Fine tuning of neuronal architecture requires two profilin isoforms

K Michaelsen, K Murk, M Zagrebelsky, A Dreznjak, BM Jockusch, M Rothkegel, M Korte

Research output: Contribution to journalArticle (Academic Journal)peer-review

57 Citations (Scopus)


Two profilin isoforms (PFN1 and PFN2a) are expressed in the mammalian brain. Although profilins are essential for regulating actin dynamics in general, the specific role of these isoforms in neurons has remained elusive. We show that knockdown of the neuron-specific PFN2a results in a significant reduction in dendrite complexity and spine numbers of hippocampal neurons. Overexpression of PFN1 in PFN2a-deficient neurons prevents the loss of spines but does not restore dendritic complexity. Furthermore, we show that profilins are involved in differentially regulating actin dynamics downstream of the pan-neurotrophin receptor (p75NTR), a receptor engaged in modulating neuronal morphology. Overexpression of PFN2a restores the morphological changes in dendrites caused by p75NTR overexpression, whereas PFN1 restores the normal spine density. Our data assign specific functions to the two PFN isoforms, possibly attributable to different affinities for potent effectors also involved in actin dynamics, and suggest that they are important for the signal-dependent fine-tuning of neuronal architecture.
Translated title of the contributionFine tuning of neuronal architecture requires two profilin isoforms
Original languageEnglish
Pages (from-to)15780 - 15785
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number36
Publication statusPublished - Sept 2010


Dive into the research topics of 'Fine tuning of neuronal architecture requires two profilin isoforms'. Together they form a unique fingerprint.

Cite this