The need for cellular and molecular sensors and actuators

Area of Science:

• Systems biology
• Micro- and nanoengineering
• Nanobiology and Nanomedicine

Background:

• A single mammalian cell involves over 100,000 variables, with cell-cell interactions critical for system function.
• Current methods, like fluorescent imaging, can only record about five dynamic intracellular variables simultaneously.
• Traditional approaches of holding most variables constant are insufficient for understanding complex biological networks.

Purpose of the Study:

• To highlight the significant micro- and nanoengineering challenges in systems biology.
• To emphasize the need for advanced techniques to record and control multiple dynamic variables in single cells.
• To discuss the development of artificial nanosensors and nanoactuators for biological research and nanomedicine.

Main Methods:

• Review of current limitations in measuring dynamic variables within single cells.
• Exploration of emerging artificial nanosensors, including ligand-gated ion channels and nanocrystal reporters.
• Discussion of nanoactuators such as nanofibers for DNA delivery and metal nanoshells for localized heating.

Main Results:

• Existing methods inadequately capture the dynamics of highly interconnected, distributed nonlinear biological networks.
• Significant engineering challenges exist in developing technologies for broad impact in biology and medicine.
• Advancements in nanoscience are crucial for creating sophisticated tools for biological research.

Conclusions:

• Effective systems biology requires overcoming the limitations of current measurement techniques.
• The development of novel nanosensors and nanoactuators is essential for progress in nanobiology and nanomedicine.
• Future engineering efforts must focus on recording and controlling multiple cellular variables and creating addressable nanoactuators.