An international team of researchers has developed a tGnRH protein-based therapy that has improved the cognitive functions of a small group of patients with Down’s Syndrome.
The study, whose results are published today in Science, has been led by the University of Lille (France) and the University Hospital of Lausanne (Switzerland), and has had the participation of the University of Córdoba (UCO) and the Institute of August Pi i Sunyer Biomedical Research (Idibaps).
Down syndrome, which affects one in 800 peopleis the main cause of intellectual disability and causes various clinical manifestations, including the deterioration of cognitive capacity.
With age, 77% of sufferers experience symptoms similar to those of Alzheimer’s disease. Alzheimer’s.
In addition, people with this syndrome suffer from the gradual loss of olfactory capacity -typical of neurodegenerative diseases- and possible deficits in sexual maturation in the case of men.
The gonadotropin releasing hormone (GnRH) is an essential protein in reproductive function, “the signal with which the brain controls the reproductive system”explains in statements to EFE the co-author of the study Manuel Tena-Sempere, a researcher at the UCO and the Center for Biomedical Research in Network (Ciber) of Physiopathology of Obesity and Nutrition.
However, at the Neuroscience and Cognition Laboratory in Lille, led by Vincent Prévot, researchers found that in mouse models of Down syndrome this protein does not work properly, which contributes to the cognitive impairment associated with this syndrome. That is, GnRH also plays an essential role in cognitive function.
Based on this finding, the Lille researchers (whose first author is María Manfredi-Lozano, currently at the University of Seville) carried out a proof of concept in mice to restore the GnRH system and try to make it work correctly.
Using different approaches and tests to check the cognitive and olfactory function of the mice, they showed that by activating the GnRH neurons, the system was normalized and both functions improved.
These findings were then tested in a clinical phase carried out at the University Hospital of Lausanne, in a study with seven male patients with Down syndrome aged between 20 and 50 years.
to these patients they were administered a pulsatile GnRH therapy that every two hours he gave them a dose of GnRH to simulate the secretion of this hormone at normal levels and achieve a physiological pattern, like the one that people without this syndrome have.
After six months of treatment, the researchers evaluated the effects of the therapy and, using cognitive and olfactory tests and MRI examinations, found that the treatment had not improved olfactory function but cognitive function.
According to the study, six of the seven patients achieved better three-dimensional representation, better understanding of instructions and reasoning, attention and memory.
“The work points to the possible usefulness of the compound for treat cognitive problems derived from Down syndromebut has also given promising results in mouse models of Alzheimer’s“, comments Tena-Sempere.
And although larger clinical studies that include women with Down syndrome will be needed, this compound “is already used in fertility treatments, that is, it is not new, but it is known to be safe and its effects are known, all that It will help cut times if it is approved for this use,” he says.
Regardless of the therapeutic implications that this study may have in the future, for Tena-Sempere the work is important to remember that basic science can lead to “unexpected findings” that can be very useful for clinical research.
In the opinion of Mara Diessena neurobiologist expert in Down syndrome at the Center for Genomic Regulation, the experiments in mice that have been carried out in this study “are elegant and support the authors’ hypotheses”, she explained to Science Media Center Spain.
“Possibly the weakest part is the clinical study, in which the authors only evaluated seven people with Down syndrome. So, while certainly interesting and promising, we have to be careful not to raise too many expectations among families” and have Keep in mind that the study has only been done in men, he points out.
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