Actin and myosin regulate cytoplasm stiffness in plant cells: a study using optical tweezers

Research output: Contribution to journalArticleAcademicpeer-review

24 Citations (Scopus)

Abstract

Here, we produced cytoplasmic protrusions with optical tweezers in mature BY-2 suspension cultured cells to study the parameters involved in the movement of actin filaments during changes in cytoplasmic organization and to determine whether stiffness is an actin-related property of plant cytoplasm. Optical tweezers were used to create cytoplasmic protrusions resembling cytoplasmic strands. Simultaneously, the behavior of the actin cytoskeleton was imaged. After actin filament depolymerization, less force was needed to create cytoplasmic protrusions. During treatment with the myosin ATPase inhibitor 2,3-butanedione monoxime, more trapping force was needed to create and maintain cytoplasmic protrusions. Thus, the presence of actin filaments and, even more so, the deactivation of a 2,3-butanedione monoxime-sensitive factor, probably myosin, stiffens the cytoplasm. During 2,3-butanedione monoxime treatment, none of the tweezer-formed protrusions contained filamentous actin, showing that a 2,3-butanedione monoxime-sensitive factor, probably myosin, is responsible for the movement of actin filaments, and implying that myosin serves as a static cross-linker of actin filaments when its motor function is inhibited. The presence of actin filaments does not delay the collapse of cytoplasmic protrusions after tweezer release. Myosin-based reorganization of the existing actin cytoskeleton could be the basis for new cytoplasmic strand formation, and thus the production of an organized cytoarchitecture
Original languageEnglish
Pages (from-to)90-102
JournalNew Phytologist
Volume185
Issue number1
DOIs
Publication statusPublished - 2010

Keywords

  • tobacco by-2 cells
  • stamen hair-cells
  • 2,3-butanedione monoxime
  • f-actin
  • transvacuolar strands
  • cultured-cells
  • cytoskeleton
  • organization
  • manipulation
  • microtubules

Fingerprint

Dive into the research topics of 'Actin and myosin regulate cytoplasm stiffness in plant cells: a study using optical tweezers'. Together they form a unique fingerprint.

Cite this