INVESTIGADORES
VALLES Ana Sofia
congresos y reuniones científicas
Título:
HYPERTHERMIA IMPAIRS SERTOLI CELL FUNCTIONS. EFFECTS ON LIPID METABOLISM
Autor/es:
VALLÉS, A.S.; AVELDAÑO, M.I.; FURLAND, N.E.
Lugar:
Buenos Aires
Reunión:
Congreso; SAIB; 2013
Resumen:
Spermatogenesis is known to be vulnerable to temperature. Previous
work from our group showed that in vivo testicular hyperthermia
selectively damages germ cells at specific developmental stages and
rapidly induces a seminiferous epithelium involution. This concurred
with a considerable buildup of lipid droplets in Sertoli cells (SC).
The aim of this study was to examine the effects of heat exposure
on isolated SC in culture. Warming to 43ºC disrupted SC microtubule
network and actin microfilaments. This SC cytoskeleton
perturbation was accompanied by increased ROS production,
mitochondrial depolarization, and accumulation of triacylglicerols
(TAG). The heat exposure-dependent TAG accumulation could be
explained by an impairment of mitochondrial fatty acid oxidation
and a re-direction of fatty acids into TAG synthesis and lipid droplet
formation. The impaired mitochondrial physiology also reduced
the de novo synthesis of cardiolipin, as observed after incubating
SC cultures with [3H]arachidonic acid. The hyperthermia-induced
cytoskeletal and mitochondrial alterations could in part respond
for the lipid metabolic disorder that SC undergo. Since these cells
provide support to germ cells, these changes might be one of the
underlying causes of the temporal impairment of spermatogenesis
observed in vivo during testicular hyperthermia.