A Study to Investigate GB-0895 in Adults With Mild to Moderate Asthma or COPD

Inclusion Criteria (Part A \& B, Asthma): * Participants must be able to give written consent * 18 to 65 years of age (inclusive) at the screening visit; * Diagnoses of mild to moderate asthma for ≥12 months * Laboratory blood values within the ranges outlined in the protocol Exclusion Criteria (Part A \& B, Asthma): * Other serious disease * Significant asthma exacerbations * Current smokers or ex-smokers with \>5 pack years smoking history * Pregnant or breastfeeding Inclusion Criteria (Part C, COPD): * Participants must be able to give written consent * 40 to 80 years of age (inclusive) at the screening visit; * Diagnoses of COPD for ≥12 months * Laboratory blood values within the ranges outlined in the protocol * Must be current or ex-smoker Exclusion Criteria (Part C, COPD): * Other serious disease * COPD exacerbation within 4 weeks of enrolling * Requires supplemental oxygen (CPAP for sleep apnea allowed) * Pregnant or breastfeeding