Postnatal expression of interleukin-6 (IL-6) and IL-6 receptor (IL-6R) mRNAs in rat sympathetic and sensory ganglia.
The postnatal expression of interleukin-6 (IL-6) and IL-6 receptor (IL-6R) mRNAs in superior cervical ganglia (SCG) and dorsal root ganglia (DRG) of normal rats were studied by using RT-PCR. IL-6 and IL-6R transcripts were found in both these peripheral nervous system (PNS) tissues and their expression was differentially regulated. In sensory ganglia, a strong upregulation (12-fold) of the IL-6R mRNA occurred between postnatal day 2 and day 20, staying at this elevated level until adulthood (day 70). During the same period the IL-6 mRNA increased to a lesser extent (3-fold). In SCG, both transcripts undergo only a minor induction (2-fold) during postnatal development. To identify the cellular source of IL-6 and its receptor mRNAs in both PNS tissues, a sensitive non-radioactive in situ hybridization technique was used. Both mRNAs could be localized predominantly in the neuronal cell bodies in the sympathetic and sensory ganglia. In addition, IL-6R mRNA positive cells were found located along the axon outside the DRG, and are likely to be Schwann cells. The same cells were negative for IL-6 mRNA. These findings support the concept of IL-6 as a regulator of neuronal survival and differentiation in the central and peripheral nervous system.
Gadient
R A
RA
Department of Physiology, University of Basel, Switzerland.
Otten
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D000367:Age Factors; D000818:Animals; D018076:DNA, Complementary / Q000235:genetics; D005260:Female; D005727:Ganglia, Spinal / Q000502:physiology*; D005728:Ganglia, Sympathetic / Q000502:physiology; D005786:Gene Expression Regulation / Q000502:physiology; D017403:In Situ Hybridization; D015850:Interleukin-6 / Q000235:genetics*; D008297:Male; D016133:Polymerase Chain Reaction; D012333:RNA, Messenger / Q000378:metabolism; D051381:Rats; D011919:Rats, Inbred Strains; D018123:Receptors, Interleukin / Q000235:genetics*; D017783:Superior Cervical Ganglion / Q000502:physiology*
D018076:DNA, Complementary; D015850:Interleukin-6; D012333:RNA, Messenger; D018123:Receptors, Interleukin