Dermal-Epidermal Cross-Talk: Differential Interactions With Microvascular Endothelial Cells

Area of Science:

• Cell Biology
• Dermatology
• Tissue Engineering

Background:

• Circulatory blood supply and angiogenesis are crucial for hair growth.
• Regulatory mechanisms governing these processes require further investigation.
• In vitro models like cocultures and tricultures can elucidate paracrine signaling between dermal and vascular cells.

Purpose of the Study:

• To investigate paracrine crosstalk between dermal and vascular cells in vitro.
• To characterize the interactions between human dermal fibroblasts (NHDF), human microvascular endothelial cells (HMVEC), and keratinocytes.
• To assess the impact of these interactions on cell proliferation, metabolism, and inflammation.

Main Methods:

• In vitro coculture and triculture systems were established.
• Human dermal fibroblasts (NHDF) and human microvascular endothelial cells (HMVEC) were co-cultured.
• Triculture models included NHDF, HMVEC, and either follicle fibroblasts or keratinocytes.
• Conditioned media from cocultures were used to treat keratinocytes.
• Cell viability, proliferation, metabolic markers, and inflammatory markers were analyzed.

Main Results:

• NHDF promoted the viability and proliferation of HMVECs.
• HMVECs did not exhibit mitogenic effects on NHDF.
• Conditioned media from cocultures differentially modulated keratinocyte growth and proliferation.
• Conditioned media altered the expression of metabolic and pro-inflammatory markers in keratinocytes.

Conclusions:

• Triculture models are effective for studying dermal-epithelial and endothelial interactions in vitro.
• These models provide insights into the complex cellular crosstalk influencing hair follicle biology.
• Standardized, high-throughput in vitro approaches can complement ex vivo and in vivo studies.