A study in non-human primates revealed a species-specific function of MANF, a non-canonical neurotrophic factor
Higher Education Press
image:
Species-specific mechanism of MANF in the brain. In monkeys, MANF knockdown triggers a reduction in downstream LIF expression, subsequently decreasing the STAT3 signaling pathway and leading to selective astrocyte apoptosis. This mechanism is absent in mice. Notably, supplementation with exogenous LIF protein effectively rescues astrocytes from MANF-deficiency-induced death, establishing the MANF-LIF-STAT3 axis as a survival regulator for primate astrocytes.
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Mesencephalic astrocyte-derived neurotrophic factor (MANF) is a non-canonical neurotrophic factor broadly expressed throughout the brain. Previous work has shown that MANF modulates neuronal functions in various disease contexts; however, its cell-type-specific roles within the brain remain incompletely understood. Notably, clinical data link MANF deficiency to microcephaly in humans, yet traditional rodent models fail to replicate this pathology.
To address this discrepancy, researchers investigated the role of MANF in the brain by comparing mice and monkeys. Using CRISPR/Cas9 gene editing, they knocked down MANF both in vivo and in primary cell cultures. By integrating molecular biology, transcriptome sequencing, and functional rescue experiments, the team discovered that MANF is essential for astrocyte survival specifically in monkeys.
Key findings from the study include:
- Primate-specific mechanism governing astrocyte survival. Acute MANF reduction produces distinct cellular consequences: while MANF depletion does not affect neuron or astrocyte survival in mice, it leads to astrocyte loss in monkeys. This finding aligns with previous observations that MANF knockout mice exhibit no overt neurological defects, whereas humans carrying MANF deletions show severe neurodevelopmental abnormalities and microcephaly. Together, these data uncover a previously unappreciated, primate-specific role of MANF in regulating astrocyte survival.
- The MANF-LIF-STAT3 Axis. The study identified the LIF-STAT3 pathway as a downstream effector of MANF in regulating monkey astrocyte survival, providing a mechanistic explanation for MANF’s primate-specific role in astrocyte maintenance. Furthermore, enhancing the LIF-STAT3 pathway mitigated the apoptotic signaling induced by MANF depletion, highlighting LIF as a promising therapeutic target for neurodevelopmental disorders in MANF-deficient individuals.
Collectively, this study underscores the significance of utilizing non-human primate models to investigate MANF neurobiology and to evaluate therapeutic strategies targeting MANF-related pathways. The work entitled “MANF is essential for astrocyte survival in the monkey brain” was published on Protein & Cell.
Journal
Protein & Cell
Method of Research
Experimental study
Subject of Research
Not applicable
Article Title
MANF is essential for astrocyte survival in the monkey brain
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