Smoking can
causes asthma in third generation
The dangers of smoking on users and their children are known but new
research demonstrates that it also can causes asthma
in their grandchildren.
Asthma is a major public health problem. It is the most common chronic disease of childhood. While there are many factors which contribute to asthma - maternal smoking during pregnancy is a well known, and avoidable, risk.
During pregnancy nicotine can affect a developing foetus' lungs, predisposing the infant to childhood asthma.
Researchers from Harbor-UCLA Medical Centre, California, tested the effect of nicotine exposure during pregnancy on rats, looking not only at their pups but also at second generation pups.
Exposure inside the uterus resulted in both male and female offspring having reduced lung function consistent with asthma.
It also impaired lung function of their own offspring, even though the first generation rats were not themselves exposed to nicotine once they were born, according to an UCLA statement.
Levels of proteins increased by maternal smoking in the lungs of their offspring such as fibronectin, collagen and nicotinic aceylcholine receptors, were also found to be raised in the grandchildren.
Source: www.timesofindia.com
31.10.2012
Smoking
'may lead to cataract in elderly'
In a new study,
researchers have found new evidence that smoking may also increase the risk of
age-related cataract, which is the leading cause of blindness and vision loss
in the world.
The new findings are
the result of a meta-analysis conducted by a team of researchers from China.
“Although cataracts can
be removed surgically to restore sight, many people remain blind from cataracts
due to inadequate surgical services and high surgery expenses,” author Juan Ye,
MD from Zhejiang University in China said.
“Identifying modifiable
risk factors for cataracts may help establish preventive measures and reduce
the financial as well as clinical burden caused by the disease,” Ye said.
The team performed the
analysis using 12 cohorts and eight case-control studies from Africa, Asia,
Australia, Europe and North America, to compare the prevalence of age-related
cataract in individuals who ever smoked cigarettes to those who have never
smoked.
Further subgroup
analyses were performed based on the subjects’ status as a past or current
smoker and the three subtypes of age-related cataract. The results showed that
every individual that ever smoked cigarettes was associated with an increased
risk of age-related cataract, with a higher risk of incidence in current
smokers.
In the subgroup
analysis, former and current smokers showed a positive association with two of
the subtypes - nuclear cataract, when the clouding is in the central nucleus of
the eye, and subscapular cataract, when the clouding is in the rear of the lens
capsule.
The analysis found no
association between smoking and cortical cataract, in which the cloudiness
affects the cortex of the lens.
While the overall
analysis suggests that smoking cigarettes may increase the risk of age-related
cataracts, the researchers point out that further effort should be made to
clarify the underlying mechanisms. “We think our analysis may inspire more
high-quality epidemiological studies,” Ye said.
“Our analysis shows
that association between smoking and the risk of age-related cataract differ by
subtypes, suggesting that pathophysiologic processes may differ in the
different cataract types,” Ye added.
The study has been
published in Investigative Ophthalmology and Visual Science.
Source: www.dnaindia.com
31.10.2012
A
duty which becomes a desire will ultimately become a delight
George
Gritter