A Study to Evaluate the Safety of SHR-7590 in Chinese Healthy Participants and in Patients With Moderate-to-severe Inflammatory Bowel Disease

Inclusion Criteria:

\- Part 1

* Voluntarily signed the informed consent form
* Age from 18 to 55 years old
* Body weight ≥45 kg, body mass index (BMI) 18-26 kg/m2
* Normal or clinically insignificant vital signs, physical examination, laboratory examination and other examinations
* Adopt efficient contraceptive measures

Exclusion Criteria:

\- Part 1

* Suspected allergy to the study drug or any component of the study drug
* Any clinical disease or any other disease that could interfere with the test results
* Had a history of malignant tumor
* Had an opportunistic infection within 6 months before screening
* Acute infection with constitutional symptoms within 4 weeks before baseline
* Participants who participated in any drug or device clinical trial within 3 months before screening
* Use of any drug within 1 month before the use of the investigational drug
* Patients who had used immunosuppressant or anti-interleukin antibody drugs within 6 months before screening
* Had major trauma or major surgery within 6 months before screening, or were scheduled to undergo surgery during the trial
* History of blood donation within 1 month before screening, or severe blood loss