To Investigate the Safety, Pharmacodynamics and Effect on Allergic Reactivity of the Toll-like Receptor 7 (TLR7) Agonist GSK2245035 in Subjects With Respiratory Allergies

Inclusion Criteria: * Good general health, as determined by a responsible and experienced physician, based on a medical evaluation, including medical history, physical examination, laboratory tests and cardiac monitoring. A subject with a clinical abnormality or laboratory parameters outside the reference range for the population being studied may be included only if the investigator agrees that the finding is unlikely to introduce additional risk factors and will not interfere with the study procedures * Body weight \>=45 kilograms (kg) * History of symptomatic pollen- or perennial allergen- driven allergic rhinitis with or without mild asthma (with a clear link between exposure to allergen and development of symptoms) for more than 2 years * Positive skin allergy test (wheal \>=3 mm\[millimeters\]) or serum allergen-specific Immunoglobulin E (IgE) (\>=class 2) for perennial allergens and/or pollen allergens, relevant to the area of the research unit, within a year from the study start * Positive screening nasal allergen challenge, defined by a Total nasal symptoms score (TNSS) response of \>=5 (on a 12 point scale) and a decrease in Peak Nasal Inspiratory Flow (PNIF) of \>30% * Males and non-pregnant or non-lactating females between 18 and 65 years of age inclusive at the time of signing the consent form * A female subject is eligible to participate if she is of non-childbearing potential, defined as pre-menopausal females with a documented tubal ligation or hysterectomy, or postmenopausal, defined as 12 months of spontaneous amenorrhea (in questionable cases a blood sample with simultaneous follicle stimulating hormone (FSH) \>40 million international units (MIU)/mL and estradiol \<40 picogram (pg)/mL (\<147 picomoles (pmol)/liter (L) is confirmatory). Females on hormone replacement therapy (HRT) and whose menopausal status is in doubt will be required to use one of the contraception methods with a failure rate of \<1% if they wish to continue their HRT during the study. Otherwise, they must discontinue HRT to allow confirmation of post-menopausal status prior to study enrollment. For most forms of HRT, at least 2-4 weeks should elapse between the cessation of therapy and the blood draw; this interval depends on the type and dosage of HRT. Following confirmation of their post-menopausal status, they can resume use of HRT during the study without use of a contraceptive method * A female subject is eligible to participate if she is of child-bearing potential and has a negative early pregnancy test at screening, confirmed menses and/or a negative early pregnancy test within 10 days prior to the first dosing visit, a negative early pregnancy test before each dosing and agrees: to use one of the required contraception methods with a failure rate of \<1% starting at least 2 weeks prior to the start of dosing to sufficiently minimize the risk of pregnancy at that point. The subject must agree to use contraception until four days after the last dosing; or has only same-sex partners, when this is her preferred and usual lifestyle * Male subjects with female partners of child-bearing potential must agree to use one of the contraception methods: Condom plus partner use of a required highly effective contraceptive (with a failure rate of \<1%); or Abstinence, defined as sexual inactivity consistent with the preferred and usual lifestyle of the subject. Periodic abstinence (e.g. calendar, ovulation, symptothermal, post-ovulation methods) and withdrawal are not acceptable methods of contraception. This criterion must be followed from the time of the first dose of study medication until four days after the last dosing Exclusion Criteria: * CRITERIA BASED UPON MEDICAL HISTORIES * History of immunological disorders or other diseases (including, but not limited to, malignancy, cardiovascular, gastro-intestinal, hepatic, renal, hematological, neurological, endocrine or pulmonary disease) that in the opinion of the investigator and GlaxoSmithKline (GSK) medical monitor may pose additional risk factors * Nasal conditions that according to the opinion of the investigator may affect the outcome of the study, i.e. nasal septal perforation, nasal polyps, other nasal malformations or history of frequent nosebleeds * Respiratory tract infection within 4 weeks prior to the first dosing * History of regular alcohol consumption within 6 months of the study defined as: an average weekly intake of \>21 drinks for males or \>12 drinks for females. One drink is equivalent to 12 grams (g) of alcohol: 12 ounces (360 mL) of beer, 5 ounces (150 mL) of wine or 1.5 ounces (45 mL) of 80 proof distilled spirits * History of drug or other allergy that, in the opinion of the investigator or GSK medical monitor, contraindicates participation in this study * Serious asthma exacerbation requiring hospital visit and/ or treatment with oral steroids or high doses of inhaled steroids within 6 weeks prior to screening * Subjects with a history of treatment with allergen-specific immunotherapy within the past 5 years are excluded. (Subjects who received incomplete treatment with allergen-specific immunotherapy more than 5 years ago may be included at the discretion of the investigator and GSK Medical Monitor) * Use of prescription or non-prescription drugs, including vitamins, herbal and dietary supplements (including St John's Wort) within 7 days prior to first dosing and throughout the treatment and follow-up period unless in the opinion of the investigator and/or GSK medical monitor the medication will not interfere with the study procedures or compromise subject safety. Acetaminophen is an exception and will be permitted at daily doses of up to 2 g from screening to follow-up. Approved contraceptives and pre-approved medications as specified in the protocol are also exempt * Subjects using steroid treatment for allergic rhinitis and/or asthma may participate in the study if they can remain free of medication throughout the treatment and follow-up period starting from the following periods of time prior to screening: Nasal steroids-4 weeks, Oral steroids-12 weeks, Inhaled steroids-4 weeks * Subjects using other medications for their allergic rhinitis and/or asthma on an as needed basis may participate in the study if they can abstain from: Xanthines (including theophylline, but not including caffeine), anticholinergics, cromoglycates, leukotriene antagonists, 5-lipoxygenase inhibitors and long-acting inhaled beta-agonists from 1 week prior to screening and throughout the treatment and follow-up period; Nasal antihistamines-48 hours prior each visit; Oral antihistamines-76 hours prior each visit; Nasal decongestants-24 hours prior each visit; Oral decongestants-24 hours prior each visit; Short acting inhaled beta-agonists-48 hours prior each visit * CRITERIA BASED UPON DIAGNOSTIC ASSESSMENTS * A positive pre-study Hepatitis B surface antigen or positive Hepatitis C antibody result within 3 months of screening * A positive test for Human Immunodeficiency Virus (HIV) antibody * A positive screening or pre-dose drug/alcohol screen, with the following exceptions: (a) Subjects with positive results at the initial drug screening are excluded unless they have previously disclosed the use of a prescription drug that could cause a positive drug screen that according to the opinion of the Investigator and GSK Medical Monitor will not pose any safety risks to the subject and will not compromise the study (b) Subjects with a positive marijuana (THC) screen may be entered into the study at the investigator's discretion but all pre-dose drug screens must be negative (c) Subjects with a positive alcohol screen may have this test repeated at a subsequent screening visit but all pre-dose alcohol screens must be negative. * Pre-bronchodilator FEV1 \<=70% of predicted at screening * OTHER CRITERIA * Participation in a clinical trial with receipt of an investigational product within 3 months prior to the first dosing day. Subjects may only participate in this study once even though the study is being conducted in two separate allergy seasons * Exposure to more than four new chemical entities within 3 months prior to the first dosing day * Donation of blood or blood products in excess of 500 mL within a 56-day period * Subject is mentally or legally incapacitated * Unwillingness or inability to follow the procedures outlined in the protocol