The Unfolded Protein Response: A Key Player in Zika Virus-Associated Congenital Microcephaly

Area of Science:

• Virology
• Neuroscience
• Developmental Biology

Background:

• Zika virus (ZIKV), a Flaviviridae family member, emerged in the Americas causing significant public health concerns.
• ZIKV is teratogenic and sexually transmissible, notably linked to congenital microcephaly.
• Understanding ZIKV's impact on fetal development is crucial.

Purpose of the Study:

• To review the critical impact of the unfolded protein response (UPR) on ZIKV-associated congenital microcephaly.
• To elucidate the pathophysiological mechanisms linking ZIKV infection to microcephaly.
• To highlight the therapeutic potential of targeting the UPR pathway.

Main Methods:

• Review of existing literature on ZIKV, congenital microcephaly, and the unfolded protein response (UPR).
• Analysis of studies investigating ZIKV infection in cortical neuron progenitors.
• Examination of the role of endoplasmic reticulum (ER) stress and UPR activation in neurodevelopmental defects.

Main Results:

• ZIKV infection induces significant endoplasmic reticulum (ER) stress in cortical neuron progenitors.
• This ER stress activates the unfolded protein response (UPR), leading to stalled neurogenesis and neuronal apoptosis.
• UPR activation is directly linked to the development of cortical microcephaly.
• Administration of UPR-inhibiting molecules successfully prevented ZIKV-induced cortical microcephaly in experimental models.

Conclusions:

• The unfolded protein response (UPR) is a key mediator of ZIKV-induced congenital microcephaly.
• Targeting the UPR pathway presents a promising therapeutic strategy for preventing ZIKV-related birth defects.
• The UPR's role in ZIKV pathogenesis may extend to other reported ZIKV-associated developmental abnormalities.