visualize calcium deposition

Yes. PromoCell osteoblasts can be mineralized in vitro.
 
Short protocol overview

• Plate human osteoblasts in Osteoblast Mineralization Medium
• Use collagen type I-coated tissue culture vessels
• Incubate the cells for 17-21 days
• Change the medium every third day
• Handle cultures carefully to avoid disturbing the cell monolayer
• Fix the cells at the end of the incubation period

Detection of mineralization
Calcium deposition can be visualized using:

• von Kossa staining, or
• Alizarin Red staining

More detailed information on osteoblast mineralization and Alizarin Red S staining is provided in the Application Note "Osteoblast differentiation and mineralization". 

PromoCell Human Coronary Artery Smooth Muscle Cells (HCASMC, C‑12511) are isolated from large coronary arteries, rather than from small distal branches. The same origin also applies to Human Coronary Artery Endothelial Cells (HCAEC, C-12221).
The source arteries include:

• Right coronary artery 
• Left main coronary artery 
• Circumflex coronary artery 
• Left anterior descending coronary artery

Both trypsin and accutase are mixtures of proteolytic enzymes used for cell detachment and dissociation.

Trypsin

• Derived from porcine pancreas
• Commonly used for detaching anchorage‑dependent cells
• Typically requires an inactivation step (e.g. with serum or Trypsin Neutralizing Solution)

Accutase

• Derived from invertebrate sources
• Can be used to detach anchorage‑dependent cells and to reduce clumping of suspension cells, for example prior to cell counting
• Is more gentle than trypsin and generally results in higher cell viability
• Does not contain mammalian‑ or bacterially derived proteins
• Is more thermolabile than trypsin and usually does not require an inactivation step

Note
The suitability of trypsin or accutase depends on the cell type and application. Please refer to the Instruction Manual of the respective cell type for specific recommendations.

In our standard protocol, we recommend using trypsin at room temperature (RT). Using trypsin at RT helps to reduce the risk of over‑trypsinization and thereby minimizes the chance of irreversible cellular damage.
However, for some specific cell types and their corresponding media, detachment at 37°C is recommended to ensure efficient cell release.
The exact temperature and detachment conditions depend on the cell type and are clearly specified in the respective Product Manuals, which should always be followed.

Upon arrival, store the components as follows:

• Basal media: store at 4-8°C
• SupplementMixes/SupplementPacks: store at -20°C

These storage conditions help ensure the stability and performance of the media components.
 
Please note:

• The expiry dates of the basal medium and supplements are indicated on the respective product labels and should be observed.
• Once the supplements have been thawed and added to the basal medium, the complete medium should be stored at 4-8°C.
• In most cases, the complete medium is stable for up to 6 weeks after supplementation. Exceptions may apply and are indicated in the corresponding Instruction Manual.