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The Effect of Oral Administration of 9-cis Rich Powder of the Alga Dunaliella Bardawil on Visual Functions im Patients With Retinitis Pigmentosa

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT01256697
Recruitment Status : Completed
First Posted : December 8, 2010
Last Update Posted : December 20, 2013
Information provided by (Responsible Party):
Dr. Ygal Rotenstreich, Sheba Medical Center

Brief Summary:

Retinitis pigmentosa is a genetically determined disease consisting of progressive centripetal retinal degeneration starting in the rods outer segments. Its prevalence is 1:4000 people and is the fourth most common blinding disease in Israel in 2004 [7% of all blindness]. The investigators tried to treat a non-progressive form of the disease [Fundus Albipunctatus] by oral therapy of the food supplement made from alga Dunaliella bardawil composed of approximately 50% 9-cis β-carotene. The alga Dunaliella bardawil accumulates high concentration of β -carotene when grown under appropriate conditions. The β -carotene of the alga is composed of approximately 50% of all-trans - β carotene and 50% 9-cis β -carotene.

The 9-cis β -carotene has shown to be a precursor of 9-cis retinoic acid both in-vitro in human intestinal mucosa and in-vivo in a ferret, perfuse with 9-cis b-carotene. The night vision, as measured objectively by electroretinography (ERG) more than doubled in six patients tested. The visual field was also improved significantly.

Condition or disease Intervention/treatment Phase
Retinitis Pigmentosa Dietary Supplement: Alga Dunaliella Bardawil Dietary Supplement: Alga Dunaliella Bardawill Other: Sugar pill Not Applicable

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 34 participants
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: The Effect of Oral Administration of 9-cis Rich Powder of the Alga Dunaliella
Study Start Date : August 2008
Actual Primary Completion Date : April 2009
Actual Study Completion Date : January 2011

Resource links provided by the National Library of Medicine

Arm Intervention/treatment
Experimental: Alga Dunaliella Bardawil Dietary Supplement: Alga Dunaliella Bardawil
9-cis Rich Powder

Dietary Supplement: Alga Dunaliella Bardawill
9-cis Rich Powder

Placebo Comparator: Sugar pill Other: Sugar pill
Sugar pill

Primary Outcome Measures :
  1. Electroretinogram scotopic maxiamal b-wave amplitude responses in microvolts [ Time Frame: 1 year ]
    Using the protocol of the International Society for Clinical Electrophysiology of Vision and the UTAS 3000 system (LKC Technologies, Gaithersburg, MD), we recorded full-field electroretinographic responses from both eyes of each patient. The scotopic conditions, after 30 minutes of dark adaptation we recorded the maximal scotopic response. The b-wave amplitude responses will be messured in each eye.

Secondary Outcome Measures :
  1. The area within the Dark adapted chromatic Goldamann Visual field in isopters in cm2 [ Time Frame: 1 year ]
    Kinetic visual field for chromatic stimuli will be recorded in both eye after 30 minutes of dark adaptation. area of vision within the isopter will be measured by software in cm2.

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   Female
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Written informed consent to participate in the study.
  • Men or women aged 18 years or older.
  • Electroretinogram (ERG) responses compatible with the diagnosis of Retinitis Pigmentosa

Exclusion Criteria:

  • Current smokers.
  • Current use of Vitamin A/ beta carotene supplements.
  • Active arterial disease within 3 months of study entry such as unstable angina, myocardial infarction, transient ischemic attack (TIA), stroke, and coronary artery bypass graft (CABG) surgery.
  • History of malignancy, except basal or squamous cell skin carcinoma.
  • Pregnant women, women who are breast feeding, and women of childbearing potential who are not using chemical or mechanical contraception.
  • Uncontrolled hypertension defined as either resting diastolic blood pressure of >95mmHg (taken from the mean of 3 readings) or resting systolic blood Pressure of > 180 mmHg.
  • History of alcohol abuse or drug abuse, or both.
  • Patient plans to engage in vigorous exercise or an aggressive diet regimen.
  • Uncontrolled endocrine or metabolic disease.
  • Participation in another investigational drug study within 4 weeks of entry into this study.
  • Serious or unstable medical or psychological condition that, in the opinion of the investigator, would compromise the subject's safety or successful participation in the study.
  • Subject whose hormone replacement therapy (HRT) or oral contraceptive therapy (OCT) was initiated within the 3 month prior to enrollment.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT01256697

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Sheba Medical Center
Tel Hashomer, Israel
Sponsors and Collaborators
Sheba Medical Center
Publications of Results:
Publications automatically indexed to this study by Identifier (NCT Number):
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Responsible Party: Dr. Ygal Rotenstreich, Ophthalmologist, Sheba Medical Center Identifier: NCT01256697    
Other Study ID Numbers: SHEBA -08-5086-YR-CTIL
First Posted: December 8, 2010    Key Record Dates
Last Update Posted: December 20, 2013
Last Verified: December 2013
Additional relevant MeSH terms:
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Retinitis Pigmentosa
Retinal Diseases
Eye Diseases
Eye Diseases, Hereditary
Retinal Dystrophies
Retinal Degeneration
Genetic Diseases, Inborn