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Both ERK1 and ERK2 are crucial for enterovirus 71 (EV71) replication, with the late phase of their activation being particularly important for the virus life cycle.

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Area of Science:

  • Virology
  • Molecular Biology
  • Cell Signaling

Background:

  • The Raf-MEK-ERK1/2 pathway is vital for viral propagation.
  • MEK1 is essential for EV71 replication, but the roles of ERK1 and ERK2 remain unclear.

Purpose of the Study:

  • To investigate the distinct functions of ERK1 and ERK2 in EV71 replication.
  • To determine the importance of ERK1/2 activation phases in the EV71 life cycle.

Main Methods:

  • Used specific ERK small interfering RNAs (siRNAs) for gene silencing.
  • Applied the selective MEK inhibitor U0126.
  • Assessed EV71 propagation, RNA amplification, and protein synthesis.

Main Results:

  • Silencing ERK1 or ERK2 significantly impaired EV71 propagation, RNA amplification, and protein synthesis.
  • ERK1 and ERK2 activations were independent and non-discriminative during EV71 infection.
  • Inhibiting the late phase of ERK1/2 activation was sufficient to suppress EV71 replication.

Conclusions:

  • Both ERK1 and ERK2 are essential and non-interchangeable for efficient EV71 replication.
  • The late phase of ERK1/2 activation plays a critical role in the EV71 life cycle.
  • Confirms the significance of the MEK1-ERK1/2 pathway in EV71 replication.