Technical library

Human MSCs are a heterogeneous population, and not all cells will differentiate into osteoblasts.
Differentiation efficiency depends strongly on the tissue source:

• hMSC‑BM: very good osteogenic differentiation
• hMSC‑AT: very good osteogenic and adipogenic differentiation
• hMSC‑UC: weak osteogenic differentiation, mainly chondrogenic

To obtain a high percentage of osteoblast‑like cells, hMSC‑BM or hMSC‑AT are the preferred sources. Please note that lot‑to‑lot variability exists, and differentiation capacity decreases with increasing passage number.
If particularly strong osteogenic differentiation is required, PromoCell Scientific Support can assist with lot selection prior to ordering.

When cultured in Mesenchymal Stem Cell Growth Medium 2 (C‑28009), PromoCell human Mesenchymal Stem Cells (hMSC‑BM, hMSC‑AT, hMSC‑UC) typically show population doubling times of 20- 30 hours. This value represents the mean population doubling time, including the lag phase, measured over 10 population doublings. The Quality Control specification is ≤ 30 hours.

From seeding to subculture: If hMSCs are seeded at a density of 4,000 cells/cm²:

• Cells usually reach subconfluency within 4-7 days
• At this point, they are ready for subculturing

Actual growth rates may vary slightly depending on:

• donor source
• passage number
• handling and culture conditions

For human mononuclear cell (hMNC-PB) lots, PromoCell determines the proportions of the main cell populations (lymphocytes, monocytes, granulocytes) using flow cytometry without antibody staining.
 
Method used for hMNC lots

• Cell populations are distinguished by forward scatter (FSC) and side scatter (SSC) characteristics in a flow cytometer.
• FSC reflects cell size, while SSC reflects cellular granularity/complexity.
• Based on these physical properties, lymphocytes, monocytes, and granulocytes form distinct clusters, allowing estimation of their relative percentages without staining.

This FSC/SSC‑based analysis is sufficient for mixed mononuclear cell preparations (hMNC) and is documented in the Certificate of Analysis. 
 
Additional QC for purified monocytes
For purified CD14⁺ monocytes, PromoCell performs additional antibody staining for CD14 and confirms purity by flow cytometry.

Using PromoCell DC Generation Medium or DC Generation Medium XF, it takes approximately 7-8 days to generate fully mature myeloid dendritic cells from monocytes.

Based on PromoCell’s experience, monocyte‑derived dendritic cells (DCs) can be maintained in culture for approximately 3 up to a maximum of 7 days after completion of differentiation (day 7/8 of the protocol).
 
Important considerations

• During this post‑differentiation period, cell morphology will gradually change
• Over time, the cells may appear increasingly degenerate
• Functional and phenotypic stability may therefore decline with prolonged culture

For optimal experimental results, it is recommended to use the cells as soon as possible after differentiation is completed. Additional guidance is provided in the Application Note "Generation of Monocyte-derived Dendritic Cells (moDCs)".

The vena saphena section used for the isolation of human saphenous vein endothelial cells (HSaVEC) originates from the thigh.

Juvenile Human Dermal Microvascular Endothelial Cells (HDMEC, C‑12210) are isolated from the dermis of foreskin.
Adult Human Dermal Microvascular Endothelial Cells (HDMEC, C‑12212) are isolated from various anatomical regions, including:
- abdomen
- temple
- breast
- eyelid
- labia
If you require HDMEC from a specific anatomical location, please contact PromoCell Scientific Support. Our team will be happy to help you identify suitable cell lots and find the best match for your research needs.

PromoCell human pulmonary artery endothelial cells (HPAEC, C‑12241) are harvested directly from the pulmonary artery.
For isolation, the pulmonary artery is explanted at its origin from the heart, including the arterial bifurcation. The HPAEC therefore represent the innermost endothelial cell layer of the pulmonary artery, i.e. macrovascular endothelial cells.
In contrast, PromoCell also offers human pulmonary microvascular endothelial cells (HPMEC, C‑12281), which are isolated from capillaries of peripheral lung tissue.

For routine in vitro angiogenesis assays, Human Umbilical Vein Endothelial Cells (HUVEC) are the most commonly used endothelial cell type due to their availability, robust growth characteristics, and reliable performance in assays such as tube formation, migration, and sprouting assays.
However, angiogenesis in vivo primarily involves the formation of new capillaries from the microvascular endothelium. Therefore, Human Dermal Microvascular Endothelial Cells (HDMEC) and other primary human microvascular endothelial cells may provide a more physiologically relevant model for studying angiogenesis.
Compared with HUVEC, microvascular endothelial cells more closely represent the small-vessel compartment involved in tissue vascularization and may therefore yield more biologically relevant responses to angiogenic stimuli.
 
Recommendation:

• HUVEC are well suited for routine screening, assay development, and comparative studies.
• HDMEC or other microvascular endothelial cells are recommended when a physiologically relevant model of capillary angiogenesis is required.

PromoCell human pulmonary microvascular endothelial cells (HPMEC, C‑12281) are isolated from peripheral lung tissue of adult donors.