TAU Discovers Experimental Compound Effective in Treating Symptoms of Autism and Alzheimer’s Disease

An extensive international study led by Tel Aviv University found that an experimental drug which has been awarded orphan drug designation by the FDA for future treatment of a rare development disorder can also treat a variety of symptoms relating to autism, intellectual disability, and Alzheimer’s disease.

The experimental drug, NAP, was discovered in the lab of Prof. Illana Gozes of the Tel Aviv University
Sackler Medical School’s Department of Human Molecular Genetics and Biochemistry. In recent years,
the FDA has granted the experimental drug with orphan drug designation and pediatric rare disease
designation for treatment of a rare developmental disorder called ADNP syndrome, which can cause a
variety of symptoms, among them, hallmark features are intellectual disability and autism spectrum
disorder.

In the current study, a team of researchers led by Prof. Gozes developed an innovative lab model and
found that NAP can be effective in treating a broad spectrum of symptoms of ADNP syndrome, which is
caused by mutations in the ADNP gene which is essential to cerebral development and protecting cerebral
brain cells. Previous studies showed that ADNP syndrome is related to Alzheimer’s disease and certain
types of mental disabilities, developmental delays, and autism.

Professor Ilana Gozes
Image credit: Jonathan Blum, Tel Aviv University

Ramot, Tel Aviv University’s technology commerce company filed a number of patent applications to
protect the technology and its implementation and, in collaboration with Prof. Gozes, is raising funds to
finance further clinical research. Similarly, Ramot is in discussions regarding commercial collaboration
with pharmaceutical companies. “We’re excited by this new discovery and believe that this is
groundbreaking technology that will remedy a variety of symptoms and disabilities in a broad spectrum of
orphan diseases,” said Prof. Keren Primor Cohen, CEO of Ramot.

The study, which is the culmination of the MD/PhD student Dr. Gideon Carmon’s doctoral research, was
joined by a team of researchers from Prof. Gozes’s lab: Dr. Shlomo Sergovich, Gal Hacohen-Kleiman,
Inbar Ben-Horin-Hazak, Dr. Oxana Kapitansky, Alexandra Lubincheva, and Dr. Eliezer Giladi. The team
was further joined by Dr. Moran Rubinstein, Prof. Noam Shomron, and Guy Shapira of TAU’s Sackler
Faculty of Medicine, and Dr. Metsada Pasmanik Chor of Tel Aviv University’s George S. Wise Faculty of
Life Sciences. Researchers from the Czech Republic, Greece, Germany, and Canada also participated. The
article was published in the prestigious journal Biological Psychiatry.

Prof. Gozes explained that: “NAP, in fact, comprises a short segment of the normal ADNP protein. We
previously found that treatment using NAP corrects the function of human nerve cells afflicted with
ADNP syndrome in a laboratory test-tube. In this study, we sought to examine the efficacy of NAP in
treating various aspects of the syndrome using a model with the most harmful mutation, which allowed us
to view brain development and facilitate remedying of behavioral problems.”

The study, which examined a model using mice with ADNP syndrome, used objective methods to analyze
behavior, electrical activity, and to further identify select protein contents in the brain. The researchers
found that the mice suffering from ADNP syndrome demonstrated a broad spectrum of pathological
outcomes, including increased rates of neonatal death immediately after birth, slowed development and
aberrant gait, primarily among females, as well as poor voice communication.

Cerebral examinations demonstrated additional findings: A relatively small number of synapses – the
points of contact tween nerve cells, impaired electrophysiological activity demonstrating a low potential
for normal cerebral arousal, as well as precipitates (aggregates) of the Tau protein in young mice, similar
to those in the brains of elderly Alzheimer’s disease patients.

For most of these symptoms, the researchers examined the effect of the future medicinal substance NAP –
made of a short and normal segment of the ADNP protein, the same protein that is impaired because of
the mutation. Prof. Gozes: “In the past, we have found that NAP corrects impaired functioning of ADNP
that has mutated in the nerve cell model in the culture. We now examined its effect in vivo – in animals
modeling the syndrome (ADNP mutation). To our amazement and joy, we discovered that treatment using
NAP normalizes the functioning of these mice for most of the symptoms indicated above!”

Researchers further sought to identify – in the blood of the mice, a clear biological indicator of ADNP
syndrome that will enable diagnosis of this severe disease and effective monitoring of treatment using a
simple blood test. With the help of genetic sequencing technologies, they identified an anomaly in a
manner characteristic only of females as well as a method for repair using NAP on five proteins (at the
messenger RNA level). These findings matched the changes discovered in white blood cells of children
suffering from ADNP syndrome. One of the indicators discovered is FOXO3 – a protein with an
important role in generating cerebral synapses and healthy aging.

Prof. Gozes summarized: “In this study, we examined the effect of the ADNP gene’s most prevalent
mutation in a broad spectrum of aspects and found extensive impairment in physical and cerebral
functioning parallel to the symptoms of autism, developmental delay, mental disability, and Alzheimer’s
disease in humans. Similarly, we examined the potential use of the NAP drug for treating these diseases,
and discovered that it is effective against most of these symptoms in lab models. This study is an
important milestone on the way to developing a drug, or drugs, that will help children with autism
stemming from genetic mutations, as well as Alzheimer’s patients.”

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