Another paper has been published and revealed another potential treatment for myotonic dystrophy, Phenylbutazone PBZ.. Interestingly this study was also done in Japan………… now a hotbed of repositioning drugs for treatment of myotonic dystrophy. some info from the study
“Using the drug repositioning strategy, we found that PBZ markedly elevated MBNL1 expression in myogenic cells(Fig. 1 and Supplementary Fig. S1) as well as in skeletal muscles in HSALR mice model (Fig. 2 and Supplementary Fig. S2). PBZ mitigated muscle pathology (Fig. 2d,e) and improved the running wheel activity and grip strength
in HSALR mice (Fig. 2c and Supplementary Fig. S2d).”
This summary above showed that in mice this drug helped mice with myotonic dystrophy run on the wheel better and had better grip strength. More info below
PBZ is an NSAID with anti-inflammatory, antipyretic, and analgesic activities. PBZ was approved in humans for rheumatoid arthritis and gout in 1949. Although incidental adverse effects of fatal liver disease and aplastic anemia markedly lowered the use of PBZ, PBZ is still used as an alternative drug for ankylosing spondylitis32,33.
Interestingly, another NSAID, ketoprofen has been reported to suppress CUG-induced lethality in Drosophila34, and we also found that 50 μ M ketoprofen upregulated the expression of Mbnl1 mRNA 1.2-fold in C2C12 cells, which was lower than the 1.3-fold increase of Mbnl1 mRNA by 50 μ M PBZ (Supplementary Fig. S6). Ketoprofen
and some other NSAIDs may have beneficial effects on a mouse model of DM1, as well as on DM1 patients.
Editors Note: This drug (PBZ) approval was removed for humans in 2003 in the USA and Canada. It is available for use in animals only. The drug Ketoprofen was not studied in depth but is an approved NSAZID drug in the USA. We have choosen the image of Ketoprofen as this is an approved drug in the USA.
Full study is Here.. Phenylbutazone Treatment DM1 mice
In 2002 a study in Sweden was conducted to see if a drug, Erythromycin would help improve the stomach emptying rate in patients with Myotonic Dystrophy. This study looked at 10 patients… here are a few key details:
“Gastrointestinal symptoms are
common among affected individuals and they may be of
considerable clinical relevance, e.g. abdominal pain, diarrhoea,
or anal incontinence. In a recent study we have found
that one-quarter of the patients considered their gastrointestinal
symptoms to be the most troublesome consequence
of the disease .”
The study showed that the drug erythromycin did not improve stomach emptying time but did help the majority of patients with diarrhea. In general the patients thought this drug improved their condition.
“Nevertheless, in general the patients
considered the treatment effective. This could be explained
by possible effects of the drugs on parts of the gastrointestinal
tract other than the stomach [15,16] due to the widespread
involvement of the gastrointestinal tract in MD
[9,17]. This assumption gains support in our study from the
fact that six out of 10 patients experienced reduced
symptoms of diarrhoea.”
A recently published article has great information about weight and breathing. Simple conclusion: is that being overweight with Myotonic Dystrophy can affect your breathing and respiratory function. Since respiratory failure and pneumonia are big issue with Myotonic Dystrophy pay special attention to your weight!!! It also showed that a great majority of people with DM have an abnormal body composition. ITs important to keep the weight off but you also must see a nutritionist to insure that you are getting proper nutrition and to look at your body weight/mass/BMI. Here is the summary
InDM1 patients, overweight is an independent factor for predicting TLC, and contributes independently of FIV1. Because overweight isr elated to increased work of breathing and inspiratory muscle strength is reduced inDM1, the fatigue threshold will be reached sooner. Therefore, muscle fatigue and the onset of respiratory failure will develop at an earlier stage in overweight patients, especially during increased ventilator demand. Moreover, over half of DM1patients are overweight, and nearly all patients have an abnormal body composition. To develop interventional strategies for weight loss, it will be important to categorize the individual type of body composition. Hence, preventing the development of overweight inDM1 patients may result in delaying respiratory failure and mortality in DM1.
Click below on the link for the full study
Overweight Myotonic Dystrophy
New information on a heart problem that is present in many of the adult patients with myotonic dystrophy – atrial flutter. This is the heart beating too fast in the upper chambers of the heart. This new information from France gives an over view and possible treatments for this symptom. Sorry the whole article is not available for free!
2016 Feb 10. pii: S0960-8966(15)30123-1. doi: 10.1016/j.nmd.2016.01.005. [Epub ahead of print]
Atrial flutter in myotonic dystrophy type 1: Patient characteristics and clinical outcome.
A recent republished article appeared in Pediatrics. Dr. Calderon described 6 cases of Congential Myotonic Dystrophy that had global delay. He also complied 55 cases 53 or which had global developmental delay. The diagnosis were by muscle biopsy then no DNA tests were available. The information urged using this as a differential diagnosis.
Below is the PDF of the article
Mental Retardation and Myotonic Dystrophy 1966