Journal Article

Scavenger receptor B1 facilitates the endocytosis of Escherichia coli via TLR4 signaling in mammary gland infection

Saleem, Sahar, Muhee, Amatul, Shah, Riaz A., Malik, Abrar A., Ahmad, Syed Mudasir, Zargar, Mahrukh Hameed, Bhat, Basharat, Ganai, Nazir A., Taban, Qamar, Kashoo, Zahid Amin, Haq, Ehtishamul, Mumtaz, Peerzada Tajamul, Shabir, Nadeem, Magray, Suhail

2023

Overview

SCARB1 belongs to class B of Scavenger receptors (SRs) that are known to be involved in binding and endocytosis of various pathogens. SRs have emerging role in regulating innate immunity and host–pathogen interactions by acting in co-ordination with Toll-like receptors.Query Little is known about the function of SCARB1 in milk-derived mammary epithelial cells (MECs). This study reports the role of SCARB1 in infection and its potential association in TLR4 signaling on bacterial challenge in Goat mammary epithelial cells (GMECs). The novelty in the establishment of MEC culture lies in the method that aims to enhance the viability of the cells with intact characteristics upto a higher passage number. We represent MEC culture to be used as a potential infection model for deeper understanding of animal physiology especially around the mammary gland. On E.coli challenge the expression of SCARB1 was significant in induced GMECs at 6 h. Endoribonuclease-esiRNA based silencing of SCARB1 affects the expression of TLR4 and its pathways i.e. MyD88 and TRIF pathways on infection. Knockdown also affected the endocytosis of E.coli in GMECs demonstrating that  E.coli  uses SCARB1 function to gain entry in cells. Furthermore, we predict 3 unique protein structures of uncharacterized SCARB1 ( Capra hircus) protein. Overall, we highlight SCARB1 as a main participant in host defence and its function in antibacterial advances to check mammary gland infections. 77BMn9mgrsGEVLyNf1hg2w Video Abstract

• Publisher: BioMed Central,BMC
• Subject: Animals / Biomedical and Life Sciences / Cell Biology / Cytokines and Growth Factors / Endocytosis / Epithelial Cells - metabolism / Epithelial Cells - microbiology / Escherichia coli / Escherichia coli Infections - veterinary / Goat mammary gland / Goats / Infection / Life Sciences / Mammary Glands, Animal - microbiology / Protein-Ligand Interactions / Receptors / Receptors, Scavenger - metabolism / Scavenger receptor B1 / Signal Transduction / TLR4 / Toll-Like Receptor 4 - metabolism