Abstract: This invention is a fuel engine piston with an installed bearing and belongs to the field of automotive engine components, specifically relating to a piston for a fuel engine. It includes a piston body, outer arc bearings, pin shaft bolts and sealing rings. It provides a piston for a fuel engine with bearings. The bearings on the piston enable rolling friction during piston operation, replacing sliding friction. This reduces the friction between the piston and the engine cylinder liner, decreases the energy consumption required to overcome friction, and reduces wear on the piston caused by sliding friction.

Abstract: Provided is an engineered T cell. The expression of a TCR/CD3 complex on the cell surface is reduced by means of introducing a polypeptide that down-regulates the expression of the TCR/CD3 complex on the cell surface into the cell. The engineered T cell can be used for therapeutic purposes, such as treatment of cancers.

Abstract: Provided are a chimeric antigen receptor, a construction method therefor and an application thereof. The chimeric antigen receptor consists of an antigen binding domain, an extracellular hinge region, a transmembrane domain, a co-stimulatory domain and a CD3z signaling domain. Further provided is a CAR-T cell which comprises two chimeric antigen receptors containing different antigen binding domains, and which is bispecific and exhibits increased cell killing efficiency and a better tumor inhibitory effect in vivo.

Abstract: Provided is an engineered T cell. A polypeptide down-regulating the expression of a TCR/CD3 complex on cell surface is introduced to reduce the expression of the TCR/CD3 complex on the cell surface. The engineered T cell can be used for therapeutic purposes, such as cancer treatment.

Abstract: Provided are allogeneic CAR-T cells prepared by expressing related functional proteins in T cells and regulating HLA class I molecules on the cell surface. Also provided is the use of the allogeneic CAR-T cells.

Abstract: Provided is an engineered T cell. The expression level of an HLA class I molecule on the surface of the T cell is down-regulated to 10-50% of that of a non-engineered T cell. The expression of the T cell down-regulates a functional protein of the HLA class I molecule. The functional protein down-regulates at least one of HLA-A, HLA-B, and HLA-E molecules of the HLA class I molecule. The T cell may be an allogeneic CAR-T cell. Also provided is an application of the T cell or the allogeneic CAR-T cell.