The role of
glutathione in the development of the fetus and placenta is crucial.
Glutathione can control differentiation, proliferation, and apoptosis-essential
functions in developing embryo. Glutathione plays an important role in the
development of organs (organogenesis) and embryo (embryogenesis).
Studies have
clearly shown how chemicals (like 2 nitrosoflourene and acetaminophen) which
modulate intracellular glutathione (GSH) and cysteine levels cause developmental
abnormalities (dysmorphogenesis) in the fetus. (5,6,7).
This also
explains why lower levels of glutathione activities(like those caused by drugs
and increased oxygen levels) during organogenesis, may make the fetus more
vulnerable to damage. (8)
Inthe placenta, glutathione detoxifies before
they reach the developing child.
Most
substances or factors which cause birth defects (teratogens) are know to exert
embryotoxic effects because they cause oxidative stress. (9)
The fetus is
sensitive to the toxic and teratogenic effects of the chemicals in the early
embryonic stages, whereas it is sensitive to carcinogenic effect during late
fetal stages.
Carcinogens
administered to the mother can be transferred through the placenta and induce
cancer in the fetus. Many potential carcinogens tend to act as abortifacient
and teratogens as well. Many carcinogens are much more active in the fetus than
in adults. (10,11)
Increasing
evidence points to potential risks of delayed effects upon prenatal exposure to
chemicals. In fact, several systems (e.g. excretorynervous) show important
developmental processes right after the organogenetic period, up to the
postnatal phase. So this would also be sensitive to developmental toxicants.
ENVIRONMENTAL FACTORS: POLLUTIONS AND TOXINS
A large
number of substances in the environment are known to be toxic to the growing
fetus. It is impossible to completely eliminate exposure to many of them,
because we inhale or ingest them through polluted food, air and water.
Many of
these compounds exert a damaging effects through the production of free
radicals that lower glutathione levels. Glutathione, as the master antioxidant,
plays an important protective role in detoxifying these chemicals and reducing
their toxic effects.
1.Radiation
Placental glutathione status is sensitive to environmental pollution-as a
study of placental detoxifying activity in chemically polluted or radioactively
contaminated regions like the Ukraine has shown.(12,13)
2.Pesticides and Persistent Organic
Pollutants (POP’s)
Exposure to pesticides and polychlorinated biphenyls or persistent
organic pollutants similar to those who are present in the diet of people is
found to alter liver gene expressions in the mother and the fetus. These
changes have functional implication during pregnancy.
3.Air pollution
Let’s face it! We are living in a
polluted world.
It is a common knowledge that pollution is not good to our health pregnant
or not. Common component of pollution is nitrogen-oxide compounds and it leads
to increase risk of methomoglobin. It is
a brownish-red form of hemoglobin that occurs when hemoglobin is oxidized
either during decomposition of the blood or by the action of various oxidizing
drugs or toxic agents. It contains iron in the ferric state and cannot function
as an oxygen carrier.
Due to this
state, the lungs are not functioning properly and the heart is unable to pump
enough blood to the lungs for oxygenation (hypoxemia) leading to a decreased
in the amount of oxygen reaching
body tissues (Hypoxia). This will alter normal development of fetus and
increase the risk of anemia, threatened abortion, premature labor, eclampsia
and other pregnancy complications.
Glutathione
helps fight the harmful effects of pollution by detoxifying harmful substances
and helps cells to absorb oxygen resulting distribution of healthy blood and
maintain healthy organs.
4.Heavy metals (mercury, cadmium, arsenic)
5.Vinyl chloride
6.Acryonitrile
7.Excess Oxygen (hyperoxia)
8.Anti-psychotic and anti-epileptic drugs (AEDs)
9.Thalidomide
10.10.Cigarette
smoke
11.Alcohol (ethanol) consumption
Maternal health factors that increase free radicals and cause
birth defects include:
o Diabetes
o Pre-eclampsia
o Infection and Inflammation
Glutathione and other
antioxidants attenuate oxidative stress in pregnant women with inflammation or
maternal conditions like diabetes and pre-eclampsia, and in fetuses at risk for
developing cystic fibrosis.
Supplementation with glutathione
precursors and antioxidants can decrease the incidence of birth defects and
protect both mothers and the fetus from the damaging and possibly fatal
consequences of pregnancy complications.
Glutathione (GSH) also prevents
or minimizes the oxidative stress that occurs during labor and the birth
process.
Perinatal or birth
asphyxia/hypoxia (deprivation of oxygen supply to the brain) in preterm
deliveries and labor can lead to cerebral palsy, respiratory distress syndrome,
irreversible brain injury, and permanent neurological and intellectual
handicaps.
Administration of the glutathione
precursor, N-Acetyl-Cysteine (NAC), to the pregnant mother partially prevents
oxidative stress during the birth process in premature infants.
Currently, the American College
of Obstetrics and Gynecology advises all pregnant women to take a prenatal
vitamin containing antioxidants.
In addition, they advise eating
lots of fresh fruits and vegetables, the best sources of antioxidant
protection.
Comments (0) >>
Write comment
You must be logged in to post a comment. Please register if you do not have an account yet.