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Updated: May 3, 2026
06:12
Study of Dendritic Cell Development by Short Hairpin RNA-Mediated Gene Knockdown in a Hematopoietic Stem and Progenitor Cell Line In vitro
Published on: March 7, 2022
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Akt2- and ETS1-dependent IP3 receptor 2 expression in dendritic cell migration
Wenting Yang1, Meerim K Nurbaeva, Evi Schmid
1Department of Physiology, University of Tübingen, Tübingen, Germany.
Summary
The protein kinase Akt2 regulates dendritic cell (DC) migration by controlling calcium signaling pathways. Akt2 promotes DC migration by upregulating IP3R2 transcription via ETS1, impacting calcium release and entry.
Area of Science:
- Immunology
- Cell Biology
- Molecular Biology
Background:
- Akt2 (also known as PKBβ) is a protein kinase that regulates macrophage and dendritic cell (DC) migration.
- The precise mechanisms by which Akt2 influences DC migration have remained unclear.
- Dendritic cell migration is critically dependent on calcium (Ca2+) signaling.
Purpose of the Study:
- To investigate whether Akt2 plays a role in regulating Ca2+ signaling in DCs.
- To elucidate the molecular mechanisms linking Akt2 activity to DC migration.
Main Methods:
- Dendritic cells (DCs) were derived from Akt2-deficient (akt2(-/-)) and wild-type (akt2(+/+)) mice.
- DC maturation was induced by lipopolysaccharides (LPS).
- Calcium signaling, channel activity, gene expression (RT-PCR), and migration (transwell assays) were analyzed.
Main Results:
- Akt2-deficient DCs exhibited significantly impaired migration in response to CCL21 compared to wild-type DCs.
- CCL21-induced calcium influx, store-operated calcium entry (SOCE), and Ca2+ release-activated Ca2+ (CRAC) channel activity were reduced in Akt2-deficient DCs.
- Akt2 deficiency led to lower transcript and protein levels of IP3 receptor 2 (IP3R2) and its regulator ETS1, which were restored by Akt2.
- Inhibition of IP3 receptor or knockdown of ETS1 abrogated the migration differences between genotypes.
Conclusions:
- Akt2 is essential for CCL21-induced DC migration.
- Akt2 upregulates DC migration, at least partially, through the ETS1-dependent transcriptional control of IP3R2.
- This pathway significantly impacts calcium signaling, including SOCE and CRAC channel activity, thereby regulating DC migration.
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