A First-In-Human SAD and MAD Study to Evaluate the Safety, Tolerability, PK and PD of SC Administered ALTB-268 in Healthy Volunteers

Inclusion Criteria: 1. Written Informed Consent and willingness to comply with the study restrictions. 2. Sex: male or female volunteers. 3. Age: 18 to 55 years, inclusive, at screening. 4. Body mass index (BMI): 18.0 to 32.0 kg/m2, inclusive, at screening. 5. Weight: 50 kg to 110 kg, inclusive, at screening. 6. Healthy volunteers: Healthy status as defined by the absence of evidence of any clinically significant, in the opinion of the Investigator, active or chronic disease following a detailed medical and surgical history, a complete physical examination including vital signs, 12-lead ECG, hematology, blood chemistry, serology, and urinalysis Exclusion Criteria: 1. Males with female partners who are pregnant, lactating, or planning to become pregnant during this study or within 90 days after dosing of study drug. 2. Use of any investigational drug or device within 30 days or five half-lives whichever is longer, of the first dose of study drug. 3. Any disease which, in the opinion of the Investigator, poses an unacceptable risk to the volunteers. 4. Clinically significant history of any drug sensitivity, drug allergy, or food allergy, as determined by the Investigator (such as anaphylaxis, hepatotoxicity, or treatment with steroids or epinephrine). Confirmatory circumstances would include treatment with epinephrine or in emergency department.