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In JoVE (1)
Other Publications (2)
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Articles by John D. Chan in JoVE
Farmakolojik ve Fonksiyonel Genetik Tahliller Planarian Rejenerasyon işleyin
John D. Chan, Jonathan S. Marchant
Department of Pharmacology and The Stem Cell Institute, University of Minnesota Medical School
, Canlı hayvan içinde kök hücre farklılaşması çalışmak için cazip bir model planarian flatworm. Yenileme, temel laboratuvar kolayca yapılır basit amputasyon deneyleri ile çalışılmış ve farmakolojik ve genetik (uygun
Other articles by John D. Chan on PubMed
A Novel Biological Activity of Praziquantel Requiring Voltage-operated Ca2+ Channel Beta Subunits: Subversion of Flatworm Regenerative Polarity
PLoS Neglected Tropical Diseases. 2009 | Pubmed ID: 19554083
Approximately 200 million people worldwide harbour parasitic flatworm infections that cause schistosomiasis. A single drug-praziquantel (PZQ)-has served as the mainstay pharmacotherapy for schistosome infections since the 1980s. However, the relevant in vivo target(s) of praziquantel remain undefined.
The Journal of Neuroscience : the Official Journal of the Society for Neuroscience. Nov, 2011 | Pubmed ID: 22049441
There is intense interest in developing methods to regulate proliferation and differentiation of stem cells into neuronal fates for the purposes of regenerative medicine. One way to do this is through in vivo pharmacological engineering using small molecules. However, a key challenge is identification of relevant signaling pathways and therein druggable targets to manipulate stem cell behavior efficiently in vivo. Here, we use the planarian flatworm as a simple chemical-genetic screening model for nervous system regeneration to show that the isoquinoline drug praziquantel (PZQ) acts as a small molecule neurogenic to produce two-headed animals with integrated CNSs following regeneration. Characterization of the entire family of planarian voltage-operated Ca(2+) channel α subunits (Ca(v)α), followed by in vivo RNAi of specific Ca(v) subunits, revealed that PZQ subverted regeneration by activation of a specific voltage-gated Ca(2+) channel isoform (Ca(v)1A). PZQ-evoked Ca(2+) entry via Ca(v)1A served to inhibit neuronally derived Hedgehog signals, as evidenced by data showing that RNAi of Ca(v)1A prevented PZQ-evoked bipolarity, Ca(2+) entry, and decreases in wnt1 and wnt11-5 levels. Surprisingly, the action of PZQ was opposed by Ca(2+) influx through a closely related neuronal Ca(v) isoform (Ca(v)1B), establishing a novel interplay between specific Ca(v)1 channel isoforms, Ca(2+) entry, and neuronal Hedgehog signaling. These data map PZQ efficacy to specific neuronal Ca(v) complexes in vivo and underscore that both activators (Ca(v)1A) and inhibitors (Ca(v)1B) of Ca(2+) influx can act as small molecule neurogenics in vivo on account of the unique coupling of Ca(2+) channels to neuronally derived polarity cues.