In:
Journal of Pineal Research, Wiley, Vol. 64, No. 4 ( 2018-05)
Abstract:
Through activation of the ERK pathway, nicotine, in both normal MCF ‐10A and low‐malignant breast cancer cells ( MCF 7), promotes increased motility and invasiveness. Melatonin antagonizes both these effects by inhibiting almost completely ERK phosphorylation. As melatonin has no effect on nonstimulated cells, it is likely that melatonin can counteract ERK activation only downstream of nicotine‐induced activation. This finding suggests that melatonin hampers ERK phosphorylation presumably by targeting a still unknown intermediate factor that connects nicotine stimulation to ERK phosphorylation. Furthermore, downstream of ERK activation, melatonin significantly reduces fascin and calpain activation while restoring normal vinculin levels. Melatonin also counteracts nicotine effects by reshaping the overall cytoskeleton architecture and abolishing invasive membrane protrusion. In addition, melatonin decreases nicotine‐dependent ROCK 1/ ROCK 2 activation, thus further inhibiting cell contractility and motility. Melatonin actions are most likely attributable to ERK inhibition, although melatonin could display other ERK ‐independent effects, namely through a direct modulation of additional molecular and structural factors, including coronin, cofilin, and cytoskeleton components.
Type of Medium:
Online Resource
ISSN:
0742-3098
,
1600-079X
DOI:
10.1111/jpi.2018.64.issue-4
Language:
English
Publisher:
Wiley
Publication Date:
2018
detail.hit.zdb_id:
2027992-9
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