The connection between a fatal car accident with a driver’s lack of sleep is reasonably simple to comprehend. However, have you ever thought that there may possibly be a connection between inadequate sleep and breast cancer? 101 women who were recently diagnosed with breast cancer participated in a study in 2012 that was trying to establish that a lack of sleep in such women patients triggered more aggressive tumors.

A research team from the Michigan State University (USA) published a report in Genes and Cancer that tried to portray the relationship between melatonin, a hormone involved in sleep-wake cycles with breast cancer stem cells along with trying to determine the promise of melatonin as cancer curative.

In order to pursue their research under clinical environment, the scientists created breast cancer cells known as mammospheres. This three-dimensional cell mix was produced bearing a resemblance to a configuration that may be found in an actual tumor in the body that was perceived to be the trigger behind the uninhibited tumor progression and relapse. David Arnosti, a Michigan State University professor and co-author on the study, best explains the significance of using the mammosphere method by saying, “You can watch bears in the zoo, but you only understand bear behavior by seeing them in the wild. Similarly, understanding the expression of genes in their natural environment reveals how they interact in disease settings. That’s what is so special about this work.”

The research utilized cancer cells that were classified as estrogen receptor (ER) –positive. The first stage of the trial examined the influence of melatonin on estrogen’s capability to upsurge the progression and magnitude of the mammospheres. The second stage, the team decided to dig a little deeper and studied melatonin’s effect from a genes and proteins standpoint. Transitioning through the cell wall, estrogen which is a steroid hormone unites the receptor inside the cell that travels to the cell’s nucleus to that particular area of the DNA that can stimulate the genes. A protein known as OCT4 is produced by one of these activated genes. This plays a key function in a stem cell’s capacity to indeterminately make reproductions of itself and to sustain its unspecialized, stem cell state. The expansion of the ER-positive breast cancer cells are hence driven via the estrogen-initiated cellular route. When melatonin was added to the cells, the investigation brought forward that estrogen- and BPA- enthused combination of the estrogen receptor to the OCT4 gene in the mammospheres was repressed.

Collating these reflections, the research team put forward that by using the mammosphere technique, the growth in the breast cancer tumor could be suppressed by inhibiting genes responsible for driving the stem cell-like properties of the breast cancer stem cells. Melatonin, a key factor in the entire process is produced by the brain’s pineal gland which is only active at night which on release can induce sleep. If however, the patient is suffering from sleep disorders like insomnia, the possibility of melatonin levels as an effective method to block the estrogen-driven cancer growth is significantly lessened.

James Trosko, whose MSU lab perfected the mammosphere technique, sees these breast cancer results in a larger perspective. He says, “This work establishes the principal by which cancer stem cell growth may be regulated by natural hormones, and provides an important new technique to screen chemicals for cancer-promoting effects, as well as identify potential new drugs for use in the clinic.”

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One of the most common forms of cancer amongst women globally is breast cancer. Once detected, there are three key elements that determine the course of treatment for breast cancer patients – diagnostic stage, receptor expression of steroids, and growth factors. Normal therapy during this condition includes a mixture of mastectomy, chemotherapy, and radiotherapy. However, in most cases, severe side effects have been noticed that has had a significant impact on the patient’s quality of life.

Multiple investigations conducted in the recent past have discovered that both human and rat umbilical cord matrix mesenchymal stem cells (UCMSC) have the power to limit the expansion of breast carcinoma cells. Whilst the actual mechanism of the tumour suppression process by naïve umbilical cord stem cells are still not wholly clear, quite a few instances have come forward during studies that have observed the immune systems of cancer-bearing rats that involve the induction of cell cycle arrest and/or apoptosis in tumour cells followed by an anti-tumour activation response. The mechanics of communication with adjacent cancer cells via the process of receiving and sending chemical signals in all likelihood occurs due to cytokines and growth factors. These investigative studies have shown that umbilical cord stem cells were able to suppress tumor growth by more than 90% in a 1:15 ratio, while human UCMSC suppressed the growth of human breast cancer cells by 50%. The mechanism for these differences is unknown, but it suggests that diverse cyclin-dependent kinases are regulated by rat and human UCMSC.

The present analysis revealed the modification of expression pattern in tumor suppressor genes in rat and human UCMSC when they were co-cultured with tumor cells. Nevertheless, it still remains unclear if the results will be similar if one co-cultured human breast carcinoma cells with human umbilical cord stem cells under in vitro and in vivo conditions.

Umbilical cord stem cells have a substantial potential to overcome tumor cells development in indirect co-culture which appears that UCMSC-dependent tumor cells growth inhibition is partially due to secretory proteins. Subsequently, through an evaluation of gene expressions profiles in rat and human UCMSC co-cultured with breast cancer cells may present the character of the key actors for the variance in tumoricidal capabilities in two types of UCMSC. Besides, recognition of the vital procedures in rat UCMSC dependent strong tumoricidal activity will be utilized to reinforce human UCMSC-dependent tumoricidal activity to the rat UCMSC level. In the present study, two tumor suppressor genes, ADRP and FST were found to be upregulated in rat UCMSC, whereas these two genes were down-regulated in human UCMSC when two types of UCMSC were co-cultured with corresponding species’ breast carcinoma cells. Therefore, these two gene expression differences in two types of UCMSC may explain their differential tumoricidal activities.

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