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Broccoli Sprout Extract Effects on Allergic Inflammation in the Nose

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.
ClinicalTrials.gov Identifier: NCT00882115
Recruitment Status : Completed
First Posted : April 16, 2009
Results First Posted : November 15, 2018
Last Update Posted : September 20, 2019
Information provided by (Responsible Party):
Zhaoping Li, University of California, Los Angeles

Brief Summary:
Allergic airway disease is a term used to describe conditions such as allergic rhinitis and asthma. Among other causative agents, air pollutants and diesel exhaust in particular, have been shown to create and also worsen existing allergic airway disease. These inhaled pollution particles have oxidative properties that drive inflammation-related effects through specific metabolic-associated processes. These processes are not adequately suppressed by current therapeutics. The purpose of this study is to explore the effects of broccoli sprout extract on the inflammatory process in the nose caused by diesel exhaust particles, which are important elements in air pollution. Broccoli sprout extract is a very potent inducer of Phase II enzymes (natural antioxidants).

Condition or disease Intervention/treatment Phase
Allergic Airway Disease Drug: Broccoli sprout extract (BSE) Not Applicable

Detailed Description:

Antioxidant enzymes are proteins produced by the body to protect cells against the harmful effects of chemicals, such as those found in air pollution. Particulate air pollution and diesel exhaust in particular have been shown to cause and also exacerbate allergic airway disease. While there are ongoing efforts to improve air quality, there remains a need for alternative methods to address and prevent the adverse health effects of ambient air pollution, such as allergic rhinitis,, asthma, chronic obstructive pulmonary disease, and lung cancer. Currently, there are no therapeutic options which, directly target and address the effects of air pollutants in susceptible populations.

The purpose of this study is to examine the effect of broccoli sprout extract on airway inflammation caused by diesel exhaust particles. This study will analyze whether broccoli sprout extract will increase the levels of the natural, helpful, antioxidant enzymes in the nose and as a result decrease the inflammation caused by nasal exposure to diesel exhaust particles.

Participants will attend up to ten clinical visits, which include three screening visits. Some visits (2, 4, and 9) will last approximately 1 hour and require that the participants return to the clinic after 6 hours. The remaining visits (excluding Visit 1, which will also last about 1 hour) will take less than 30 minutes. Participants are restricted from consuming certain vegetables three days prior to, and during the course of the study.

During the screening phase, which will last from 4-5 days, and after giving informed consent participants will undergo a baseline evaluation that includes a medical history, a physical exam, blood drawing, allergy skin testing, nose washing, and a diesel exhaust particle (DEP) challenge test. For the DEP test, a small amount of fluid containing DEP particles will be sprayed in the nose (this amount is equivalent to the DEP that one breathes in over 2 days in Los Angeles). Investigators will also screen for natural antioxidant-related genes antioxidant enzymes and other indicators of DEP sensitivity. Female participants of child bearing potential will have a urine pregnancy test.

Participants will be asked to drink broccoli sprout extract for four days in a row (visits 6, 7, 8, and 9). The dosage is less than 1 cup and requires that participants fast 2 hours before the study visits when broccoli sprout extract is ingested. This study requires that participants be allergic to cat. An allergy skin test will be performed to determine whether they have this kind of allergy.

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 38 participants
Allocation: N/A
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Basic Science
Official Title: Broccoli Sprout Extract Effects on the Inflammatory Response to Diesel Exhaust Particles in the Nose
Study Start Date : July 10, 2009
Actual Primary Completion Date : December 2011
Actual Study Completion Date : December 2011

Arm Intervention/treatment
Experimental: DEP challenge in subjects consuming BSE
DEP will be administered in nostrils of participants who received BSE intervention by drinking 1 cup of liquid containing 1.25 g BSE daily for 4 days, or without consuming BSE.
Drug: Broccoli sprout extract (BSE)
BSE will be ingested by drinking a liquid formula containing 1.25 g BSE in a volume equaling 1 cup daily for 4 consecutive days in the BSE intervention phase.
Other Name: Sulforaphane

Primary Outcome Measures :
  1. Total Nasal Cell Count in Response to DEP Challenge at 0, 6 and 24 hr With or Without BSE Intervention [ Time Frame: 0, 6 and 24 hours at Control visit and BSE visit (Day 4 of intervention) ]
    Change of total nasal cell count in response to a standard diesel exhaust particle (DEP) challenge was determined by counting the total number of cells (leukocytes) recovered from nasal lavage fluid at 0 hr (just prior to DEP dosing), 6 hr and 24 hr later in participants who consuming BSE for 4 days, or without consuming BSE (control). Nasal challenges were performed with 300 microgram a standard DEP in 200 microliter saline.

Information from the National Library of Medicine

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Ages Eligible for Study:   18 Years to 65 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Able and willing to provide informed consent
  • DEP responder as defined in protocol
  • Ability to refrain from consuming cruciferous vegetables 3 days prior to starting study and while on study. Cruciferous vegetables include: Broccoli, Kale, Chard, Kohlrabi, Brussels Sprouts, Parsley, Watercress, Daikon, Cabbage, Rutabagas, Cauliflower, Bok Choy, Arugula, Turnips, Radish, Mustard and Collard greens.
  • Allergy skin test positive to cat
  • Nonsmoker or ex-smoker of more than one year

Exclusion Criteria:

  • Smoking within past year or during study
  • Systemic corticosteroid or other immunosuppressive medication use in the previous 3 months or during study
  • Intranasal corticosteroid use in the previous month or during the study
  • Intranasal antihistamine or cromolyn use in the previous week or during study
  • Allergen immunotherapy during the previous 12 months or during study
  • Omalizumab use in the previous 12 months or during study
  • Systemic antihistamine or leukotriene modifying medication use in the previous week or during study
  • History of asthma or any current medical condition that in the opinion of the investigator may compromise the subject's ability to safely participate in the study
  • Baseline abnormality of hemoglobin, platelets, leukocytes, serum chemistries, liver function testing, or presence of proteinuria
  • A finding during physical examination that, in the opinion of the investigator may compromise the participant's ability to safely participate in the study
  • Pregnant or breast-feeding

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 ClinicalTrials.gov identifier (NCT number): NCT00882115

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United States, California
Los Angeles, California, United States, 90095
Sponsors and Collaborators
University of California, Los Angeles
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Study Chair: David Heber, MD, PhD UCLA Department of Medicine
Publications of Results:
Other Publications:
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Responsible Party: Zhaoping Li, Professor of Clinical Medicine, University of California, Los Angeles
ClinicalTrials.gov Identifier: NCT00882115    
Other Study ID Numbers: DAIT AADCRC-UCLA-01
First Posted: April 16, 2009    Key Record Dates
Results First Posted: November 15, 2018
Last Update Posted: September 20, 2019
Last Verified: September 2019
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No
Plan Description: There is no plan to share IPD with other researchers.
Keywords provided by Zhaoping Li, University of California, Los Angeles:
Broccoli Sprout Extract
Additional relevant MeSH terms:
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Anticarcinogenic Agents
Protective Agents
Physiological Effects of Drugs
Antineoplastic Agents