CIQUIBIC   05472
CENTRO DE INVESTIGACIONES EN QUIMICA BIOLOGICA DE CORDOBA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
TEST OF POSSIBLE MECHANISMS INVOLVED IN THE ELONGATION AND RETRACTION OF CAD CELL NEURITES
Autor/es:
ARCE C. A.; CHESTA M. E.; BISIG C .G.; ZAMPAR G. G.; CARBAJAL A.
Lugar:
Santa Cruz
Reunión:
Workshop; Emerging Concept on Neuronal Cytoskeleton; 2011
Institución organizadora:
Instituto de Dinámica Celular y Biotecnología (ICDB)
Resumen:
CAD
cells (derived from a cathecolaminergic region of mouse brain) represent a
useful system to study elongation and retraction of neurites since: 1) rounded
cells proliferate in standard culture medium; 2) when deprived of serum, cells
stop proliferation and emit long processes similar in many aspects to normal
neurons; 3) neurites rapidly retract when serum is re-added and cells resume
growth. We previously found that microtubules (MTs) in these cells are highly
dynamic (t ½ = 3 min, nocodazol treatment; t ½ = 6 min, FRAP), many of the
major MAPs are absent, tubulin is mainly tyrosinated (Glu-tubulin is scarce and
Delta 2-tubulin is absent), and acetylated tubulin is practically not detected.
Herein, we investigated several possible factors that could influence
elongation and/or retraction of neurites. Integrity and disassembly of MTs was
required for neurite elongation and retraction, respectively. Transient
increase of acetylated tubulin neither increased stability of MTs nor impeded
retraction of neurites. Expression of Delta 2-tubulin did not alter elongation
or retraction. Conditions that favour the interaction of MTs with plasma
membrane Na,K-ATPase did not alter elongation or retraction. Treatment of cells
with Lysophosphatidic acid (LPA) or with adenosine deaminase (ADA), in the
absence of serum, induced neurite retraction. ATP and/or microfilaments depletion prevented
retraction suggesting that the actomyosin system is important in the retraction
mechanism.