[en] Using in vitro techniques, we looked for a possible downregulation of rat astroglia proliferation by neuronal cells. We demonstrate that medium conditioned by 7-day-old rat cerebellar granule neurons or by 16-day-old rat embryo hippocampal neurons strongly inhibits the proliferation of cultured astroglial cells. Two neuronal cell lines, the PC12 rat pheocromocytoma and the neuro 2A (N2A) murine neuroblastoma also release such an activity. This release in N2A-conditioned medium (CM) occurs when the cells are at high density and show a low proliferation rate. This activity is present in media conditioned by neuronal cells, but not in media conditioned by normal astrocytes, by two glioma cell lines, or by one fibroblastic cell line. This proliferation inhibitor addresses normal astrocytes: the proliferation of two glioma cell lines, of a fibroblastic cell line, and of the two neuronal cell lines (PC12, N2A) is not inhibited by N2A CM. Moreover, this activity is directed against type 1 astrocytes, but not against type 2. Using three different assays, we demonstrate that DNA synthesis by astroglial cells is inhibited. N2A CM has no cytotoxic effect on astrocytes and does not modify their overall protein synthesis. Using affinity and gel filtration chromatography, we show that this activity is associated with a protein whose molecular weight ranges between 15 and 20 kDa. The possible relationship between this N2A cell-derived astroglia proliferation inhibitor and other types of potential glial proliferation inhibitors has been investigated. A brain glycoprotein immunologically related to epidermal growth factor receptor (EGFR) was reported to inhibit astroglial cell proliferation in vitro. Using polyclonal and monoclonal antibodies against EGFR, we were unable to immunoprecipitate the astrocyte proliferation inhibitor in N2A CM or to demonstrate by immunoblotting the presence of an EGFR-like immunoreactivity in the N2A CM or in the active chromatographic fractions of N2A CM. Transforming growth factor beta (TGF beta) is a well-known modulator of the proliferation of various cell types and was shown to be present in N2A CM. Using a polyclonal anti-TGF beta antibody that recognizes TGF beta on Western blots of N2A CM, we were unable to immunoprecipitate the astrocyte proliferation inhibitor of N2A CM. It seems thus far that the neuronal astroglia proliferation inhibitor is a new protein for which we propose the name astrostatine.
Disciplines :
Neurology
Author, co-author :
Rogister, Bernard ; Centre Hospitalier Universitaire de Liège - CHU > Neurologie Sart Tilman
Leprince, Pierre ; Université de Liège - ULiège > GIGA - Neurosciences
Bonhomme, Vincent ; Centre Hospitalier Universitaire de Liège - CHU > Anesthésie et réanimation
Rigo, J. M.
Delree, P.
Colige, Alain ; Université de Liège - ULiège > Département des sciences biomédicales et précliniques > Laboratoire de Biologie des tissus conjonctifs
Moonen, Gustave ; Centre Hospitalier Universitaire de Liège - CHU > Neurologie Sart Tilman
Language :
English
Title :
Cultured neurons release an inhibitor of astroglia proliferation (astrostatine).
Publication date :
1990
Journal title :
Journal of Neuroscience Research
ISSN :
0360-4012
eISSN :
1097-4547
Publisher :
Wiley Interscience, New York, United States - New York
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