Extracting cytoplasmic material such as proteins, RNA, and mitochondria often relies on cell lysis using detergents or enzymes, which destroy the cells. Ultrasound and other sophisticated physical disruption methods need to be carefully tuned to avoid damaging biomolecules, potentially rendering them too time-consuming. Delivering material into cells presents further challenges. Lipid-based carriers are limited to small molecules, viral vectors are costly, and microinjection techniques are difficult to scale. To date, no approach allows for controlled and efficient cytoplasmic transfer without compromising cell viability, according to researchers from Waseda University in Japan. The team published a study “A Nanotube Injector for Cytoplasmic Transfer and Enhanced Mitochondrial Function” in Small Science that reports the development of a nanotube membrane-based injector—a platform that combines nanomaterials and fluid physics to directly transfer cytoplasmic contents between cell populations. The system consists of a thin gold membrane with vertically aligned nanotubes mounted on a glass tube. When this membrane is carefully pressed against cultured cells, the nanotubes penetrate the phospholipid bilayer of the living cells without causing significant damage. By adjusting the internal air pressure of the glass tube, the researchers can “suck up” cytoplasmic material from the source cells, hold it as the tube is repositioned over the target cell culture, and gently flush it into this new population using microliters of a buffer solution. Credit: Waseda University Through several experiments using fluorescent dyes and protein assays, the researchers say they confirmed that cytoplasmic contents could be extracted in a pressure-dependent manner. They also found…
