28.05.2013 Views

Brochure Seminario di Primavera 2005 - Fondazione Ricerca ...

Brochure Seminario di Primavera 2005 - Fondazione Ricerca ...

Brochure Seminario di Primavera 2005 - Fondazione Ricerca ...

SHOW MORE
SHOW LESS

Create successful ePaper yourself

Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.

William B. Guggino<br />

Johns Hopkins University School<br />

of Me<strong>di</strong>cine, Baltimore, USA<br />

Il Dr William Guggino è professore <strong>di</strong> Fisiologia e<br />

Pe<strong>di</strong>atria presso la Johns Hopkins School of<br />

Me<strong>di</strong>cine <strong>di</strong> Baltimora. Egli ha rivestito e riveste<br />

parecchi incarichi <strong>di</strong> <strong>di</strong>rezione <strong>di</strong> ricerca, tra cui:<br />

Centro <strong>di</strong> Terapia Genica della Fibrosi Cistica presso<br />

l’NIH, Centro Specializzato <strong>di</strong> <strong>Ricerca</strong> per la Fibrosi<br />

Cistica sempre al NIH, vice <strong>di</strong>rettore <strong>di</strong> Ricerche in<br />

Pe<strong>di</strong>atria presso la J. Hopkins University School <strong>di</strong><br />

Baltimora.Grande esperto nelle tecniche <strong>di</strong> biologia<br />

molecolare, i suoi interessi <strong>di</strong> ricerca più recenti<br />

riguardano: <strong>di</strong>agnosi, patogenesi e trattamento delle<br />

malattie genetiche nei bambini; ruolo della CFTR<br />

nello sviluppo dei polmoni e funzionamento dei<br />

canali del cloro; meccanismi <strong>di</strong> trasporto tubulare<br />

renale, con particolare interesse per le interazioni<br />

proteiche nella secrezione <strong>di</strong> flui<strong>di</strong>; interazione tra<br />

proteina CFTR ed altre proteine nella maturazione e<br />

funzionamento <strong>di</strong> CFTR; nuovi approcci farmacologici<br />

per mo<strong>di</strong>ficare l’espressione e la maturazione <strong>di</strong><br />

CFTR; biologia molecolare della CF in generale; trial<br />

clinico con duramicina.<br />

10<br />

DIFETTO DI BASE<br />

Acquisizioni sulla macchina<br />

secretiva epiteliale<br />

e prospettive <strong>di</strong> terapia<br />

del <strong>di</strong>fetto base CF<br />

CFTR, a Cl- channel that is regulated by phosphorylation<br />

and ATP hydrolysis, is localized at the apical<br />

membrane in secretory epithelia such as the<br />

conducting airways and in the apical and basolateral<br />

membrane of the sweat duct. CFTR me<strong>di</strong>ates<br />

ion and water transport across the epithelial barrier<br />

1. A number of ion channels work in concert<br />

with CFTR. These include outwardly rectifying<br />

chloride channels (ORCC), epithelial so<strong>di</strong>um channels<br />

(ENaC), and inwardly rectifying potassium<br />

channels (ROMK2) (see 2 for a review). CFTR is also<br />

functionally associated with signal transduction<br />

enzymes 1. The functional interaction of CFTR with<br />

other proteins suggests that CFTR may be physically<br />

associated with these proteins.<br />

Ion channels in neuronal tissues are not <strong>di</strong>ffusely<br />

<strong>di</strong>stributed throughout the neurons but are rather<br />

localized and clustered at specialized subcellular<br />

site such as presynaptic and postsynaptic membranes.<br />

Scaffol<strong>di</strong>ng proteins that contain PDZ<br />

domains typically bind to the C-terminus of ion<br />

channels and organize them in three-<strong>di</strong>mension<br />

complexes at these locations 3. PDZ domain is a<br />

modular protein interaction domain consisting of<br />

80-90 amino acids. It was originally identified in<br />

post-synaptic density protein PSD95, drosophila<br />

tumor suppressor Dlg and epithelial tight junction<br />

protein ZO-1 3. In ad<strong>di</strong>tion to targeting channels<br />

and receptors to the specialized membrane, the<br />

action of scaffol<strong>di</strong>ng proteins organizes the related<br />

signaling molecules into macromolecular complexes.<br />

For example, the PDZ protein InaD localizes<br />

the transient receptor potential (TRP) channel to<br />

the rhabdomere, and assembles TRP into a functional<br />

protein complex with signal transduction<br />

molecules 4.

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!