9 research outputs found
Decreased demand for olfactory periglomerular cells impacts on neural precursor cell viability in the rostral migratory stream
The subventricular zone (SVZ) provides a constant supply of new neurons to the
olfactory bulb (OB). Different studies have investigated the role of olfactory
sensory input to neural precursor cell (NPC) turnover in the SVZ but it was
not addressed if a reduced demand specifically for periglomerular neurons
impacts on NPC-traits in the rostral migratory stream (RMS). We here report
that membrane type-1 matrix metalloproteinase (MT1-MMP) deficient mice have
reduced complexity of the nasal turbinates, decreased sensory innervation of
the OB, reduced numbers of olfactory glomeruli and reduced OB-size without
alterations in SVZ neurogenesis. Large parts of the RMS were fully preserved
in MT1-MMP-deficient mice, but we detected an increase in cell death-levels
and a decrease in SVZ-derived neuroblasts in the distal RMS, as compared to
controls. BrdU-tracking experiments showed that homing of NPCs specifically to
the glomerular layer was reduced in MT1-MMP-deficient mice in contrast to
controls while numbers of tracked cells remained equal in other OB-layers
throughout all experimental groups. Altogether, our data show the demand for
olfactory interneurons in the glomerular layer modulates cell turnover in the
RMS, but has no impact on subventricular neurogenesis
Wirtschaftliche Integration in Asien und Europa: die Rolle Japans und der Bundesrepublik Deutschland
Available from Bibliothek des Instituts fuer Weltwirtschaft, ZBW, Duesternbrook Weg 120, D-24105 Kiel W 278 (220) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman
Membrane-type 1 metalloproteinase is upregulated in microglia/brain macrophages in neurodegenerative and neuroinflammatory diseases
We previously reported that glioma cells induce the expression of membrane-type 1 metalloproteinase (MT1-MMP or MMP-14) in tumor-associated microglia/macrophages and promote tumor growth, whereas MMP-14 expression in microglia under physiological conditions is very low. Here, we show that the increase in MMP-14 expression is also found in microglia/macrophages associated with neurodegenerative and neuroinflammatory pathologies in mouse models as well as in human biopsies or post-mortem tissue. We found that microglial/macrophage MMP-14 expression was upregulated in Alzheimer's disease tissue, in active lesions of multiple sclerosis, and in tissue from stage II stroke as well as in the corresponding mouse models for the human diseases. In contrast, we observed no upregulation for MMP-14 in microglia/macrophages in the early phase of stroke or in the corresponding mouse model, in human amyotrophic lateral sclerosis (ALS) tissue or in a mouse model of ALS as well as in human cases of acute brain trauma. These data indicate that MMP-14 expression is not a general marker for activated microglia/macrophages but is upregulated in defined stages of neuroinflammatory and neurodegenerative diseases and that there is generally a good match between mouse models and human brain pathologies