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Cell division is essential for organismal growth and development. In animal cells, the central spindle and its associated proteins form the midbody, a structure that has an essential role in cytokinesis. In plants, the central spindle, along with the microtubules, actin, and other cell components, matures into the phragmoplast, which is necessary for cytokinesis. Unlike the stationary midbody, the phragmoplast expands centrifugally, eventually leading to the formation of the new cell wall.
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"Phagosome Closure Assay" to Visualize Phagosome Formation in Three Dimensions Using Total Internal Reflection Fluorescent Microscopy TIRFM
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PALLD Regulates Phagocytosis by Enabling Timely Actin Polymerization and Depolymerization.

Hai-Min Sun1, Xin-Lei Chen1, Xin-Jie Chen1

  • 1State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, RuiJin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China.

Journal of Immunology (Baltimore, Md. : 1950)
|July 26, 2017
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Summary
This summary is machine-generated.

Palladin (PALLD) promotes phagocytosis by regulating actin dynamics during cellular immune responses. This actin cross-linker is crucial for immune cell maturation and efficient particle engulfment.

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Area of Science:

  • Cell Biology
  • Immunology
  • Biochemistry

Background:

  • Palladin (PALLD) is known as an actin cross-linker involved in cellular mechanical tension.
  • The role of PALLD in phagocytosis, a key process in innate immunity and tissue repair, remains largely unknown.

Purpose of the Study:

  • To investigate the function of PALLD in the regulation of phagocytosis.
  • To elucidate the molecular mechanisms by which PALLD influences phagocytic processes.

Main Methods:

  • Studied PALLD expression during all-trans-retinoic acid-induced myeloid leukemia cell maturation.
  • Analyzed the impact of PALLD on Ig- or complement-opsonized phagocytosis.
  • Investigated PALLD's role in actin polymerization, c-Src activation, and recruitment of oculocerebrorenal syndrome of Lowe phosphatase.

Main Results:

  • PALLD expression is significantly upregulated during myeloid leukemia cell maturation.
  • PALLD enhances phagocytosis by promoting phagocytic receptor clustering through regulation of actin polymerization and c-Src activation.
  • PALLD facilitates nascent phagosome maturation by recruiting oculocerebrorenal syndrome of Lowe phosphatase, regulating actin depolymerization.

Conclusions:

  • Palladin (PALLD) is a novel and critical regulator of the early stages of phagocytosis.
  • PALLD orchestrates dynamic actin polymerization and depolymerization essential for efficient phagosome formation and closure.