Development of Human Nasal Challenge Models With Microbial Constituents and Grass Pollen

STUDY DESIGN AND METHODOLOGY

The study involves 3 parts with different nasal spray challenges being administered to subjects:

1. Bacterial or viral components, comprising one of the following in a particular patient;
2. MPLA (monophosphoryl lipid A) resembles bacterial lipopolysaccharide
3. PolyIC (polyinosinic and cytidylic acids): viral component
4. PolyICLC (polyIC stabilised with polyLlysine): viral component
5. Resiquimod: viral mimic
6. Tuberculin: partially purified protein derivative (PPD) from Mycobacterium bovis, the bacteria that causes TB.
7. Allergen: The nasal spray challenge agent is Timothy grass pollen.

RECRUITMENT

The aim is to recruit a total of 174 subjects. Subjects will be identified through advertisements in the newspapers, posters on the campus, GP services, outpatients clinics at St. Mary's hospital including TB clinics at St. Mary's Hospital. We will gain fully informed consent. All data will be managed as per GCP and local Information Governance guidelines.

NUMBER OF SUBJECTS AND DOSING

PART 1: Nasal ascending dose challenge with microbial constituents using MPLA, polyIC, polyICLC and resiquimod. This is divided into part A and part B.

PART 1A (n=32): Incremental Ascending Dose Study based on Tolerability and SAM. 4 cohorts of 8 healthy volunteers (4 of 8 with allergies to grass pollen, house dust mite, or history of hay fever). One cohort for each microbial constituent. Each cohort will be given a nasal saline control challenge and three ascending doses of the nasal microbial constituent challenge:

• 10μg of microbial constituent in 100μl of saline
• 100μg of microbial constituent in 100μl of saline
• 500μg of microbial constituent in 100μl of saline

PART 1B (n=64): Single Top Dose with Additional Special Sampling Probe (SSP) and Curettage, Single Cohort of up to 16 Healthy Volunteers (8 of 16 allergies to grass pollen, housedust mite, history of hay fever). Each subject given saline control and single top dose after establishing tolerability \& SAM response.

RESIQUIMOD:

Part B will see 10μg per nostril being given to 36 volunteers:

12 allergic asthmatics 12 atopic volunteers 12 non-atopic volunteers

PART 2: Nasal ascending dose challenge with tuberculin. This is divided into part A and part B.

PART 2A (n=16): This comprises a total of 16 latent TB (LTB) subjects,This group is subdivided into 4 cohorts of 4 subjects according to the dose of the tuberculin being administered;

• 0.1 TU in 100μl, n = 4
• 1.0 TU in 100μl, n = 4
• 2.0 TU in 100μl, n = 4
• 5.0 TU in 100μl, n = 4 Each cohort has only 1 challenge. The starting dose is very low at 0.1 TU. If it is well tolerated, the subject will proceed to the next higher dose of 1.0 TU. If this is also well tolerated, the subject will proceed to the next higher dose of 2.0 TU and then to the highest dose of 5.0 TU in this group ensuring the safety of subjects at all times.

PART 2B (N=16): Top dose with additional sampling. This comprises of 16 people in two groups (8 healthy volunteers and 8 subjects with latent TB).

Group 1: Latent TB subject, no. of people = 8 This group will receive the top dose (5-10.0 TU) of the tuberculin challenge. Out of the 8 subjects in each group, 2 will receive placebo (saline dummy spray) and the remaining 6 will be given the tuberculin spray challenge.

Group 2: Healthy volunteers, no. of people = 8 This group will also receive the top dose (5-10.0 TU) of the tuberculin challenge, subject to tolerability. Out of the 8 subjects, 2 will receive the placebo (saline dummy spray) and the remaining 6 will be given the tuberculin spray challenge

PART 3 (n=46): Nasal Allergen Challenge with Timothy Grass Pollen

Initially 30 people shall be studied: one group of 12 people have hay fever, one group of 12 people have asthma with grass pollen allergy, and a group of 6 people are nonallergic and do not have asthma. In an additional group,16 people with hay fever shall be studied by taking continuous samples of the surface nasal lining fluid using a special sampling probe (SSP) following the nasal spray challenge.

1. Group 1: people with hay fever, n = 12
2. Group 2: people with allergic asthma, n = 12
3. Group 3: healthy, nonatopic people, n = 6
4. Additional Group 4: people with hay fever, n=16

NASAL PROCEDURES IN THE STUDY

1. Nasal washing (nasal lavage): At the start of the day, nasal washings in the nose will be carried out by passing a small volume of salt water (saline) fluid into the nose. This procedure is carried out before other procedures to clean up the nose. The fluid obtained from the nasal washings is discarded and not analysed.
2. Nasal lining fluid absorption (nasosorption or SAM): A small strip of absorbent material, that looks and feels like soft tissue paper, will be used to absorb moisture from the inside surface of the nostril. The special absorptive paper will be placed inside the nostril and left for a period of 2 minutes to absorb the nasal lining fluid before being removed, gently sucking up fluid like blotting paper. Putting the paper into the nose can tickle, and cause your eyes to water a little. However, the nasosorption does not hurt and our method has proved to be well tolerated in babies, children and adults. The paper absorbs the nasal fluid and many substances produced by the nasal cells can then be extracted from the paper and measured in the laboratory.
3. Nasal scrape (nasal curettage or Rhinoprobe): A small sterile disposable plastic probe will be inserted into the nose and will be gently pressed against the inside surface lining of the nostril. The 3 inch long probe has a tiny scoop on the end, which can barely be see. 24 tiny samples from each nostril (a pinhead, 2mm, of tissue) will be taken from a part of the nose that has a reduced nerve supply to limit any discomfort. Taking this sample does not cause bleeding, but may cause some mild discomfort, and may make the eyes water slightly. The probe will collect nasal cells from the surface of the nostril which will then be sent for analysis. This method has been performed on many adults, children, and babies, and has been very well tolerated.
4. Special Sampling Probe (SSP): The nasal surface lining fluid may also be collected using a special sampling probe or SSP that uses an electrospray to bounce droplets off the nasal lining fluid. This will be done by continuously sampling for a few hours from a single nostril. When using this special sampling probe (SSP) in people's noses, there is a slight tickling sensation while the sample is being taken. This can barely be noticed.

STATISTICAL ANALYSIS

The distribution of data will be assessed by the ShapiroWilks test, which determines whether the data has a normal (parametric) or non-normal (non-parametric) distribution.

Normal data will be displayed graphically as:

• arithmetic means and standard error of means (SEM)
• or means with SDs
• or means with confidence intervals (CIs)

Non-normal data will be displayed graphically as:

Box-whisker: median, quartiles, range

For non-normal data the differences from baseline will be measured for active challenge agent (at different doses) and placebo at each time point, and the AUC calculated. The differences in AUC from placebo (active placebo) are calculated, and the significance tested with the nonparametric Wilcoxon signed rank test(single population). Area under the curve (AUC) shall be sued over different defined times depending on the nasal challenge agent.