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Osteopontin enhances endogenous repair after neonatal hypoxic-ischemic brain injury
Cindy T J van Velthoven1, Cobi J Heijnen, Frank van Bel
1Laboratory for Neuroimmunology and Developmental Origins of Disease, University Medical Center Utrecht, Utrecht, The Netherlands.
Insights
Osteopontin (OPN) is crucial for brain repair after neonatal hypoxic-ischemic (HI) injury. OPN deficiency worsens brain damage and sensorimotor deficits, highlighting its therapeutic potential for white matter injury.
Area of Science:
- Neuroscience
- Developmental Biology
- Molecular Biology
Background:
- Neonatal hypoxic-ischemic (HI) brain injury is a significant cause of perinatal complications.
- Current therapeutic options for HI brain injury are limited.
- Identifying key molecular players in HI brain damage and repair is critical.
Purpose of the Study:
- To investigate the gene expression profile of growth factors after neonatal cerebral HI.
- To identify osteopontin (OPN) as a key upregulated factor.
- To explore the role of endogenous OPN in neonatal HI brain damage and repair.
Main Methods:
- Gene expression profiling of 150 growth factor-related genes using RT-PCR arrays in mice post-HI.
- Comparison of brain damage, sensorimotor function, and cell proliferation/differentiation in OPN-deficient and wild-type mice after HI.
- Analysis of cell proliferation, survival, and oligodendrocyte differentiation.
Main Results:
- Osteopontin (OPN) showed the most significant upregulation post-HI.
- OPN-deficient mice exhibited increased gray and white matter loss and sensorimotor deficits compared to controls.
- OPN deficiency reduced HI-induced cell proliferation/survival and oligodendrogenesis, without impacting neuronal differentiation.
Conclusions:
- Osteopontin (OPN) plays a vital role in brain repair following neonatal HI.
- OPN regulates cerebral cell proliferation, survival, and oligodendrocyte differentiation post-injury.
- OPN's promyelinative effects suggest potential therapeutic strategies for white matter injury.
Background And Purpose:
Hypoxic-ischemic (HI) brain injury is a frequent cause of perinatal morbidity and mortality with limited therapeutic options. To identify molecules important for cerebral damage and repair, we investigated the growth factor-related gene expression profile after neonatal cerebral HI. We identified osteopontin (OPN) as the most highly upregulated factor early after HI. We therefore explored the role of endogenous OPN in brain damage and repair.
Methods:
Nine-day-old wild-type mice were exposed to cerebral HI; growth factor-related gene expression profiles were analyzed 1 to 7 days later by reverse transcriptase-polymerase chain reaction arrays. To determine the contribution of OPN to brain damage, we used p9 OPN(-/-) and wild-type mice. HI brain damage, sensorimotor function, and cell proliferation and differentiation were compared.
Results:
Gene expression profiling of 150 genes related to growth factors and neurotrophins showed that expression of 52 genes changed during the first 7 days after HI. OPN was the gene with the strongest increase expression at all time points measured. We show here for the first time that in response to neonatal HI, OPN-deficient mice developed increased gray and white matter loss and more pronounced sensorimotor deficits as compared with wild-type littermates. Furthermore, OPN deficiency decreases HI-induced cell proliferation/survival and oligodendrogenesis without affecting neuronal differentiation.
Conclusions:
OPN plays an important role in repairing brain injury after neonatal HI by regulating cerebral cell proliferation/survival and oligodendrocyte differentiation after injury. The observed promyelinative effect of OPN may offer novel possibilities for a therapy targeting white matter injury.
