Activation of multiple signaling pathways by terminal complement complexes involved in myocellular sodium homeostasis
| Autor: | Chikanori Terai, Weiyang Wang, Ken Okamoto, Danny O. Jacobs |
|---|---|
| Rok vydání: | 2004 |
| Předmět: |
MAPK/ERK pathway
Male Complement Membrane Attack Complex Biology General Biochemistry Genetics and Molecular Biology Rats Sprague-Dawley Animals Protein kinase A Muscle Skeletal Protein kinase C Protein Kinase C Glycoproteins Hemostasis Muscle Cells L-Lactate Dehydrogenase Sodium Zymosan General Medicine Complement System Proteins Complement system Cell biology Rats Intracellular signal transduction Biochemistry Potassium Signal transduction Mitogen-Activated Protein Kinases Complement membrane attack complex Intracellular Signal Transduction |
| Zdroj: | The Tohoku journal of experimental medicine. 202(2) |
| ISSN: | 0040-8727 |
| Popis: | Soluble C5b-9 complexes (SC5b-9), hemolytically inactive end-products of complement activation have long been considered to be irrelevant. Recent investigations, however, have demonstrated that SC5b-9 induces numerous biological effects via a series of intracellular signal transduction events. We have previously demonstrated that SC5b-9 enriched sera increased intracellular Na+ in rat skeletal muscles. This study was purposed to determine if the protein kinase C (PKC) or mitogen-activated protein kinase (MAPK) signaling pathway mediates the effects of SC5b-9. Fast-twitch extensor digitorum longus (EDL) muscles isolated from infant rats were incubated at 30 degrees C for 60 minutes with 10% zymosan-activated rat sera (ZARS) as a source of complement. Heat-inactivated rat sera (HIRS) were used as a control. The muscles were also incubated with ZARS or HIRS in the presence of specific inhibitors against PKC (GF109203X) or MAPK (PD98059 and SB202190). Intracellular Na+ and K+ contents were then measured. ZARS significantly increased intracellular Na+ and the Na+/K+ ratio in EDL muscles as compared to HIRS. GF109203X, PD98059 and SB202190 markedly attenuated increase in myocellular Na+ induced by ZARS, respectively. We concluded that SC5b-9 enriched sera alter myocellular Na+ homeostasis, at least in part, via the mechanisms linked to PKC and MAPK signal transduction pathways. |
| Databáze: | OpenAIRE |
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