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Expression and localization of Inter-alpha Inhibitors in rodent brain.

X Chen¹, L Rivard¹, S Naqvi¹

¹Department of Pediatrics, the Alpert Medical School of Brown University, Women & Infants Hospital of Rhode Island, Providence, RI, United States.

|March 12, 2016

Summary

Inter-alpha Inhibitor Proteins (IAIPs) are found in the central nervous system (CNS) and protect against neuronal damage. This study shows IAIPs are expressed in various CNS cells, suggesting a role in neuroprotection and immune response.

Keywords:

Inter-alpha Inhibitors cell culture fetal neonate neurons rodent

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Area of Science:

Neuroscience
Immunology
Biochemistry

Background:

Inter-alpha Inhibitor Proteins (IAIPs) are serine protease inhibitors crucial for systemic innate immunity.
Endogenous IAIPs have been identified in the developing CNS and demonstrated neuroprotective effects in neonatal rats post-injury.
The presence and function of IAIPs within the CNS suggest a role in the central innate immune system.

Purpose of the Study:

To characterize the expression and localization of Inter-alpha Inhibitor Proteins (IAIPs) within the central nervous system (CNS).

Main Methods:

In vitro studies using cultured mouse cortical neurons, rat neurons, microglia, and astrocytes.
In vivo studies utilizing immunohistochemistry on brain sections from embryonic (E) day 18 mice and postnatal (P) day 10 rats.
Analysis of mRNA transcripts for IAIP light and heavy chain genes (Ambp, Itih-1-5) and detection of IAIP proteins.

Main Results:

Cultured neurons expressed mRNA transcripts for IAIP light chain (Ambp) and heavy chains (Itih-1-5).
IAIP proteins were detected in cultured cells and in vivo brain sections (E18 mice, P10 rats).
Immunoreactivity for IAIPs was observed in neurons, microglia, astrocytes, oligodendroglia, ependyma, and choroid plexus across multiple brain regions.

Conclusions:

Inter-alpha Inhibitor Proteins (IAIPs) are endogenous proteins expressed across diverse cell types and regions within the rodent CNS, both in vitro and in vivo.
These findings support the hypothesis that IAIPs function as endogenous neuroprotective and immunomodulatory proteins within the CNS.
Endogenous IAIPs may play a significant role in the central nervous system's innate immune defenses and neuroprotective mechanisms.