A kind of autophagy inhibitory polypeptide

Abstract

The invention relates to an autophagic inhibiting polypeptide which has an amino acid sequence of LPDISLKDLQFLQSFCPSEVQ. The polypeptide can be prepared by an artificial synthesis or host cell expression method, and can be used for preparing tumor treatment medicines. The autophagic inhibiting polypeptde only has 21 amino acids, can be easily and feasibly prepared by either artificially synthesizing or applying host cell expression, and is beneficial to large-scale popularization and utilization. The polypeptide is derived from inherent protein in a living body, cannot cause immune elimination in an animal experiment, has small toxicity to cells, and is more specific. The inhibiting polypeptide can be used for introducing a gene segment coding the polypeptide into a cell for stable expression through a lentivirus or transfection and other means, is convenient to operate, and is beneficial to researches for cell level and animal level.

Description

technical field [0001] The invention relates to the technical field of bioengineering, in particular to the preparation and application of an autophagy "switch" initiation protein complex polypeptide inhibitor. Background technique [0002] The autophagy pathway is a new target for tumor drug therapy. The classic autophagy process can be seen in figure 1 shown. In recent years, the idea that cancer cells "eat themselves to survive" suggests that autophagy may play an important role in tumorigenesis and progression. For example, before the formation of abundant blood vessels around tumor cells, the nutrients produced by the autophagic degradation pathway can provide energy for tumor cells, thereby maintaining their survival under extreme stress and lack of nutrients. A large number of other studies have confirmed that the number of autophagosomes usually increases after the use of anticancer drugs and X-ray irradiation in some tumor cells, and the degree of increase is posi...

AI Technical Summary

Problems solved by technology

In addition, chloroquine has low specificity in inhibiting autophagy, and it also has other biological functions, such as chloroquine can prevent DNA replication and RNA transcription, which may become potential factors for poor prognosis and adverse reactions in patients, thus limiting the potential of chloroquine. clinical application

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