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Possible involvement of microfilaments in protein kinase C translocation
Abstract:
We investigated the role of microfilaments in stimulus-induced translocation of protein kinase C (PKC) in polymorphonuclear leukocytes (PMNs) from C57BL/6 mice. Cytochalasin B and dihydrocytochalasin B almost completely inhibited PKC translocation induced by either TPA or Ca2+ ionophore after pretreatment of cells for 30 min. In addition, ML-9, a potent inhibitor of Ca2+/calmodulin-dependent myosin light chain kinase which regulate microfilament contraction, and a calmodulin antagonist W-7, also inhibited PKC translocation. These findings suggest the possibility that microfilaments are involved in the translocation of PKC.
Insights
Microfilaments play a key role in the movement of protein kinase C (PKC) within immune cells. Inhibiting microfilament activity blocked PKC translocation, suggesting microfilaments are essential for this process.
Area of Science:
- Immunology
- Cell Biology
- Biochemistry
Background:
- Protein kinase C (PKC) is crucial in cellular signaling pathways.
- The translocation of PKC within cells is a key regulatory step.
- Polymorphonuclear leukocytes (PMNs) are important immune cells involved in inflammatory responses.
Purpose of the Study:
- To investigate the role of microfilaments in stimulus-induced translocation of protein kinase C (PKC).
- To determine if inhibiting microfilament contraction affects PKC translocation in PMNs.
Main Methods:
- Utilized C57BL/6 mouse polymorphonuclear leukocytes (PMNs).
- Administered TPA or Ca2+ ionophore to induce PKC translocation.
- Pretreated cells with microfilament inhibitors (Cytochalasin B, dihydrocytochalasin B), a myosin light chain kinase inhibitor (ML-9), and a calmodulin antagonist (W-7).
Main Results:
- Cytochalasin B and dihydrocytochalasin B significantly inhibited TPA- or Ca2+ ionophore-induced PKC translocation.
- ML-9 and W-7 also demonstrated inhibition of PKC translocation.
- These results indicate a dependency of PKC translocation on microfilament function.
Conclusions:
- Microfilaments are involved in the stimulus-induced translocation of protein kinase C (PKC) in PMNs.
- The findings suggest that microfilament contraction is a necessary component for PKC movement within these immune cells.