Safety, Tolerability, Pharmacokinetics and Pharmacodynamics of SPG302 in Healthy Volunteers and ALS Participants

This study is a Phase 1 randomized, double-blind, placebo-controlled, single, and multiple ascending dose study in HV with food effect cohort, and a repeat dose expansion cohort(s) in participants with ALS. The study consists of 3 parts, as follows: - Part 1: SAD in HV with up to 6 cohorts including a food effect cohort. - Part 2: MAD over 5 days in HV with up to 5 cohorts - Part 3: ALS cohorts with once daily (QD) dosing over 28 day cycles

Inclusion Criteria:
- Age 18-55
- Must be in good health with no significant medical history
- Clinical laboratory values within normal range or < 1.2 times ULN
- BMI 18-32 (inclusive)
- Contraceptive use by men or women consistent with local regulations
- Able and willing to provide written informed consent
Exclusion Criteria:
- Any physical or psychological condition that prohibits study completion
- Known cardiac disease
- Active or history of malignancy in the past 5 years
- Serious infection within 1 month of screening
- Acute illness within 30 days of Day 1
- Surgery, bone fracture, or major musculoskeletal injury in the past 3 months
- History of suicidal behavior or suicidal ideation
- Active cigarette smokers and users of nicotine-containing products
- HIV, hepatitis B and hepatitis C positive
- SBP >140 or <90
- DBP >90 or <40
- HR 100
- QTcF >450ms, cardiac arrhythmia, or clinically significant abnormal ECG
- Prescriptions, over-the-counter, or herbal medication within 7 days
- Vaccines within 14 days
- Other investigational products within 30 days
- Blood donation within 30 days
- Plasma donation within 7 days
- Pregnant or breastfeeding
- Otherwise unfit, on metabolic-altering lifestyle/diet, positive urine drug screen or
intake of alcohol or caffeine-containing products
ALS Cohort Inclusion Criteria:
- Age 18-80
- ALS TRICALS risk score
- Stable dose of standard of care treatment
- Contraception use by men or women consistent with local regulations
- Able and willing to provide written informed consent
ALS Cohort Exclusion Criteria:
- Underlying physical or psychological condition prohibiting study completion
- Known cardiac disease
- Active or history of malignancy in the past 5 years
- Serious infection within 1 month of screening
- Acute illness within 30 days of Day 1
- History of suicidal behavior or suicidal ideation
- Active cigarette smokers and users of nicotine-containing products
- Neurodegenerative disease
- External respiratory support or supplemental oxygen requirement
- HIV, hepatitis B and hepatitis C positive
- SBP >140 or <90
- DBP >90 or <40
- HR 100
- QTcF >450ms, cardiac arrhythmia, or clinically significant abnormal ECG
- Vaccines within 14 days
- Other investigational products within 30 days
- Blood donation within 30 days
- Plasma donation within 7 days
- Pregnant or breastfeeding
- Otherwise unfit