(Glycoprotein Storage Diseases; Mucopolysaccharidoses; MPS)
Lysosomal storage disease is a group of disorders that affect specific enzymes. These enzymes normally break down items for reuse in the cells. If the enzymes are missing or don't work properly the items can build up and become toxic. This occurs in an area of the cell called lysosomes. The build up eventually leads to damage of cells and organs in the body.
There are over 40 different types of lysosomal diseases. The diseases are characterized by the specific enzymes involved:
- Fabry Morquio’s disease—affects the kidney, heart, and skin
- Gaucher disease —affects the spleen and bones, and causes anemia
- Hurler’s syndrome—affects the spleen, liver, joints, and eyes; causes intellectual disability and deafness
- Maroteaux-Larny disease—affects the skin, bones, liver, and spleen
- Niemann-Pick disease —affects the spleen, liver, and lungs
- Pompe disease—affects the liver, heart, and muscle tissue
- Tay-Sachs disease —affects the brain
Copyright © Nucleus Medical Media, Inc.
Lysosomal storage disease is caused by a genetic problem. The genes that plan the production of the enzymes is faulty. Both parents must pass the gene on to the child in order for the disease to develop.
Lysosomal storage disease is more common in families with Ashkenazi Jewish, Finnish, or Dutch heritage. A family history increases the chance of the disease as well.
Symptoms can be severe and appear shortly after birth or mild and detected later in life. Symptoms will depend on the specific type of disease. Some common symptoms include:
- Recurrent infections or hernias
- Developmental delays
- Problems with hearing or sight
- Problems including pain with bones
- Problems with heart
These symptoms may be caused by other conditions. If your child has any of these symptoms, talk to the doctor right away.
The doctor will ask about your child's symptoms and medical history. A physical exam will be done. Skin and blood testing may be done to look for the specific enzyme that is causing the problem.
Other tests may include:
Prenatal testing and newborn screening may help with early detection.
Treatment is focused on managing the symptoms caused by the missing enzymes. Specific treatment depends on the enzyme defect that your child has but options may include:
- Dialysis —to remove substances from the blood
- Physical therapy
Other treatments may include:
- Substrate synthesis inhibition therapy (SSI)—Medication that decreases the item that build up in the cells due to missing enzymes.
- Enzyme replacement therapy (ERT)—Working enzymes are delivered through an IV to do the job of the defective enzymes.
- Stem cell transplant— Stem cells are transplanted through IV to encourage the body to make the missing enzyme.
There are no current guidelines to prevent these disorders.
Last reviewed August 2014 by Michael Woods, MD
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.