Two diabetes medications don’t slow progression of type 2 diabetes in youth

 

News Release

Monday, June 25, 2018

NIH-funded study adds to growing evidence that condition is more aggressive in youth.

In youth with impaired glucose tolerance or recent-onset type 2 diabetes, neither initial treatment with long-acting insulin followed by the drug metformin, nor metformin alone preserved the body’s ability to make insulin, according to results published online June 25 in Diabetes Care. The publication is concurrent to a presentation of the results at the American Diabetes Association Scientific Sessions in Orlando, Florida.

The results come from a study of 91 youth ages 10-19, part of the larger Restoring Insulin Secretion (RISE) study. To determine if early, aggressive treatment would improve outcomes, participants at four study sites were randomly assigned to one of two treatment groups. The first received three months of glargine — a long-acting insulin — followed by nine months of metformin. The second received only metformin for 12 months. Participants were then monitored for three more months after treatment ended. RISE was funded primarily by the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) of the National Institutes of Health.

The RISE Pediatric Medication Study found that beta cell function — key to the body’s ability to make and release insulin — declined in both groups during treatment and worsened after treatment ended. An earlier NIH-funded study also found that type 2 diabetes progresses more rapidly in youth than previously reported in adults despite comparable treatment.

“Only two drugs are currently approved for youth with type 2 diabetes, and we were disheartened to find that neither effectively slows disease progression,” said Dr. Ellen Leschek, project scientist for the RISE Consortium and program director in NIDDK’s Division of Diabetes, Endocrinology, and Metabolic Diseases. “Type 2 diabetes in youth has grown with the obesity epidemic, and we need treatments that work for kids. It’s clear from this study and others that type 2 diabetes in youth is more aggressive than in adults.”

The results were published concurrently in Diabetes Care with two other manuscripts that compared participants of the pediatric trial with their adult counterparts in two other RISE trials. Using baseline assessments, RISE researchers found that the youth had more insulin resistance and other signs of disease progression than their adult counterparts at the same stage in the disease, results consistent with other earlier studies. As well, the pediatric group at baseline responded to the severe insulin resistance with a greater insulin response than adults, potentially a reason for the youth’s more rapid loss of beta cell function.

While the RISE pediatric group’s treatments did not preserve or improve beta cell function, results showed modest improvement in blood glucose with metformin in both groups.

“Metformin is still a useful method to lower the blood glucose levels of youth with type 2 diabetes, but metformin alone is not a long-term solution for many youth,” said Dr. Kristen Nadeau, principal investigator of the RISE Pediatric Medication Study and professor of pediatric endocrinology at the University of Colorado, Anschutz Medical Campus. “As RISE shows, there is an urgent and growing need for more research to find options to adequately slow or prevent progression of type 2 diabetes in youth.”

The longer a person has type 2 diabetes, the greater the likelihood of developing complications including heart, kidney, eye, and nerve diseases, making it critical for young people with type 2 diabetes to quickly achieve and sustain control of their blood glucose.  However, because type 2 diabetes has historically been an adult condition, information about how to effectively treat youth is limited, and pediatric diabetes experts have had to rely on best practices for adult treatment – an imperfect translation given the differences in physiology between the groups.

“Our understanding of how type 2 diabetes affects youth is still maturing, and we must continue to explore treatments to ensure that these young people can live long, healthy lives,” said NIDDK Director Dr. Griffin P. Rodgers. “These results give us another piece of the puzzle to find which therapies will treat youth with type 2 diabetes.”

The RISE Consortium comprises three trials, all using similar assessments to measure results, to be compared with one another when all trials of the study are completed. The goal of RISE is to find ways to reverse or slow the loss of insulin production and insulin release, so people at risk for type 2 diabetes or recently diagnosed with the disease can stay healthier longer.

The RISE Pediatric Medication Study (NCT01779375) was conducted at the Children’s Hospital Colorado/University of Colorado, Aurora; Children’s Hospital of Pittsburgh; Yale University, New Haven, Connecticut; and Indiana University, Indianapolis. The RISE adult trials are being conducted at VA Puget Sound Health Care System and University of Washington, both in Seattle; Indiana University; and the University of Chicago and Jesse Brown VA Medical Center, Chicago (NCT01779362); and at the University of Southern California, Los Angeles (NCT01763346). The RISE Coordinating Center is at The George Washington University Biostatistics Center, Rockville, Maryland. Learn more about RISE at www.risestudy.org.

NIH support for RISE comes primarily through NIDDK grants U01DK94430, U01DK94431, U01DK94406, U01DK94438, and U01DK094467, with additional support from the National Center for Advancing Translational Sciences. The Department of Veterans Affairs, Kaiser Permanente Southern California, and the American Diabetes Association also support the studies, with additional donations of supplies from Allergan Corporation, Apollo Endosurgery, Abbott Laboratories, and Novo Nordisk A/S.

The NIDDK, part of the NIH, conducts and supports basic and clinical research and research training on some of the most common, severe, and disabling conditions affecting Americans. The Institute’s research interests include: diabetes and other endocrine and metabolic diseases; digestive diseases, nutrition, and obesity; and kidney, urologic, and hematologic diseases. For more information, visit www.niddk.nih.gov.

About the National Institutes of Health (NIH):
NIH, the nation’s medical research agency, includes 27 Institutes and Centers and is a component of the U.S. Department of Health and Human Services. NIH is the primary federal agency conducting and supporting basic, clinical, and translational medical research, and is investigating the causes, treatments, and cures for both common and rare diseases. For more information about NIH and its programs, visit www.nih.gov.

NIH…Turning Discovery Into Health®

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Spastic paraplegia type 49 – Genetics Home Reference

 

Spastic paraplegia type 49 is part of a group of genetic disorders known as hereditary spastic paraplegias. These disorders are characterized by progressive muscle stiffness (spasticity) and the development of paralysis of the lower limbs (paraplegia). Hereditary spastic paraplegias are divided into two types: pure and complex. The pure types involve only the lower limbs, whereas the complex types also involve the upper limbs (to a lesser degree) and other problems with the nervous system. Spastic paraplegia type 49 is a complex hereditary spastic paraplegia.

Spastic paraplegia type 49 often begins with weak muscle tone (hypotonia) that starts in infancy. During childhood, spasticity and paraplegia develop and gradually worsen, causing difficulty walking and frequent falls. In addition, affected individuals have moderate to severe intellectual disability and distinctive physical features, including short stature; chubbiness; an unusually small head size (); a wide, short skull (); a short, ; and . Some people with spastic paraplegia type 49 develop seizures.

Problems with autonomic nerve cells (autonomic ), which control involuntary body functions such as heart rate, digestion, and breathing, result in several features of spastic paraplegia type 49. Affected individuals have difficulty feeding beginning in infancy. They experience a backflow of stomach acids into the esophagus (called or GERD), causing vomiting. GERD can also lead to recurrent bacterial lung infections called aspiration pneumonia, which can be life-threatening. In addition, people with spastic paraplegia type 49 have problems regulating their breathing, resulting in pauses in breathing (apnea), initially while sleeping but eventually also while awake. Their blood pressure, pulse rate, and body temperature are also irregular.

People with spastic paraplegia type 49 can develop recurrent episodes of severe weakness, hypotonia, and abnormal breathing, which can be life threatening. By early adulthood, some affected individuals need a machine to help them breathe (mechanical ventilation).

Other signs and symptoms of spastic paraplegia type 49 reflect problems with sensory neurons, which transmit information about sensations such as pain, temperature, and touch to the brain. Many affected individuals are less able to feel pain or temperature sensations than individuals in the general population. Affected individuals also have abnormal or absent reflexes (areflexia).

Because of the nervous system abnormalities that occur in spastic paraplegia type 49, it has been suggested that the condition also be classified as a hereditary sensory and autonomic neuropathy, which is a group of conditions that affect sensory and autonomic neurons.

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