Dr. Martin P. Stewart
School of Life Sciences
University of Technology Sydney
Australia

Date: Friday, 22-February-2019
Time: 2:00 p.m.
Venue: Seminar Room 1-19, 3/F, Laboratory Block, Faculty of Medicine Building
21 Sassoon Road, Pokfulam, Hong Kong

Summary:
This talk will cover two aspects of cell mechanobiology:

1. recent insights into the mechanics of mitotic cell rounding, and
2. the use of controlled, rapid cell deformations and electric fields for intracellular delivery.

1. Mechanics and Shape of Cells in Mitosis: The forces that control cell shape are fundamental to cell function and growth. We developed an atomic force microscope (AFM)-based approach to analyze the forces generated by cells as they round up during mitosis. Three major insights arose from this work: First, that intracellular pressure increases throughout mitosis to drive mitotic cell rounding. Second, that cells under mechanical challenge undergo cell cortex herniation and inhibition of mitotic progression when a critical force is reached. And third, the elucidation of previously uncharacterized genes that underpin mitotic cell rounding through an RNAi-based mechanical phenotyping approach.
2. Combined Mechanical and Electrical Treatment for Intracellular Delivery: Biomedical research heavily relies on the introduction of foreign DNA, RNA, proteins, and other bioactive molecules to the intracellular space. Membrane disruption-based methods have emerged as key strategies for rapid, direct and universal delivery of a wide range of cargoes into cells. Here, we have implemented a microfluidic approach for combining mechanical deformation and electric fields for direct delivery of DNA into the nucleus at high throughput. We find that this treatment is able to mediate rapid expression of DNA via means of reversible non-lethal disruptions to the plasma membrane and nuclear envelope.

ALL ARE WELCOME