A Clinical Trial to Evaluate the Safety, Tolerability, Pharmacokinetics, Immunogenicity, and Pharmacodynamics of HRS-4139 in Healthy Participants

Inclusion criteria

• Participants who understand the specific procedures of the trial, voluntarily agree to participate in this trial, and provide written informed consent.
• Participants aged 18 to 55 years (inclusive) at screening.
• Male body weight ≥ 50 kg, female body weight ≥ 45 kg, and body mass index (BMI) between 18.0 and 26.0 kg/m² (inclusive).
• Participants who are able to communicate effectively with the investigator, fully understand and comply with all requirements of the trial protocol.

Exclusion criteria

• Participants with any disease of the circulatory, endocrine, neurological, digestive, respiratory, hematologic, immunologic, psychiatric, or metabolic systems, or any other condition that may interfere with the trial results.
• Participants with a history of malignancy.
• Participants with a history of risk factors for Torsades de Pointes (e.g., heart failure, hypokalemia), or with short QT syndrome or long QT syndrome, or with a family history in first-degree relatives of unexplained sudden death, drowning, or sudden infant death syndrome (SIDS) occurring at ≤ 40 years of age.
• Participants who have had an opportunistic infection within 6 months prior to screening; or who have a known history of recurrent or chronic infections, or who have had chronic or recurrent sinusitis, tonsillitis, urinary tract infections, prostatitis, enteritis, etc.
• Participants who have had an acute infection with systemic symptoms requiring systemic anti-infective therapy (intravenous or oral) within 4 weeks prior to screening.
• Participants who have participated in any clinical trial of a drug or medical device within 3 months prior to screening, where participation is defined as having signed the informed consent and having received the investigational drug or medical device; or Participants who are still within the follow-up period of any clinical study or within 5 elimination half-lives of the study drug at the time of screening, whichever is longer.
• Participants who have used any medication (including prescription drugs, over-the-counter medications, Chinese herbal medicines, dietary supplements, etc.) within 2 weeks or within 5 elimination half-lives (whichever is longer) prior to the administration of the study drug; or Participants who plan to use any other medication during the study period.
• Participants who have received a live (attenuated) vaccine within 1 month prior to screening or plan to receive such a vaccine during the trial period, with the exception of influenza vaccination.
• Participants who have experienced severe trauma or undergone major surgery within 6 months prior to screening, or who plan to undergo surgery during the trial period.
• Participants who have donated blood or experienced significant blood loss (≥ 400 mL) within 1 month prior to screening, or who have received a blood transfusion within 2 months prior to screening.