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Glutamate carboxypeptidase II is expressed by astrocytes in the adult rat nervous system
Author(s) -
Berger Urs V.,
LuthiCarter Ruth,
Passani Lucius A.,
Elkabes Stella,
Black Ira,
Konradi Christine,
Coyle Joseph T.
Publication year - 1999
Publication title -
journal of comparative neurology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.855
H-Index - 209
eISSN - 1096-9861
pISSN - 0021-9967
DOI - 10.1002/(sici)1096-9861(19991206)415:1<52::aid-cne4>3.0.co;2-k
Subject(s) - biology , astrocyte , neuroglia , glutamate receptor , central nervous system , microbiology and biotechnology , biochemistry , cerebellum , nervous system , neuropeptide , in situ hybridization , glutamate carboxypeptidase ii , endocrinology , gene expression , neuroscience , receptor , prostate , genetics , cancer , gene
The enzyme glutamate carboxypeptidase II (GCP II) has been cloned from rat brain and human prostate. This enzyme, which catabolizes the neuropeptide N ‐acetylaspartylglutamate, has also been known as N ‐acetylated α‐linked acidic dipeptidase (NAALADase), and is identical to the prostate‐specific membrane antigen and to the jejunal folylpoly‐γ‐glutamate carboxypeptidase. The goals of the present study were to elucidate the cell specificity and regional pattern of GCP II expression in the rat nervous system by using Northern blots and enzymatic assays of brain and subfractionated primary neuronal and glial cultures together with in situ hybridization histochemistry (ISHH) in sections of adult rat tissue. GCP II activity was assayed in astrocyte cultures (4.4 pmol/mg protein per minute), neuronal‐glial cocultures (2.5 pmol/mg protein per minute) and neuron‐enriched cultures (0.38 pmol/mg protein per minute), with the activity in each preparation correlating to its astrocytic content ( r = 0.99). No activity was detected in cultured oligodendrocytes or microglia. Northern blots probed with a GCP II cDNA detected mRNAs exclusively in activity‐positive cell preparations. ISHH results show that GCP II is expressed by virtually all astrocytes, by Bergmann glial cells in cerebellum, by Müller cells in retina and by the satellite cells in dorsal root ganglia. Astrocytes in select groups of nuclei (e.g., habenula, supraoptic nucleus, pontine nucleus) contained pronounced levels of GCP II message. The data of the present study suggest that GCP II is expressed in the adult rat nervous system exclusively in astrocytic glial cells. J. Comp. Neurol. 415:52–64, 1999. © 1999 Wiley‐Liss, Inc.