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Continuous interleukin‐6 application in vivo via macroencapsulation of interleukin‐6–expressing COS‐7 cells induces massive gliosis
Author(s) -
Tilgner Johannes,
Volk Benedikt,
Kaltschmidt Christian
Publication year - 2001
Publication title -
glia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.954
H-Index - 164
eISSN - 1098-1136
pISSN - 0894-1491
DOI - 10.1002/glia.1088
Subject(s) - astrocytosis , gliosis , microglia , in vivo , biology , cytokine , interleukin , neuroglia , transfection , immune system , microbiology and biotechnology , immunology , pathology , cell culture , inflammation , neuroscience , medicine , central nervous system , immunohistochemistry , genetics
The inflammatory cytokine interleukin‐6 (IL‐6) was found in senile plaques of Alzheimer's patients and might be involved in the pathology of Parkinson's disease and multiple sclerosis. Interestingly, an astocytosis is also found in these neurodegenerative disorders. To evaluate the direct effects of IL‐6 in vivo on glial cells, we created a new in vivo model. IL‐6 and mock‐transfected (control group) COS‐7 cells were encapsulated in a poly‐acryl‐nitril membrane for implantation into the rat striatum. Afterward, the host immune reaction to the membrane without encapsulated cells and the biological action of IL‐6–producing capsules was evaluated. Animals with an implanted membrane without cells showed a moderate astrocytosis 5 days after the operation. Furthermore, microglia and T‐cells could be detected and after 30 days the astrocytosis decreased to a small layer around the membrane. In comparison to the control group, which received a sham operation, our results demonstrate that the response of glial cells is caused by the mechanical damage of the surgical procedure itself rather than due to the introduced membrane material. In contrast, we found a massive proliferation and activation of astrocytes and microglia after 10 days by IL‐6–secreting capsules, indicating that IL‐6 is involved in the induction of gliosis. Control animals that received encapsulated mock‐transfected COS‐7 cells showed only a weak response. These data point to an involvement of IL‐6 in the proliferation and activation of glial cells as seen in neurodegenerative disorders. GLIA 35:234–245, 2001. © 2001 Wiley‐Liss, Inc.