A Study to Assess the Safety and PK/PD of LBL-047 in Healthy Adults and Patients With Systemic Lupus Erythematosus

A Double-blind, Randomized, Placebo-controlled, Dose-escalation Phase I Study to Assess the Safety and PK/PD of LBL-047 Subcutaneous Injection in Healthy Adults and Patients with Systemic Lupus Erythematosus.

Inclusion Criteria: 1. Agree to follow the trial treatment regimen, visit schedule, laboratory test, and other requirements of the protocol, and voluntarily enroll in the study and sign the written informed consent. 2. Age 18-60 years (inclusive of boundaries) at the time of signing informed consent form. 3. Part A:Determined by the investigator to be in good health at the time of signing the ICF. 4. Part B:Mild to moderate systemic lupus erythematosus: SLEDAI-2K score ≥4 and ≤ 10 at screening. 5. Females of childbearing potential are willing to use highly effective contraception during the study and for 6 months after administration of the study drug and to avoid egg donation.Women of non-childbearing potential include: those with documented surgical sterilization or documented menopause. 6. Male of childbearing potential are willing to use highly effective contraception during the study and for 6 months after study drug administration and to avoid sperm donation.Men without fertility potential include those with: A semen sample investigation that confirms azoospermia, definitive evidence of infertility, or a history of vasoligation.For the purpose of this study, men with a "low sperm count" (or "subfertility") are not considered infertile. Exclusion Criteria: 1. Part A:Symptoms or history of any significant disease, including but not limited to cardiovascular, hepatic, renal or any other disease that may interfere with the study results. 2. Part A:Abnormalities with clinical significance were indicated by vital signs, physical examination, laboratory test, 12-lead electrocardiogram (ECG), chest X-ray, and abdominal ultrasound. 3. Part B:History of organ transplant or hematopoietic stem cell/bone marrow transplant. 4. Part B:currently receiving treatment for any chronic infection (such as pneumocystosis, cytomegalovirus, herpes simplex virus, herpes zoster and atypical mycobacteriosis). 5. Major surgery (as judged by the investigator) within 90 days prior to dosing, or surgery scheduled during the study. 6. At screening, women of childbearing potential were positive for pregnancy.follicle stimulating hormone (FSH) did not reach postmenopausal level in postmenopausal women (defined as amenorrhoea ≥ 12 months before screening). 7. Large tattoo, scar or other condition that may interfere with assessment at the injection site. 8. unable to tolerate venipuncture, difficulty in blood collection or has a history of needle/blood phobic disorder. 9. The investigator determines that there are other conditions unsuitable for participation in this study.