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Cytotoxic humanized anti-TRBV9 monoclonal antibody. We performed first-in-human targeted depletion of TRBV-restricted T cells in an HLA–B*27-positive patient with AS. TCR repertoires Preparation of unique molecular identifier (UMI)-labeled TCRβ cDNA libraries was performed using HUMAN TCR RNA MULTIPLEX kit (MiLaboratories) according to the manufacturer's manuals. Sequencing was performed on Illumina MiSeq and NextSeq 550, using 150+150 nt paired-end mode. MIGEC v1.2.9 was used for UMI-based read grouping and error correction. MiXCR v3.0.13 was used for extraction of TCRβ CDR3 repertoires. VDJtools v1.2.1 was used for downstream post-analysis. The repertoires include only productive sequences with more than one read per UMI.

Cytotoxic humanized anti-TRBV9 monoclonal antibody. A single intravenous (i.v.) dose of the antibody administered to rhesus macaques (Macaca mulatta), resulted in prominent depletion of peripheral blood TRBV9+ T cells in a dose-dependent manner. Animals After quarantine, 12 Macaca mulatta males aged 5–8 years were selected for this experiment. For TCR repertoire profiling peripheral blood samples were collected before and 3, 40, 150, and 300 days after a single administration of BCD-180. We divided the animals into two groups (n = 4 for each group) that received 1 mg or 10 mg BCD-180 i.v. per animal, along with a control group that included four animals and received human intravenous IgG immunoglobulins (Microgen). Animals were kept in accordance with the guidelines for accommodation and care of laboratory animals, with species-specific provisions for nonhuman primates. The local ethics committee approved experiments for these studies. TCR repertoires Sequencing was performed on Illumina HiSeq1500. MIGEC v1.2.9 was used for UMI-based read grouping and error correction. MiXCR v3.0.13 was used for extraction of TCRβ CDR3 repertoires. VDJtools v1.2.1 was used for downstream post-analysis. The repertoires include only productive sequences with more than one read per UMI.

Cytotoxic humanized anti-TRBV9 monoclonal antibody. We performed first-in-human targeted depletion of TRBV-restricted T cells in an HLA–B*27-positive patient with AS. TCR repertoires Preparation of unique molecular identifier (UMI)-labeled TCRβ cDNA libraries was performed using HUMAN TCR RNA MULTIPLEX kit (MiLaboratories) according to the manufacturer's manuals. TRBV9-focused TCRβ cDNA libraries were prepared using an adapted version of the HUMAN TCR RNA MULTIPLEX kit (MiLaboratories). Sequencing was performed on Illumina MiSeq and NextSeq 550, using 150+150 nt paired-end mode. MIGEC v1.2.9 was used for UMI-based read grouping and error correction. MiXCR v3.0.13 was used for extraction of TCRβ CDR3 repertoires. VDJtools v1.2.1 was used for downstream post-analysis. The repertoires include only productive sequences with more than one read per UMI.