p53 Related Protein Kinase is Required for Arp2/3-Dependent Actin Dynamics of Hemocytes in Drosophila melanogaster.

Molina, Emiliano; Cataldo, Vicente F; Eggers, Cristián; Muñoz-Madrid, Valentina; Glavic, Álvaro (2022). p53 Related Protein Kinase is Required for Arp2/3-Dependent Actin Dynamics of Hemocytes in Drosophila melanogaster. Frontiers in cell and developmental biology, 10, p. 859105. Frontiers 10.3389/fcell.2022.859105

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Cells extend membrane protrusions like lamellipodia and filopodia from the leading edge to sense, to move and to form new contacts. The Arp2/3 complex sustains lamellipodia formation, and in conjunction with the actomyosin contractile system, provides mechanical strength to the cell. Drosophila p53-related protein kinase (Prpk), a Tsc5p ortholog, has been described as essential for cell growth and proliferation. In addition, Prpk interacts with proteins associated to actin filament dynamics such as α-spectrin and the Arp2/3 complex subunit Arpc4. Here, we investigated the role of Prpk in cell shape changes, specifically regarding actin filament dynamics and membrane protrusion formation. We found that reductions in Prpk alter cell shape and the structure of lamellipodia, mimicking the phenotypes evoked by Arp2/3 complex deficiencies. Prpk co-localize and co-immunoprecipitates with the Arp2/3 complex subunit Arpc1 and with the small GTPase Rab35. Importantly, expression of Rab35, known by its ability to recruit upstream regulators of the Arp2/3 complex, could rescue the Prpk knockdown phenotypes. Finally, we evaluated the requirement of Prpk in different developmental contexts, where it was shown to be essential for correct Arp2/3 complex distribution and actin dynamics required for hemocytes migration, recruitment, and phagocytosis during immune response.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Department of Chemistry, Biochemistry and Pharmaceutical Sciences (DCBP)

UniBE Contributor:

Eggers Aracena, Cristian Eduardo

Subjects:

500 Science > 570 Life sciences; biology
500 Science > 540 Chemistry

ISSN:

2296-634X

Publisher:

Frontiers

Language:

English

Submitter:

Pubmed Import

Date Deposited:

22 Jun 2022 15:56

Last Modified:

26 Jun 2022 01:52

Publisher DOI:

10.3389/fcell.2022.859105

PubMed ID:

35721516

Uncontrolled Keywords:

ARP2/3 PRPK Rab35 actin dynamics cell migration immune response

BORIS DOI:

10.48350/170816

URI:

https://boris.unibe.ch/id/eprint/170816

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