Oestrogen changes neuroblastoma cells into neurons

The female sex hormone oestrogen can perform an important role in neuroblastoma, a form of cancer mainly affecting young children. In laboratory experiments, researchers at Karolinska Institutet in Sweden demonstrate that oestrogen treatment and overexpression of the oestrogen receptor cause malignant neuroblastoma cells to mature into neuron-like cells.

Neuroblastoma forms in the peripheral nervous system and is one of the most common forms of solid cancer in young children. The disease mainly affects babies and young children, and while in some cases the tumours can disappear of their own accord, the majority are aggressive, metastasising cancer tumours that are resistant to modern combinations of surgery, radiotherapy and intensive chemotherapy.

The most aggressive forms of neuroblastoma are often associated with a more active MYCN gene, which drives tumour cell growth and spread and inhibits the maturation of the cells. Researchers focus on the activity of this gene and how it relates to neuroblastoma. MYCN is often seen only as a marker for a poor prognosis, but it's critical to the disease and is a possible target for new drugs.

In a previous study, the group discovered that activation of MYCN results in the formation of specific microRNAs, which are relatively small RNA molecules that regulate proteins. Some of these microRNAs disable the oestrogen receptor ERalpha. The present study shows that the inhibition of these microRNA molecules or oestrogen therapy in combination with an overexpression of the oestrogen receptor can cause aggressive neuroblastoma cells with MYCN activation to mature into neuron-like cells which behave more like normal cells.

The researchers studied tumour tissue from patients, cultivated human tumour cells and tumours in mouse models for neuroblastoma. In the mice, the neuron-like cells did not grow as quickly as the original cancer cells, and analyses of the tumour tissue from patients show that those with a high level of the oestrogen receptor have a better survival rate than those with a low. Oestrogen could be a therapeutic method for patients who express high levels of the oestrogen receptor. Another therapy could involve deregulating MYCN or upregulating the oestrogen receptor and then treating with oestrogen.
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Breast cancer gene

Breast cancer is caused by complex interactions between a large number of genetic variants and our environment. The inherited component of breast cancer risk is due to a combination of rare variants in genes such as BRCA1 and BRCA2 that confer a high risk of the disease, and many genetic variants that each confer only a small risk.

The newly identified risk regions nearly double the number that are already known, thereby bringing the number of known common variants associated with breast cancer to about 180.
One in five women are in greater danger of getting breast cancer because of faults in their genes. Women are at risk of breast cancer if their mother, daughter or sister has breast cancer.

For one in five women, the errors written into their genes mean they have almost a third higher chance of getting breast cancer. An unlucky one per cent have three times the risk of the other 99 per cent of the population.

These gene changes now have the potential to be incorporated into existing models to accurately predict an individual's risk, and to improve both prevention and early detection of the disease. The study looked at 11.8 million single-letter 'spelling mistakes' in women's DNA which increase their risk of breast cancer.

The researchers discovered nine more variations affecting the gene BRCA1. In total, they have confirmed 107 genetic variants and discovered 72 new ones. The discovery allowed the team to calculate that one in ten women have a 70 per cent higher risk of getting breast cancer.

About 70 per cent of all breast cancers are fuelled by the sex hormone oestrogen and respond to hormone therapies such as tamoxifen.
Others, known as oestrogen-receptor negative, are not affected by the hormone and are more difficult to treat.

In a second study, the researchers found 10 new variants linked to these cancers, the two cancer types are biologically distinct and develop differently.
Breast cancer susceptibility is due to the effect of a large number of inherited genetic variants, each of which may only confers a slight increase in breast cancer risk, when the strongly predisposing genes such as BRCA1 and BRCA2 are not considered.

The study discovered 65 new variants, some of which are common, have each of which has only a small effect on breast cancer risk, but cumulatively they could be very important in altering a woman's risk of breast cancer.
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Facts about male menopause

Levels of our sex hormones decline with age. For some men, the symptoms
attributed to low testosterone. Male menopause are sign of unhealthy aging Low testosterone indicates that you are not living healthy.

The normal range of testosterone can be from 10.4 to 41.6 nmol/l (nanomoles per litre of blood). A man can be healthy and sexually active while having a
relatively low testosterone level.

Men can boost testosterone level by living healthy lifestyle, engaging in
regular exercise, maintaining healthy weight, eating healthy diet and cutting down on alcohol.

The more you sleep, the more testosterone your body produces. Research shows that severe sleep deprivation can cause testosterone levels to drop by 70 per cent.

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