A synthetic peptide sp2 has the amino acid sequence shown in SEQ ID No. 1. sp2 has obvious anti-tumor growth activity on xenograft tumours such as subcutaneous human pancreatic cancer, human cervical cancer, and human ovarian cancer in nude mice, with a dose-effect and time-effect relation; and has the effect of delaying metastasis and prolonging the survival time of nude mouse having in situ transplantation of human pancreatic cancer and lung adenocarcinoma. After the animals were given intravenous injection of sp2 at a dose of 2000 mg/kgBW, no toxicity reaction and death were observed. The applications of sp2 also include: (1) preventing and/or treating of tumor; (2) inhibiting proliferation and/or growth and/or invasion of tumor cells; (3) enhancing the anti-tumor immune response; (4) inducing tumor cell differentiation; (5) preparing anti-tumor drugs; (6) inhibiting tumor telomerase activity; and (7) regulating the tumor cell cycle.

Peptides that home, target, migrate to, are directed to, are retained by, or accumulate in and/or bind to the cartilage or kidney of a subject are disclosed. Pharmaceutical compositions and uses for peptides or peptide-active agent complexes comprising such peptides are also disclosed. Such compositions can be formulated for targeted delivery of an active agent to a target region, tissue, structure or cell in the cartilage. Targeted compositions of the disclosure can deliver peptide or peptide-active agent complexes to target regions, tissues, structures, or cells targeted by the peptide.

The present invention provides a vaccine containing a complex of a peptide consisting of the amino acid sequence of SEQ ID NO: 1 and an epitope of a disease-causing biological protein such as DPP4, IL-17A, IgE, S100A9 or PCSK9, which vaccine uses a less antigenic carrier protein and is capable of inducing antibody production to serve as an effective vaccine.

Peptide-immuno-oncology agent complexes (“peptide-I/O complexes”) that can home, target, migrate to, are directed to, are retained by, accumulate in, penetrate, or bind to the tumor microenvironment, tumor tissues, or cells or compartments or cytosol of cells thereof, or any combination thereof, are disclosed. Additionally disclosed are peptide-I/O complexes that can cross the blood-brain barrier. Pharmaceutical compositions and uses for peptide-I/O complexes comprising such peptides are also disclosed. Such compositions can be formulated for targeted delivery of an immuno-oncology agent (“I/O”) to the tumor microenvironment. Targeted compositions of the disclosure can deliver peptide-I/O complexes to target regions, tissues, structures or cells targeted by the peptide.

The present invention provides a vaccine containing a complex of a peptide consisting of the amino acid sequence of SEQ ID NO: 1 and an epitope of a disease-causing biological protein such as DPP4, IL-17A, IgE, S100A9 or PCSK9, which vaccine uses a less antigenic carrier protein and is capable of inducing antibody production to serve as an effective vaccine.

A scorpion venom heat-resistant synthetic peptide (SVHRSP) contains an amino acid sequence of SEQ ID NO 1. One or more amino acids the amino acid sequence can be substituted or deleted. A pharmaceutical composition that contains the SVHRSP has numerous applications. The pharmaceutical composition can be used to protect neuronal cell against amyloid beta-induced toxic effects, or to inhibit the sodium channel current of a hippocampal neuronal cell, or to protect a neuronal cell against NMDA-induced injury. It may also promote the formation of a pluripotent neural stem cell from a type II astrocyte, or treats a subject, such as a human, having epilepsy, Alzheimer's disease, or Parkinson's disease.

Peptide-immuno-oncology agent complexes (peptide-I/O complexes) that can home, target, migrate to, are directed to, are retained by, accumulate in, penetrate, or bind to the tumor microenvironment, tumor tissues, or cells or compartments or cytosol of cells thereof, or any combination thereof, are disclosed. Additionally disclosed are peptide-I/O complexes that can cross the blood-brain barrier. Pharmaceutical compositions and uses for peptide-I/O complexes comprising such peptides are also disclosed. Such compositions can be formulated for targeted delivery of an immuno-oncology agent (I/O) to the tumor microenvironment. Targeted compositions of the disclosure can deliver peptide-I/O complexes to target regions, tissues, structures or cells targeted by the peptide.

Disclosed herein are compositions comprising a polypeptide with at least two domains, wherein the first domain is capable of binding CD3 and the second domain is capable of binding to a cancer cell. Also disclosed herein are methods of treating cancer in a subject, comprising: providing a composition comprising a polypeptide with at least two domains, wherein the first domain is capable of binding CD3 and the second domain is capable of binding to a cancer cell; and treating the cancer by administering a therapeutically effective dosage of the composition to the subject.

The present disclosure provides compositions and methods for renal therapy. In various aspects, the present disclosure provides a composition comprising a knotted peptide, wherein upon administration to a subject the knotted peptide homes, targets, is directed to, accumulates in, migrates to, is retained by, and/or binds to renal tissue of the subject. In various aspects, the composition further comprises an active agent coupled to the knotted peptide. The composition, when administered to the subject, may induce protective preconditioning or acquired cytoresistance.

Disclosed are compositions and methods for expressing and purifying a peptide of interest using a Flagellar Type III secretion system. Disclosed are nucleic acid sequences that contain a FlgM nucleic acid sequence, a cleavage site, and a nucleic acid sequence of interest. Also disclosed are polypeptides that contain FlgM, a cleavage site and a peptide of interest. Methods of producing polypeptides that have FlgM, a cleavage site and a peptide of interest are provided.