Growth Hormone Treatment Improves Social Impairments in Patients with Genetic Disorder Known to Cause Autism
A growth hormone can significantly improve the social impairment associated with autism spectrum disorder (ASD) in patients with a related genetic syndrome.
A growth hormone can significantly improve the social impairment associated with autism spectrum disorder (ASD) in patients with a related genetic syndrome, according to a pilot study conducted at the Icahn School of Medicine at Mount Sinai and published today on Pub Med, a public database of biomedical topics maintained by the National Institutes of Health (study originally published in the December 12 issue of the journal Molecular Autism).
The study results focus specifically on the use of insulin-like growth factor-1 (IGF-1) to treat Phelan-McDermid syndrome (PMS), a disorder caused by a deletion or mutation of the SHANK3 gene on chromosome 22. Along with facing developmental and language delays and motor skill deficits, most people with PMS also have autism spectrum disorder.
SHANK3 is a focus of research in the field because of its essential role in the function of synapses, the gaps between nerve cells that “decide” whether messages continue along nerve pathways as they regulate bodily processes. While Phelan-McDermid syndrome is a rare disorder, advanced genetic technology has revealed it to be a relatively common cause of ASD.
“Ours is the first controlled trial of any treatment for Phelan-McDermid syndrome,” says Alexander Kolevzon, MD, Clinical Director of the Seaver Autism Center at the Icahn School of Medicine at Mount Sinai. “Because different genetic causes of ASD converge on common underlying chemical signaling pathways, the findings of this study may have implications for many forms of ASD.”
IGF-1 is a commercially available compound that promotes nerve cell survival, synaptic maturation and synaptic plasticity, the ability of synapses to strengthen or weaken over time, in response to increases or decreases in their activity. It is currently approved by the Food and Drug Administration for the treatment of short stature.
The Mount Sinai study is the first to suggest that IGF-1 is safe, tolerable and associated with significant improvement in both social impairment and restrictive behaviors (fascination with one subject or activity; strong attachment to one specific object; preoccupation with part[s] of an object rather than the whole object; preoccupation with movement or things that move) in people with Phelan-McDermid syndrome, said the study authors.
Researchers enrolled nine children aged 5-15 years who were diagnosed with Phelan-McDermid syndrome in a placebo-controlled, double-blind, cross-over design study. All participants were exposed to three months of treatment with IGF-1 and three months of placebo, in random order. Compared to placebo, the IGF-1 phase was associated with significant improvement in social withdrawal and restrictive behaviors as measured by the Aberrant Behavior Checklist and the Repetitive Behavior Scale respectively, both standard behavior scales used to assess treatment effects in ASD.
Preclinical studies of SHANK3 deficient mouse models developed at Mount Sinai and human neuronal models derived from pluripotent stem cells (stem cells that have the capacity to produce several distinct biological responses) of humans with SHANK3 deficiency previously suggested that IGF-1 can reverse synaptic plasticity and motor learning deficits. These studies formed the basis of this clinical trial and the results provide support for the ongoing effort to develop related drug treatments.
“This clinical trial is part of a paradigm shift to develop targeted, disease modifying medicines specifically to treat the core symptoms of ASD,” says Joseph Buxbaum, PhD, Director of the Seaver Autism Center and Professor of Psychiatry, Genetics and Genomic Sciences and Neuroscience at Mount Sinai. “Results from this pilot trial will facilitate larger studies that more definitively inform efficacy and better targeted therapeutic treatments.”
This study was funded by that Beatrice and Samuel A. Seaver Foundation and by the National Institute of Mental Health, part of the National Institutes of Health.
About the Seaver Autism Center for Research and Treatment at Mount Sinai
The Seaver Autism Center for Research and Treatment at Mount Sinai conducts progressive research studies aimed at understanding the multiple causes of autism spectrum disorders (ASD). The multidisciplinary team is comprised of experts in the fields of genetics, molecular biology, model systems, neuroimaging, and experimental therapeutics who are dedicated to discovering the biological causes of ASD. The Center strives to develop innovative diagnostics and treatments for integration into the provision of personalized, comprehensive assessment and care for people with ASD. The Seaver Autism Center was founded through the generous support of the Beatrice and Samuel A. Seaver Foundation. For more information, visit www.seaverautismcenter.org.
About the Mount Sinai Health System
The Mount Sinai Health System is New York City's largest integrated delivery system encompassing seven hospital campuses, a leading medical school, and a vast network of ambulatory practices throughout the greater New York region. Mount Sinai's vision is to produce the safest care, the highest quality, the highest satisfaction, the best access and the best value of any health system in the nation.
The System includes approximately 7,100 primary and specialty care physicians; 10 joint-venture ambulatory surgery centers; more than 140 ambulatory practices throughout the five boroughs of New York City, Westchester, Long Island, and Florida; and 31 affiliated community health centers. The Icahn School of Medicine is one of 3 medical schools that have earned distinction by multiple indicators: ranked in the top 20 by U.S. News & World Report's "Best Medical Schools", aligned with a U.S. News & World Report's "Honor Roll" Hospital, No. 13 in the nation for National Institutes of Health funding, and among the top 10 most innovative research institutions as ranked by the journal Nature in its Nature Innovation Index. This reflects a special level of excellence in education, clinical practice, and research. The Mount Sinai Hospital is ranked No. 18 on U.S. News & World Report's "Honor Roll" of top U.S. hospitals; it is one of the nation's top 20 hospitals in Cardiology/Heart Surgery, Diabetes/Endocrinology, Gastroenterology/GI Surgery, Geriatrics, Nephrology, and Neurology/Neurosurgery, and in the top 50 in four other specialties in the 2017-2018 "Best Hospitals" issue. Mount Sinai's Kravis Children's Hospital also is ranked in six out of ten pediatric specialties by U.S. News & World Report. The New York Eye and Ear Infirmary of Mount Sinai is ranked 12th nationally for Ophthalmology and 50th for Ear, Nose, and Throat, while Mount Sinai Beth Israel, Mount Sinai St. Luke's and Mount Sinai West are ranked regionally.