High exposure of TCDD can also result in continuous abortions in females which
are observed even now in parts of Seveso, Italy. Several conditions based on the
production of sperm in males such as oligospermia, asthenospermia and
teratozoospermia are still observed in few populations in Seveso, Italy.
Breastfeeding is one among the major mechanisms by which an offspring gets
exposed to dioxins and furans. One such study was conducted by Finnish group
researchers. The mothers were also affected by impaired fertility and endometriosis.
Few researchers in the Netherlands and Germany also concluded similar results of
that of the Finnish group of researchers. Few epidemiological studies were also
conducted based on environmental exposure to the human fetus and found out that
even without breastfeeding, the fetus was very vulnerable to both dioxins and furans
from the external atmosphere. Gray et al. (1997a, b) and Mably et al. (1992a)
reported the effects of TCDD and other such chemicals in the reproductive development of laboratory animals such as mice and rats. The animals showed signs of
decreased sperm count; vaginal thread reduced accessory gland weight and delayed
puberty.
Hale et al. (2019) assessed the contamination levels of dioxins/furans in American alligator embryos and concluded that the expression of several genes related to
embryo–yolk mass ratio and embryo mass was associated with the dioxin/furan
exposure. Different studies were performed at different dosage levels of exposure of
TCDD and concluded the detection of several types of sexual deformities in both
mice and rats. Hamm et al. (2000) reported about the lactation effects and
deformities in rats were due to the exposure of about 2.0 g TEQ/kg. The decrease
in sperm count in Holtzman rats was observed by Mably et al. (1992b) at a
significantly lower dose of about 0.5 g/kg. In contrary, Faqi et al. (1998) reported
the increased sperm production on the exposure of about 100 g PCB77/kg along with
an increase in the size of testicles. Manikkam et al. (2012) demonstrated TCDD
exposure on male Hsd:Sprague Dawley rats promoted transgenerational effects and
sperm epimutations on male reproduction. Several reproductive disorders such as
decreased fertility, lower daily sperm production, and low testosterone levels were
found in Sprague Dawley rats which were exposed to higher doses of furans
(Rehman et al. 2019). Foster et al. (2009) demonstrated utero exposure of TCDD
induced changes in epididymal sperm; however, spermatogenesis was not affected.
Pereg et al. (2001) reported the effects of intermediate reactive compounds that are
metabolized from dioxin and furan contamination which rapidly causes secondary
sexual deformities. Egeland et al. (1994) reported decreased testosterone and
increased gonadotropin levels in several workers of the NIOSH cohort who were
associated with the higher concentrations of dioxin compounds such as TCDD. In
1968, women were accidentally exposed to dioxin- and furan-contaminated rice oil
in Japan led to reducing the birth weight and hyperpigmentation of Yusho disease
(Tsukimori et al. 2012). During the time period 1977–1984, a test was conducted on
239 men and 296 women in Seveso, Italy, and reported that the sex ratio was
changed to an excess of females over males. This corresponds to the TCDD
contamination in that area during that period. This test was conducted to both parents
who were exposed to high doses of TCDD during the exposure. There was also an
14 Biological Implications of Dioxins/Furans Bioaccumulation in Ecosystems
413
are observed even now in parts of Seveso, Italy. Several conditions based on the
production of sperm in males such as oligospermia, asthenospermia and
teratozoospermia are still observed in few populations in Seveso, Italy.
Breastfeeding is one among the major mechanisms by which an offspring gets
exposed to dioxins and furans. One such study was conducted by Finnish group
researchers. The mothers were also affected by impaired fertility and endometriosis.
Few researchers in the Netherlands and Germany also concluded similar results of
that of the Finnish group of researchers. Few epidemiological studies were also
conducted based on environmental exposure to the human fetus and found out that
even without breastfeeding, the fetus was very vulnerable to both dioxins and furans
from the external atmosphere. Gray et al. (1997a, b) and Mably et al. (1992a)
reported the effects of TCDD and other such chemicals in the reproductive development of laboratory animals such as mice and rats. The animals showed signs of
decreased sperm count; vaginal thread reduced accessory gland weight and delayed
puberty.
Hale et al. (2019) assessed the contamination levels of dioxins/furans in American alligator embryos and concluded that the expression of several genes related to
embryo–yolk mass ratio and embryo mass was associated with the dioxin/furan
exposure. Different studies were performed at different dosage levels of exposure of
TCDD and concluded the detection of several types of sexual deformities in both
mice and rats. Hamm et al. (2000) reported about the lactation effects and
deformities in rats were due to the exposure of about 2.0 g TEQ/kg. The decrease
in sperm count in Holtzman rats was observed by Mably et al. (1992b) at a
significantly lower dose of about 0.5 g/kg. In contrary, Faqi et al. (1998) reported
the increased sperm production on the exposure of about 100 g PCB77/kg along with
an increase in the size of testicles. Manikkam et al. (2012) demonstrated TCDD
exposure on male Hsd:Sprague Dawley rats promoted transgenerational effects and
sperm epimutations on male reproduction. Several reproductive disorders such as
decreased fertility, lower daily sperm production, and low testosterone levels were
found in Sprague Dawley rats which were exposed to higher doses of furans
(Rehman et al. 2019). Foster et al. (2009) demonstrated utero exposure of TCDD
induced changes in epididymal sperm; however, spermatogenesis was not affected.
Pereg et al. (2001) reported the effects of intermediate reactive compounds that are
metabolized from dioxin and furan contamination which rapidly causes secondary
sexual deformities. Egeland et al. (1994) reported decreased testosterone and
increased gonadotropin levels in several workers of the NIOSH cohort who were
associated with the higher concentrations of dioxin compounds such as TCDD. In
1968, women were accidentally exposed to dioxin- and furan-contaminated rice oil
in Japan led to reducing the birth weight and hyperpigmentation of Yusho disease
(Tsukimori et al. 2012). During the time period 1977–1984, a test was conducted on
239 men and 296 women in Seveso, Italy, and reported that the sex ratio was
changed to an excess of females over males. This corresponds to the TCDD
contamination in that area during that period. This test was conducted to both parents
who were exposed to high doses of TCDD during the exposure. There was also an
14 Biological Implications of Dioxins/Furans Bioaccumulation in Ecosystems
413