AC0058TA is a small molecule compound that potently, selectively and irreversibly inhibits Bruton's tyrosine kinase (BTK) phosphorylation and downstream signals, resulting in inhibition of inflammatory cytokine production in monocytes and inhibition of lymphocyte activation (predominantly B-cell activation) in the preclinical studies. The nonclinical program has demonstrated that AC0058TA has the potential to interfere with signaling functions mediated by tyrosine kinases and may be useful for controlling excessive or aberrant T- and B-cell activation in autoimmune diseases.

As an investigational targeted therapy for RA and SLE, AC0058TA is expected to address the unmet need of this patient population, for whom there are currently no effected therapies and there is a great unmet medical need, AC0058TA may inhibit the key pathway which involves the disease process.

This is a 2-part, randomized, double-blind, placebo-controlled, single-dose-escalation (Part 1) and multiple-dose-escalation (Part 2) study to evaluate the safety, tolerability, PK, and PD of AC0058TA administered orally to healthy subjects. Part 1 of the study will also to evaluate the effect of food on the pharmacokinetics of a single oral dose of AC0058TA.

Inclusion Criteria:

• Male or female, of any ethnic origin, age ≥18 and ≤65 years of age;

• BMI ≥18.5 and ≤32.0 kg/m2;

• Medical history without major pathology and determined to be in good health with no clinically significant findings as assessed by the Investigator;

• All clinical laboratory tests of blood and urine are within the normal range or show no clinically relevant deviations as judged by the Investigator;

• A female must be

  • postmenopausal (ie, have spontaneous amenorrhea for ≥12 consecutive months with follicle stimulating hormone (FSH) ≥40 mIU/mL at Screening, and be of an appropriate age) or
  • surgically sterile (ie, hysterectomy, bilateral salpingectomy, bilateral oophorectomy, tubal occlusion) for at least 90 days prior to Screening;

• Male subjects must agree to use at least 2 methods of contraception with a female partner of childbearing potential, with at least 1 method being a highly effective method of contraception (as defined in Section 5.5), to refrain from sperm donation, and to refrain from unprotected sexual intercourse with a female who is pregnant or breastfeeding during the study from the time of signing the informed consent or 10 days prior to Check-in (Day -1) until 90 days after the last administration of study medication or discontinuation;

• Able to comprehend and abide by the study restrictions, and willing to sign an Informed Consent Form (ICF)

Exclusion Criteria:

• Has a significant history or clinical manifestation of any metabolic, allergic, dermatological, hepatic, renal, hematological, pulmonary, cardiovascular, gastrointestinal, neurological, respiratory, endocrine, immune suppressive/defective, or psychiatric disorder as determined by the Investigator;
• Has a history of significant hypersensitivity, intolerance, or allergy to any drug compound, food, or other substance, unless approved by the Investigator;
• Has a history of stomach or intestinal surgery or resection that would potentially alter absorption and/or excretion of orally administered drugs (a subject who has had an appendectomy or hernia repair may be enrolled in the study);
• Has a history of congenital nonhemolytic hyperbilirubinaemia (eg, Gilbert's syndrome);
• Has a history of alcoholism or drug addiction within 1 year prior to Check-in;
• Has a positive test for selected drugs of abuse at Screening (not including alcohol) or Check-in (including alcohol);
• Has a positive hepatitis panel and/or positive human immunodeficiency virus (HIV) antibody screens;
• Has a positive pregnancy test result at Screening or Check-in (females only);
• Has clinically significant findings as determined by the Investigator (eg, medical history, 12-lead ECG, vital signs, or clinical laboratory evaluations;
• Has participated in any other investigational drug trial in which receipt of an investigational drug (new chemical entity) occurred within 5 half-lives of the respective study drug or 30 days prior to Check-in, whichever is longer;
• Has used any medications/products, including St. John's Wort, known to alter drug absorption or elimination processes within 30 days prior to Check-in, unless deemed acceptable by the Investigator;
• Has used any prescription medications/products not discussed in another exclusion criterion within 14 days prior to Check-in, unless deemed acceptable by the Investigator;
• Has used slow-release medications/products considered to still be active within 14 days prior to Check-in, unless deemed acceptable by the Investigator; 14. Has used any over-the-counter, nonprescription medications/products not discussed in another exclusion criterion (including vitamins, minerals, and phytotherapeutic/herbal/plant-derived preparations) within 7 days prior to Check-in, unless deemed acceptable by the Investigator;
• Has donated blood within 30 days prior to Screening, plasma within 2 weeks prior to Screening, or platelets within 6 weeks prior to Screening;
• Has received blood products within 2 months prior to Check-in;
• Has poor peripheral venous access;
• Who, in the opinion of the Investigator, should not participate in this study.