Leprosy Skin Test Antigens Phase 1

Study Overview
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Brief Summary
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This is a small Phase I trial to evaluate the safety of the use as skin test antigens of the immunologically active proteins from the soluble/cytosol and insoluble cell wall of Mycobacterium leprae. The overall objective is to generate new leprosy skin-test antigens, equivalent to tuberculin-PPD in the tuberculosis context, to be used (I) for the early diagnosis of leprosy; and (ii) as epidemiological tools to measure the incidence of disease. Evaluating new leprosy skin test antigens may provide a better way to diagnose leprosy in its early stages of infection. With the early administration of drug therapy, infected individuals can then be cured of this disease before nerve damage occurs or nodules (lepromas) start to develop on the skin. Ten healthy, leprosy-unexposed, tuberculin-negative volunteers, 18-40 years old, from within the staff of the Mycobacteria Research Laboratories, Department of Microbiology, Colorado State University, Fort Collins, Colorado, will be selected.

Detailed Description
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This is a small Phase I trial to evaluate the safety of the use as skin test antigens of the immunologically active proteins from the soluble/cytosol and insoluble cell wall of Mycobacterium leprae. The overall objective is to generate new leprosy skin-test antigens, equivalent to tuberculin-PPD in the tuberculosis context, to be used (I) for the early diagnosis of leprosy; and (ii) as epidemiological tools to measure the incidence of disease. Evaluating new leprosy skin test antigens may provide a better way to diagnose leprosy in its early stages of infection. With the early administration of drug therapy, infected individuals can then be cured of this disease before nerve damage occurs or nodules (lepromas) start to develop on the skin. Ten healthy, leprosy-unexposed, tuberculin-negative volunteers, ages 18-40 years old, from within the staff of the Mycobacteria Research Laboratories, Department of Microbiology, Colorado State University, Fort Collins, Colorado, will be selected for this study. The volunteers will be recruited by direct contact after placing notices in the Department of Microbiology at Colorado State University. There are approximately 40 faculty/staff/students in this population and all are routinely tested (PPD skin-testing or chest X-ray) by the staff at the Hartshorn Health Service Center in the context of the Department's tuberculosis research. Five individuals will be selected for testing MLSA-LAM and five will receive MLCwA. Each will receive single 0.1 ml intracutaneous injections of three titrated doses (1, 10 and 25 )lg/ml) of the skin-test antigen, one of mock antigen (i.e., physiological saline), and one of control antigen (the product now in use; Rees MLSA, 10 )lg), divided equally between the subject's two arms. Results will be recorded at 15 min, 48 h, 72 h, and 28 days post-injection. The test dose will be administered with a sterile1 ml syringe calibrated in tenths and fitted with a sterile, one-half inch, 26 or 27 gauge needle. The rubber stopper of the vial will be wiped with a sterile piece of cotton moistened with alcohol and allowed to dry.It is expected that all concentrations of the two leprosy skin test antigens will evoke similar negative responses. If so, all three concentrations will be used for subsequent studies. This protocol is linked to study 98-202.

Official Title
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Phase I Study to Evaluate New Leprosy Skin Test Antigens: MLSA-LAM and MLCwA

Conditions
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Leprosy

Intervention / Treatment
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* Biological: MLCwA
* Biological: MLSA-LAM
* Other: Mock Antigen


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Born in the United States (less chance of previous exposure to tuberculosis or leprosy) Healthy individuals who are free of any evidence of leprosy or tuberculosis by established clinical examinations Between the ages of 18 and 40 years old Females of child-bearing age (defined from the period of menarche to menopause, usually between the ages of 15 to 45), certified as not pregnant (as determined by a pregnancy test performed within 7 days prior to admission into the study) Agreement to participate in the study after verbal explanation by the physician and nurses and signing of an informed consent form. Weight greater than 100 lbs. (female) and.140 lbs. (male) No known hypersensitivities or allergies Negative tuberculin skin test (as determined by skin tests performed 3 weeks prior to study entry) Exclusion Criteria: Pregnant or lactating females Oral corticosteroid treatment Chronic illness Immunosuppressive condition Tuberculosis Leprosy Age <18 or >40 Weight <100 lbs. (female) or <140 lbs. (male) Positive tuberculin skin test Extensive travel (2-3 trips/year) in leprosy/tuberculosis endemic regions

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 40 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Diagnostic
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Group 2<br>5 subjects will receive d single 0.1 ml intracutaneous injections of 3 titrated doses (1, 10, and 25 grams/ml) of MLCwA and one of mock antigen equally in two arms | Biological: MLCwA<br>* Antigen MLSA-LAM is a pellet extracted 3x followed by removal of SDS by column chromatography. Contains many of the same proteins<br>Biological: MLSA-LAM<br>* Antigen MLSA-LAM is derived from M. leprae extract following sonication and centrifugation, leaving the cytosol (MLSA). Contains soluble protein antigens of M. leprae<br>Other: Mock Antigen<br>* Physiological saline<br>|
| Experimental: Group 1<br>5 subjects received single 0.1 ml intracutaneous injections of 3 titrated doses (1, 10, and 25 grams/ml) of MLSA-LAM and one of mock antigen equally in two arms | Biological: MLCwA<br>* Antigen MLSA-LAM is a pellet extracted 3x followed by removal of SDS by column chromatography. Contains many of the same proteins<br>Biological: MLSA-LAM<br>* Antigen MLSA-LAM is derived from M. leprae extract following sonication and centrifugation, leaving the cytosol (MLSA). Contains soluble protein antigens of M. leprae<br>Other: Mock Antigen<br>* Physiological saline<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Range of concentration (1, 10, and 25 micrograms/ml) responses in the two leprosy skin test antigens in the control and mock antigens |  | Up to 28 days post injection | 
| Incidence of leprosy |  | Up to 28 days post injection | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Leprosy, skin test, MLSA-LAM, MLCwA, diagnosis, Protocol 98-202