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- Title
Macropinocytosis in Gracilariopsis lemaneiformis (Rhodophyta).
- Authors
Haihong Chen; Yiyi Hu; Guanpin Yang; Pingping Li; Jingru Yin; Xiaoqing Feng; Qiong Wu; Jingyu Zhang; Baoheng Xiao; Zhenghong Sui
- Abstract
Macropinocytosis is an endocytic process that plays an important role in animal development and disease occurrence but until now has been rarely reported in organisms with cell walls. We investigated the properties of endocytosis in a red alga, Gracilariopsis lemaneiformis. The cells non-selectively internalized extracellular fluid into large-scale endocytic vesicles (1.94 ± 0.51 mm), and this process could be inhibited by 5-(N-ethyl-N-isopropyl) amiloride, an macropinocytosis inhibitor. Moreover, endocytosis was driven by F-actin, which promotes formation of ruffles and cups from the cell surface and facilitates formation of endocytotic vesicles. After vesicle formation, endocytic vesicles could be acidified and acquire digestive function. These results indicated macropinocytosis in G. lemaneiformis. Abundant phosphatidylinositol kinase and small GTPase encoding genes were found in the genome of this alga, while PI3K, Ras, and Rab5, the important participators of traditional macropinocytosis, seem to be lacked. Such findings provide a new insight into endocytosis in organisms with cell walls and facilitate further research into the core regulatory mechanisms and evolution of macropinocytosis.
- Subjects
PINOCYTOSIS; RED algae; EXTRACELLULAR fluid; RAS oncogenes; ANIMAL development; ENDOCYTOSIS; GRACILARIA
- Publication
Frontiers in Plant Science, 2023, p1
- ISSN
1664-462X
- Publication type
Article
- DOI
10.3389/fpls.2023.1225675