INVESTIGADORES
BELDOMENICO Pablo Martin
artículos
Título:
Developmental exposure to endocrine disruptor chemicals alters follicular dynamics and steroid levels in Caiman latirostris
Autor/es:
STOKER C; BELDOMENICO PM; BOSQUIAZZO V; ZAYAS M; REY F; RODRIGUEZ H; MUÑOZ-DE-TORO M; LUQUE EH
Revista:
GENERAL AND COMPARATIVE ENDOCRINOLOGY
Referencias:
Año: 2008 vol. 156 p. 603 - 612
ISSN:
0016-6480
Resumen:
Human and wildlife are exposed at critical periods of development to endocrine disruptor chemicals (EDC) that may be responsible
for reproductive disorders. To test the hypothesis that in ovum exposure to EDC at a critical period for gonadal organogenesis alters
post-hatching folliculogenesis and steroidogenesis in Caiman latirostris, we studied the impact of in ovum exposure to 17b-estradiol
(E2), bisphenol A (BPA), endosulfan (END) and atrazine (ATZ) on gonadal differentiation, follicular dynamics and circulating levels
of steroid hormones in neonatal and juvenile caiman. Since C. latirostris is a species with temperature dependent sex determination, eggs
were incubated at male (33 C) or female (30 C) producing temperatures and the effect of EDC was evaluated. Neonatal ovaries exhibited
germ cells mainly located in clusters evidencing proliferative activity and type I to III follicles. Juvenile ovaries exhibited germ cells
and advanced stages of pre-vitellogenic follicles. Prenatal exposure to the highest doses of E2 (1.4 ppm) or BPA (140 ppm) overrode male
temperature effect on sex determination. Neonatal females produced by sex reversion lacked type III follicles, while females prenatally
exposed to the lowest doses of E2 (0.014 ppm) and BPA (1.4 ppm) or ATZ (0.2 ppm) showed an increase in type III follicles. Juvenile
caiman prenatally exposed to E2 or BPA showed an augmented incidence of multioocyte follicles. Neonatal female caiman exposed in
ovum to E2 or BPA had higher estrogen serum levels whereas exposure to E2, BPA, ATZ and END decreased T levels. Present data demonstrates
that exposure to EDC during gonadal organogenesis alters follicular dynamics and steroid levels later in life. These effects
might have an impact on caiman fertility.in ovum exposure to EDC at a critical period for gonadal organogenesis alters
post-hatching folliculogenesis and steroidogenesis in Caiman latirostris, we studied the impact of in ovum exposure to 17b-estradiol
(E2), bisphenol A (BPA), endosulfan (END) and atrazine (ATZ) on gonadal differentiation, follicular dynamics and circulating levels
of steroid hormones in neonatal and juvenile caiman. Since C. latirostris is a species with temperature dependent sex determination, eggs
were incubated at male (33 C) or female (30 C) producing temperatures and the effect of EDC was evaluated. Neonatal ovaries exhibited
germ cells mainly located in clusters evidencing proliferative activity and type I to III follicles. Juvenile ovaries exhibited germ cells
and advanced stages of pre-vitellogenic follicles. Prenatal exposure to the highest doses of E2 (1.4 ppm) or BPA (140 ppm) overrode male
temperature effect on sex determination. Neonatal females produced by sex reversion lacked type III follicles, while females prenatally
exposed to the lowest doses of E2 (0.014 ppm) and BPA (1.4 ppm) or ATZ (0.2 ppm) showed an increase in type III follicles. Juvenile
caiman prenatally exposed to E2 or BPA showed an augmented incidence of multioocyte follicles. Neonatal female caiman exposed in
ovum to E2 or BPA had higher estrogen serum levels whereas exposure to E2, BPA, ATZ and END decreased T levels. Present data demonstrates
that exposure to EDC during gonadal organogenesis alters follicular dynamics and steroid levels later in life. These effects
might have an impact on caiman fertility.Caiman latirostris, we studied the impact of in ovum exposure to 17b-estradiol
(E2), bisphenol A (BPA), endosulfan (END) and atrazine (ATZ) on gonadal differentiation, follicular dynamics and circulating levels
of steroid hormones in neonatal and juvenile caiman. Since C. latirostris is a species with temperature dependent sex determination, eggs
were incubated at male (33 C) or female (30 C) producing temperatures and the effect of EDC was evaluated. Neonatal ovaries exhibited
germ cells mainly located in clusters evidencing proliferative activity and type I to III follicles. Juvenile ovaries exhibited germ cells
and advanced stages of pre-vitellogenic follicles. Prenatal exposure to the highest doses of E2 (1.4 ppm) or BPA (140 ppm) overrode male
temperature effect on sex determination. Neonatal females produced by sex reversion lacked type III follicles, while females prenatally
exposed to the lowest doses of E2 (0.014 ppm) and BPA (1.4 ppm) or ATZ (0.2 ppm) showed an increase in type III follicles. Juvenile
caiman prenatally exposed to E2 or BPA showed an augmented incidence of multioocyte follicles. Neonatal female caiman exposed in
ovum to E2 or BPA had higher estrogen serum levels whereas exposure to E2, BPA, ATZ and END decreased T levels. Present data demonstrates
that exposure to EDC during gonadal organogenesis alters follicular dynamics and steroid levels later in life. These effects
might have an impact on caiman fertility.2), bisphenol A (BPA), endosulfan (END) and atrazine (ATZ) on gonadal differentiation, follicular dynamics and circulating levels
of steroid hormones in neonatal and juvenile caiman. Since C. latirostris is a species with temperature dependent sex determination, eggs
were incubated at male (33 C) or female (30 C) producing temperatures and the effect of EDC was evaluated. Neonatal ovaries exhibited
germ cells mainly located in clusters evidencing proliferative activity and type I to III follicles. Juvenile ovaries exhibited germ cells
and advanced stages of pre-vitellogenic follicles. Prenatal exposure to the highest doses of E2 (1.4 ppm) or BPA (140 ppm) overrode male
temperature effect on sex determination. Neonatal females produced by sex reversion lacked type III follicles, while females prenatally
exposed to the lowest doses of E2 (0.014 ppm) and BPA (1.4 ppm) or ATZ (0.2 ppm) showed an increase in type III follicles. Juvenile
caiman prenatally exposed to E2 or BPA showed an augmented incidence of multioocyte follicles. Neonatal female caiman exposed in
ovum to E2 or BPA had higher estrogen serum levels whereas exposure to E2, BPA, ATZ and END decreased T levels. Present data demonstrates
that exposure to EDC during gonadal organogenesis alters follicular dynamics and steroid levels later in life. These effects
might have an impact on caiman fertility.C. latirostris is a species with temperature dependent sex determination, eggs
were incubated at male (33 C) or female (30 C) producing temperatures and the effect of EDC was evaluated. Neonatal ovaries exhibited
germ cells mainly located in clusters evidencing proliferative activity and type I to III follicles. Juvenile ovaries exhibited germ cells
and advanced stages of pre-vitellogenic follicles. Prenatal exposure to the highest doses of E2 (1.4 ppm) or BPA (140 ppm) overrode male
temperature effect on sex determination. Neonatal females produced by sex reversion lacked type III follicles, while females prenatally
exposed to the lowest doses of E2 (0.014 ppm) and BPA (1.4 ppm) or ATZ (0.2 ppm) showed an increase in type III follicles. Juvenile
caiman prenatally exposed to E2 or BPA showed an augmented incidence of multioocyte follicles. Neonatal female caiman exposed in
ovum to E2 or BPA had higher estrogen serum levels whereas exposure to E2, BPA, ATZ and END decreased T levels. Present data demonstrates
that exposure to EDC during gonadal organogenesis alters follicular dynamics and steroid levels later in life. These effects
might have an impact on caiman fertility.2 (1.4 ppm) or BPA (140 ppm) overrode male
temperature effect on sex determination. Neonatal females produced by sex reversion lacked type III follicles, while females prenatally
exposed to the lowest doses of E2 (0.014 ppm) and BPA (1.4 ppm) or ATZ (0.2 ppm) showed an increase in type III follicles. Juvenile
caiman prenatally exposed to E2 or BPA showed an augmented incidence of multioocyte follicles. Neonatal female caiman exposed in
ovum to E2 or BPA had higher estrogen serum levels whereas exposure to E2, BPA, ATZ and END decreased T levels. Present data demonstrates
that exposure to EDC during gonadal organogenesis alters follicular dynamics and steroid levels later in life. These effects
might have an impact on caiman fertility.2 (0.014 ppm) and BPA (1.4 ppm) or ATZ (0.2 ppm) showed an increase in type III follicles. Juvenile
caiman prenatally exposed to E2 or BPA showed an augmented incidence of multioocyte follicles. Neonatal female caiman exposed in
ovum to E2 or BPA had higher estrogen serum levels whereas exposure to E2, BPA, ATZ and END decreased T levels. Present data demonstrates
that exposure to EDC during gonadal organogenesis alters follicular dynamics and steroid levels later in life. These effects
might have an impact on caiman fertility.2 or BPA showed an augmented incidence of multioocyte follicles. Neonatal female caiman exposed in
ovum to E2 or BPA had higher estrogen serum levels whereas exposure to E2, BPA, ATZ and END decreased T levels. Present data demonstrates
that exposure to EDC during gonadal organogenesis alters follicular dynamics and steroid levels later in life. These effects
might have an impact on caiman fertility.to E2 or BPA had higher estrogen serum levels whereas exposure to E2, BPA, ATZ and END decreased T levels. Present data demonstrates
that exposure to EDC during gonadal organogenesis alters follicular dynamics and steroid levels later in life. These effects
might have an impact on caiman fertility.