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2009 Vienna - European Society of Human Genetics

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Therapy for genetic disorders<br />

P14.12<br />

systemic gene therapy for cardiomyopathy and muscular<br />

dystrophy <strong>of</strong> the BiO14.6 hamster<br />

I. Rotundo 1 , S. Faraso 1 , C. Vitiello 1 , E. De Leonibus 1 , G. Nigro 2 , G. Di Salvo 2 ,<br />

D. Di Napoli 3 , S. Castaldo 3 , S. Aurino 1 , A. Auricchio 1,4 , V. Nigro 1,5 ;<br />

1 Telethon Istitute <strong>of</strong> <strong>Genetics</strong> and Medicine, Naples, Italy, 2 A.O. Monaldi, Seconda<br />

Università degli Studi di Napoli, Naples, Italy, 3 Centro di Bi<strong>of</strong>armacologia,<br />

Ospedale A. Cardarelli, Naples, Italy, 4 Dipartimento di Pediatria, Università degli<br />

Studi di Napoli “Federico II”, Naples, Italy, 5 5Dipartimento di Patologia Generale,<br />

Seconda Università degli Studi di Napoli, Naples, Italy.<br />

The delta-sarcoglycan deficient Syrian hamster strain BIO14.6 is one<br />

<strong>of</strong> the most studied models for inherited dilated cardiomyopathy and<br />

muscular dystrophy. This carries a spontaneous deletion <strong>of</strong> the deltasarcoglycan<br />

gene promoter and first exon. Its lifespan is shortened to<br />

10-15 months because heart slowly dilates towards heart failure. We<br />

injected the human delta-sarcoglycan cDNA by AAV2/8 by single intraperitoneal<br />

injection at two weeks <strong>of</strong> age. We obtained the body-wide<br />

restoration <strong>of</strong> delta-sarcoglycan expression associated with functional<br />

reconstitution <strong>of</strong> the sarcoglycan complex and with significant lowering<br />

<strong>of</strong> centralized nuclei and fibrosis in skeletal muscle. Motor ability<br />

and cardiac functions were rescued. Using serotype 2/8 in combination<br />

with serotype 2/1, lifespan was extended up to 22 months with<br />

sustained heart function improvement.<br />

It is know that corticosteroids have beneficial therapeutic roles in the<br />

treatment <strong>of</strong> Duchenne and Becker muscular dystrophies and sarcoglycanopathies.<br />

These drugs allow the maintenance <strong>of</strong> walking, slowing<br />

down the progression <strong>of</strong> the disease.<br />

At present, all patients with a defined diagnosis <strong>of</strong> muscular dystrophy<br />

are corticosteroid-treated. Our aim is to evaluate the combined effects<br />

<strong>of</strong> gene and glucocorticoid treatments using BIO14.6 hamsters. We<br />

treated at the age <strong>of</strong> 45 days BIO14.6 hamsters using cycles <strong>of</strong> 0.3<br />

mg/kg deflazacort for 3 weeks followed by 3 weeks <strong>of</strong> interval without<br />

drug. The effects <strong>of</strong> the interaction were evaluated by serial echocardiography,<br />

behavioral tests and histology.<br />

P14.13<br />

the experience <strong>of</strong> enzyme replacement therapy for<br />

mucopolysaccharidosis Vi in Belarus<br />

A. Gusina, A. Kulpanovich, V. Kuryshka, N. Gusina, E. Budzeiko, I. Naumchik;<br />

National Research and Applied Medicine Centre “Mother and Child”, Minsk,<br />

Belarus.<br />

Introduction: Mucopolysaccharidosis VI (MPS VI) is a lysosomal storage<br />

disease caused by the deficiency <strong>of</strong> the arylsulfatase B (ASB). The<br />

disease is heterogeneous in clinical presentation and progression. Recently,<br />

galsulfase (Naglazyme® [BioMarin]), recombinant human ASB<br />

became available as long-term enzyme replacement therapy (ERT).<br />

Goal <strong>of</strong> this study: to present and compare the safety and efficacy<br />

<strong>of</strong> galsulfase in 2 patients presenting mild and severe phenotypes <strong>of</strong><br />

MPS VI.<br />

Methods: two female MPS VI patients 29 and 32 years old were treated<br />

with 1.0 mg/kg galsulfase for 12 weeks. Urinary excretion <strong>of</strong> glycosaminoglycans<br />

(GAG), endurance, liver and spleen volumes, cardiac<br />

and pulmonary function were investigated.<br />

Results: Improved endurance mentioned in 4 weeks <strong>of</strong> ERT. After 12<br />

weeks patients showed 91 and 18 m gain in 12-minute walk and 55<br />

and 18 stair pr<strong>of</strong>it in 3-minute stair climb. Best results were achieved by<br />

mildly affected patient. Urinary GAG level decreased by 60% and 90%<br />

in patient with mild and severe phenotype respectively in 4 weeks and<br />

was sustained thereafter in both. Liver and spleen volumes reduced<br />

by 20% in both patients. We found slight improvement in pulmonary<br />

and cardiac function in patient with mild disease, but not in severely<br />

affected patient. There were no adverse events or allergic reactions<br />

within the period <strong>of</strong> ERT.<br />

Conclusions: ERT was well tolerated in patient with mild and severe<br />

clinical presentation <strong>of</strong> MPS VI. Biochemical response was similar in<br />

both patients, while patient with mild disease showed more rapid and<br />

significant clinical response.<br />

P14.14<br />

Phage lambda-derived nanobioparticles; a new generation <strong>of</strong><br />

eukaryotic gene delivery vehicles<br />

M. Khalaj-Kondori 1 , M. Sadeghizadeh 1 , M. Behmanesh 1 , P. Gill 2 ;<br />

1 Department <strong>of</strong> <strong>Genetics</strong>, Faculty <strong>of</strong> Basic Sciences, Tarbiat Modares University,<br />

Tehran, Islamic Republic <strong>of</strong> Iran, 2 Department <strong>of</strong> Nanobiotechnology, Faculty<br />

<strong>of</strong> Basic Sciences, Tarbiat Modares University, Tehran, Islamic Republic <strong>of</strong> Iran.<br />

Attempts to treatment <strong>of</strong> diseases caused by genetic deficiencies -<br />

gene therapy- have ever faced with various challenges. One <strong>of</strong> the<br />

major challenges in this regard, is selection <strong>of</strong> a safe and proper carrier.<br />

Viral vectors are efficient gene carriers to eukaryotic cells, but, in<br />

spite <strong>of</strong> their high gene delivery efficiency, suffer from frailties such as<br />

stimulation <strong>of</strong> the immune system, likelihood <strong>of</strong> transformation <strong>of</strong> the<br />

host cells. Bacteriophages have developed significant adaptation to<br />

the immune system as they reside every where including the human<br />

body. Moreover, it was reported that bacteriophages are safe to eukaryotic<br />

cells and possess various capabilities e.g. potential <strong>of</strong> genetic<br />

manipulation and targeting which are the most important features <strong>of</strong> a<br />

potential proper delivery vehicle. In the present study, to evaluate the<br />

potency <strong>of</strong> phages as eukaryotic gene delivery vehicles, the sequence<br />

encoding the GFP was inserted into the Lambda ZAP-CMV vector,<br />

under the CMV promoter followed by in vitro packaging. The resultant<br />

phage particles were further manipulated with rat apo-transferrin as<br />

a targeting moiety to formulate directed phage lambda derived nanobioparticles.<br />

Further, the transfection efficacy <strong>of</strong> directed and non-directed<br />

phage nanobioparticles into the rat intestinal epithelial cell line<br />

IEC-18, was compared using fluorescent microscopy followed by flowcytometery.<br />

Our results highlight the potency <strong>of</strong> the phage lambda derived<br />

nanobioparticles as a new gene delivery route into eukaryotic<br />

cells in gene therapy trails.<br />

P14.15<br />

Generating genetically engineered bone marrow stromal stem<br />

cells with reduced rate <strong>of</strong> cell death after induction <strong>of</strong> neural<br />

differentiation<br />

S. J. Mowla 1 , Z. Hajebrahimi 1 , M. Tavallaei 2 , M. Movahedin 1 , M. R. Soroush 3 ;<br />

1 Tarbiat Modares University, Tehran, Islamic Republic <strong>of</strong> Iran, 2 Molecular Biology<br />

Research Center, Baqiyatallah Medical Sciences University, Tehran, Islamic<br />

Republic <strong>of</strong> Iran, 3 Janbazan Medical and Engineering Research Center, Tehran,<br />

Islamic Republic <strong>of</strong> Iran.<br />

Bone marrow stromal cells (BMSCs) are adult stem cells that have the<br />

potential for transdifferentiation into cell types including neuronal cells.<br />

Neural-like cells derived from BMSCs carry the potential for repairing<br />

degenerative or traumatic CNS injuries. The functional recovery <strong>of</strong><br />

the CNS promoted by these cells, however, depends on their survival<br />

for prolonged periods following grafting into the lesion site. We have<br />

investigated the expression pr<strong>of</strong>ile <strong>of</strong> the main regulators <strong>of</strong> neuronal<br />

survival /death during neural differentiation <strong>of</strong> BMSCs. Interestingly,<br />

the expression <strong>of</strong> p75NTR, common receptor <strong>of</strong> Neurotrophins, is absent<br />

in un-differentiated cells but is initiated by 6 hours after induction<br />

<strong>of</strong> differentiation and remained at this level by 12 hours. The expression<br />

is completely shot downed thereafter. During this period <strong>of</strong> time<br />

(6-12 hrs after differentiation) a substantial proportion <strong>of</strong> cells undergo<br />

cell death via apoptosis. Inhibition <strong>of</strong> p75NTR receptor using a small<br />

interfering RNA revealed a 3.5-fold reduction <strong>of</strong> apoptosis in neural<br />

like cells derived from rat BMSCs. The finding provides a method to<br />

increase the survival <strong>of</strong> the stem cells upon the induction <strong>of</strong> neural differentiation<br />

based on the inhibition <strong>of</strong> p75NTR receptor and provides<br />

the applicable manipulation methods in order to increase the efficiency<br />

<strong>of</strong> cell-based transplantation to cure neurodegenerative disorders.<br />

P14.16<br />

surgical aspects in Prader-Willi patients<br />

C. M. Popoiu1 , V. L. David2 , M. Puiu1 , D. Dan3 , M. Lesovici2 , E. Ursu2 , A.<br />

Popoiu1 , E. S. Boia1 ;<br />

1University <strong>of</strong> Medicine and Pharmacy “Victor Babes”, Timisoara, Romania,<br />

2 3 Children’s Hospital “Louis Turcanu”, Timisoara, Romania, Prader Willi Association<br />

Romania, Zalau, Romania.<br />

Prader-Willi syndrome (PWS) is the most common genetic cause <strong>of</strong><br />

life-threatening obesity caused by the lack <strong>of</strong> a functional paternal<br />

copy <strong>of</strong> 15q11-q13 chromosome. Main clinical features are: hypotonia<br />

and feeding difficulties in the neonatal period, hyperphagia and severe<br />

childhood obesity at an early age, short stature, varying degrees

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