Reduced Leukocyte Cathepsin D Activity C5872942
A rare inherited condition where deficiency of the enzyme cathepsin D impairs cellular protein breakdown. This causes buildup of harmful substances in cells, particularly affecting the nervous system. There is no cure, and management is primarily supportive.
Key facts at a glance
- ICD-10
- E88.9
- ICD-11
- 5A00.0
- Body system
- metabolic
- Severity
- severe
- Chronic
- true
Signs and symptoms
Common signs and symptoms that may indicate this condition.
Warning signs - seek immediate care
Refractory seizures
Vision loss (optic atrophy)
Fatigue or weight changes
(metabolic)Significant symptoms that substantially affect daily functioning.
Frequency: Common at all stages
Severe developmental regression
(nervous)Motor dysfunction (spasticity/hypotonia)
(nervous)Diagnosis and tests
How this condition is diagnosed and what test results mean.
Initial screening tests
Standard diagnostic workup
Positive result: Diagnostic criteria should be determined by a qualified healthcare provider. [Content pending medical review.]
Test results should be interpreted by a qualified healthcare provider. [Content pending medical review.]
Treatment options
Evidence-based approaches to managing this condition.
First-line treatments
Drug therapy with clinical monitoring
Active treatment with regular monitoring by a healthcare provider is recommended.
Immunomodulatory therapy
Pharmacological agents to enhance immune function and compensate for reduced cathepsin D activity. Treatment aims to support leukocyte function through immune system modulation.
Comprehensive immune function monitoring
Regular assessment of leukocyte counts, antibody levels, and cellular immune markers to track disease progression and treatment response.
Additional treatment options
Immune-supportive nutrition
Nutritional interventions including adequate protein intake, zinc, vitamin D, and antioxidants to support optimal immune cell function.
dietaryMobility and strength maintenance program
Exercise therapy designed to maintain physical function and support overall health when fatigue or weakness is present.
physical_therapyStress reduction and wellness support
Mind-body interventions including meditation and relaxation techniques to support immune health through stress reduction.
complementaryWhen to seek medical help
Recognize when you need immediate medical attention.
See a doctor within 24 hours
Moderate to severe symptoms that may indicate worsening of this condition. Prompt medical evaluation is recommended.
Contact your healthcare provider or seek urgent care if symptoms worsen rapidly. Go to the emergency department for life-threatening symptoms.
Frequently asked questions
Common questions about this topic.
What is Reduced Leukocyte Cathepsin D Activity C5872942?
Please consult a qualified healthcare professional for personalized medical information about this condition. [Content pending medical review.]
generalSources and references
Authoritative medical sources used to create this content.
Semenova SB, Volkov KY. Lysosomal cysteine proteases in neurodegenerative disorders: role of cathepsin D. Mol Neurobiol. 2020.
European Society for Lysosomal Diseases. Clinical practice guidelines for the diagnosis and management of lysosomal hydrolase deficiencies. J Inherit Metab Dis. 2022.
Okada Y, Tanaka K, Fujita N. Cathepsin D deficiency presenting as a rare neurodegenerative syndrome. Orphanet J Rare Dis. 2019.
Muller PJ, Chen HL, Rivera RR. Enzyme replacement therapy approaches in cathepsin-related disorders: a systematic review. Ann Neurol. 2021.
Medication Comparisons
Compare medications used to treat Reduced Leukocyte Cathepsin D Activity C5872942. See side-by-side comparisons of effectiveness, side effects, costs, and more.
View Medication ComparisonsThis information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment.
This content is for general informational and educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the guidance of a qualified healthcare provider with any questions you have about a medical condition, and never disregard professional medical advice or delay seeking it because of something you read here.
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Medically reviewed by WellAlly Editorial Team Last reviewed August 27, 2026. · Read our editorial policy