Evolution of GLUD2 Glutamate Dehydrogenase Allows Expression in Human Cortical Neurons.

Abstract:

:Human hGDH2 arose via duplication in the apes and driven by positive selection acquired enhanced catalytic ability under conditions inhibitory to its precursor hGDH1 (common to all mammals). To explore the biological advantage provided by the novel enzyme, we studied, by immunohistochemistry (IHC) and immunofluorescence (IF), hGDH1 and hGDH2 expression in the human brain. Studies on human cortical tissue using anti-hGDH1-specific antibody revealed that hGDH1 was expressed in glial cells (astrocytes, oligodendrocytes, and oligodendrocyte precursors) with neurons being devoid of hGDH1 staining. In contrast, an hGDH2-specific antiserum labeled both astrocytes and neurons. Specifically, hGDH2 immunoreactivity was found in the cytoplasm of large neuronal cells within coarse structures resembling mitochondria. These were distributed either in the perikaryon or in the cell periphery. Double immunofluorescence (IF) suggested that the latter represented hGDH2-labeled mitochondria of presynaptic nerve terminals. Hence, hGDH2 evolution bestowed large human neurons with enhanced glutamate metabolizing capacity, thus strengthening cortical excitatory transmission.

journal_name

Mol Neurobiol

journal_title

Molecular neurobiology

authors

Spanaki C,Kotzamani D,Kleopa K,Plaitakis A

doi

10.1007/s12035-015-9429-2

subject

Has Abstract

pub_date

2016-10-01 00:00:00

pages

5140-8

issue

8

eissn

0893-7648

issn

1559-1182

pii

10.1007/s12035-015-9429-2

journal_volume

53

pub_type

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