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Table 4 Targeting peptides

From: Functional immunopeptides: advancing prevention and therapeutic strategies against animal diseases

Type

Sequence

Target receptor

Pathogen

Outcome

Source

DC-targeting peptide

FYPSYHSTPQRP

TLR4

CD80

MHC-II

H9 N2 Avian Influenza

- Activate DCs

- Enhance adaptive immune response

- Facilitate T and B-cell activation

(Shi et al. 2016; Sun et al. 2018)

Transmissible gastroenteritis coronavirus (TGEV)

- Enhance antigen presentation

- Stimulate T and B-cell activation

(Jin et al. 2018)

Newcastle disease virus

- Increase IgA

- Stimulate T-cell activation

(Y. Jiang et al. 2015)

Macrophage-targeting peptide

SRCR 5–9

CD163

PRRSV

Inhibit PRRSV infection by blocking virus attachment to CD163 receptor

(Deng et al. 2023; H. Yang et al. 2024; Zhu et al. 2023)

4H7

8H2

Inhibit PRRSV infection by blocking virus attachment and replication postattachment to CD163 receptor

DC-targeting peptide

NiV G (ECD)

NiV F (aa 45–90)

NiV N (aa 318–355)

CD40

Nipah virus

- Induce protective immunity and cross-neutralization against different strains

- Enhance T and B-cell responses

(Pastor et al. 2024)

DC-targeting peptides

SPHLHTSSPWER

Not specified

IBDV

Enhances binding to DCs

(S. Ma et al. 2019)

DC-targeting peptides

LYPPPY (CTLA4-6 aa)

B7

PEDV

- Enhance antigen capture

- T-cell activation

(Xia et al. 2022)

Macrophage-targeting peptide

Chicken heterophil CATH2 (1–13)-TP5 (CbTP)

RFGRFLRKIRRFRRKDVY

TLR2

Immunosuppressive disease

Inhibit immunosuppression

(X. Wei et al. 2021)

DC-targeting peptide

HSLRHDYGYPGH

KCCYPN

MYPPPY

CD86

MHC-II

Rabbit hemorrhagic disease virus (RHDV)

- Enhance antigen capture

- Promote DC maturation

- Increase cytokine secretion

(Xia et al. 2024)

  1. Abbreviations: PRRSV porcine reproductive and respiratory syndrome virus, PEDV porcine epidemic diarrhea virus, IBDV infectious ursal disease virus, TLR toll-like receptor, DC dendritic cell, MHC major histocompatibility complex, IG immunoglobulin