Study BTI-101 is a Phase 1, randomized, double-blind, placebo-controlled, dose escalation, parallel design study to evaluate the safety, tolerability, and pharmacokinetics of IV rhu-pGSN or saline placebo administered as 5 doses each of 6, 12, 18, or 24 mg/kg of body weight. Each of 4 dosing cohorts will include 8 subjects randomized 3:1 rhu-pGSN:placebo (6 rhu-pGSN subjects:2 placebo subjects). Subjects will be healthy adult volunteers 18-55 years of age.

Doses will be administered at 0 hours (Day 1), 12 hours (Day 1), 36 hours (Day 2), 60 hours (Day 3), and 84 hours (Day 4). Subjects will be kept in-house until after the last blood sample is taken on Day 5. Subjects will return for follow-up 7 days after the initiation of therapy (Day 8) and on Day 28 for the End-of-Study (EOS) Visit. After each cohort has completed the Day 8 visit, review of the safety results (including labs) will be conducted (and unblinded where appropriate) before the initiation of the next higher dose cohort.

To assess safety and tolerability, subjects will undergo physical examinations (including vital sign measurements), adverse event (AE) assessments, concomitant medication assessments, and safety laboratory testing. Blood samples will be collected for analysis of pGSN levels and antibodies against pGSN.

Inclusion Criteria:

1. Healthy male or female adults 18 to 55 years of age without chronic or active acute medical conditions
2. Informed consent obtained from subject
3. Weight ≤100 kg and body mass index (BMI) <30 kg/m2
4. Willingness to use contraception during the course of the study, starting at screening and for at least 3 months after their final study treatment

Exclusion Criteria:

1. Pregnant or lactating women
2. Acute illness during the month prior to screening
3. Circumstances that may require any medications (including prescription medication, over-the-counter medication, vitamins, or supplements) during the during the inpatient days of the study other than acetaminophen
4. Hospitalization during the year prior to screening
5. History of cancer or treatment with systemic chemotherapy or radiation therapy at any time
6. Transplantation of hematopoietic or solid organs
7. History of diabetes mellitus; myocardial infarction, angina, or other cardiovascular disease; stroke or cerebrovascular disease; chronic obstructive pulmonary disease (COPD) or asthma; deep vein thrombosis (DVT)/pulmonary embolism (PE); liver or kidney disease; clinically significant psychiatric condition; or active or chronic infection
8. Receipt of blood products during the year prior to screening
9. Chronic mechanical ventilation or dialysis
10. Any clinically significant abnormalities in clinical chemistry, hematology, or urinalysis results as judged by the Investigator
11. Any clinically significant abnormalities of vital signs, EKG or physical examination findings as judged by the Investigator
12. Positive results for recreational drugs during screening
13. Any other condition deemed by the Investigator as possibly interfering with the conduct of the study

From the first study intervention to 4 weeks

Doses prepared by unblinded pharmacist. Placebo and Drug are undistinguishable in syringe for administration.