pH-dependent RNA isolation from cells encapsulated in chitosan-based biomaterials

Area of Science:

• Biomaterials Science
• Molecular Biology
• Tissue Engineering

Background:

• Chitosan is a versatile biomaterial for tissue engineering and drug delivery.
• Chitosan's positive charge at biological pH complicates conventional RNA extraction.
• Efficient RNA extraction is vital for analyzing gene expression in cells within chitosan scaffolds.

Purpose of the Study:

• To investigate the impact of homogenate pH manipulation on RNA yield and quality during extraction from chitosan-based scaffolds.
• To determine the pH-dependent interaction between RNA and chitosan during extraction.
• To compare the efficacy of different RNA extraction methods under varying pH conditions.

Main Methods:

• Adult neural stem/progenitor cells (aNSPCs) were encapsulated in methacrylamide chitosan (MAC) scaffolds.
• RNA extraction was performed using TRIzol, CTAB, and RNeasy spin columns.
• The pH of the homogenate during tissue disruption was systematically altered.

Main Results:

• High pH conditions (TRIzol and CTAB) yielded higher RNA concentrations and good quality.
• RNeasy spin columns performed best at neutral pH, yielding good quality but low overall RNA amounts.
• RNA release and binding from chitosan scaffolds were confirmed to be pH-dependent.

Conclusions:

• Chitosan-based scaffold properties necessitate pH-controlled RNA extraction protocols.
• Extraction method choice is critical for optimizing RNA yield and purity from chitosan-encapsulated cells.
• pH adjustment during homogenization is a key factor in successful RNA isolation from chitosan biomaterials.