Stem Cell-Soluble Signals Enhance Multilumen Formation in SMG Cell Clusters

Area of Science:

• Biomedical Engineering
• Stem Cell Biology
• Oral Health Research

Background:

• Saliva is crucial for oral health; salivary hypofunction causes significant issues like decay and infections.
• Current hyposalivation treatments are limited, necessitating advancements in restorative therapies.
• Previous work showed salivary cells form structures on laminin-rich Matrigel.

Purpose of the Study:

• To enhance salivary gland cell differentiation in primary cultures.
• To investigate the combined effect of laminin-III (L1) and human hair follicle-derived mesenchymal stem cells (hHF-MSCs) as a feeder layer.
• To explore the role of soluble factors from hHF-MSCs in salivary cell organization.

Main Methods:

• Primary mouse submandibular (mSMG) gland cells were cultured.
• Cells were grown on growth factor-reduced Matrigel, with and without hHF-MSCs.
• The impact of direct cell contact versus conditioned medium from hHF-MSCs was assessed.

Main Results:

• Mouse submandibular gland cells formed acinar and ductal structures without direct contact with hHF-MSCs.
• hHF-MSC conditioned medium significantly improved cell organization and multilumen formation.
• Soluble factors secreted by hHF-MSCs appear crucial for promoting these structural features.

Conclusions:

• Human hair follicle-derived mesenchymal stem cells can support salivary gland cell differentiation.
• Soluble factors from hHF-MSCs are key to enhancing salivary cell organization and structure formation.
• This approach holds potential for developing novel regenerative treatments for hyposalivation.