NINJ2 deficiency inhibits preadipocyte differentiation and promotes insulin resistance through regulating insulin signaling

© 2022 The Obesity Society..

OBJECTIVE: Genetic variants in ninjurin-2 (NINJ2; nerve injury-induced protein 2) confer risk of ischemic strokes and coronary artery disease as well as endothelial activation and inflammation. However, little is known about NINJ2's in vivo functions and underlying mechanisms.

METHODS: The phenotypes of NINJ2 knockout mice were analyzed, and mechanisms of NINJ2 that regulate body weight, insulin resistance, and glucose homeostasis and lipogenesis were investigated in vivo and in vitro.

RESULTS: This study found that mice lacking NINJ2 showed impaired adipogenesis, increased insulin resistance, and abnormal glucose homeostasis, all of which are risk factors for strokes and coronary artery disease. Mechanistically, NINJ2 directly interacts with insulin receptor/insulin-like growth factor 1 receptor (INSR/IGF1R), and NINJ2 knockdown can block insulin-induced mitotic clonal expansion during preadipocyte differentiation by inhibiting protein kinase B/extracellular signal-regulated kinase (AKT/ERK) signaling and by decreasing the expression of key adipocyte transcriptional regulators CCAAT/enhancer-binding protein β (C/EBP-β), C/EBP-α, and peroxisome proliferator-activated receptor γ (PPAR-γ). Furthermore, the interaction between NINJ2 and INSR/IGF1R is needed for maintaining insulin sensitivity in adipocytes and muscle via AKT and glucose transporter type 4. Notably, adenovirus-mediated NINJ2 overexpression can ameliorate diet-induced insulin resistance in mice.

CONCLUSIONS: In conclusion, these findings reveal NINJ2 as an important new facilitator of insulin receptors, and the authors propose a unique regulatory mechanism between insulin signaling, adipogenesis, and insulin resistance.

Medienart:

E-Artikel

Erscheinungsjahr:

2023

Erschienen:

2023

Enthalten in:

Zur Gesamtaufnahme - volume:31

Enthalten in:

Obesity (Silver Spring, Md.) - 31(2023), 1 vom: 13. Jan., Seite 123-138

Sprache:

Englisch

Beteiligte Personen:

Peng, Huixin [VerfasserIn]
Yu, Yubing [VerfasserIn]
Wang, Pengyun [VerfasserIn]
Yao, Yufeng [VerfasserIn]
Wu, Xinna [VerfasserIn]
Zheng, Qian [VerfasserIn]
Wang, Jing [VerfasserIn]
Tian, Beijia [VerfasserIn]
Wang, Yifan [VerfasserIn]
Ke, Tie [VerfasserIn]
Liu, Mugen [VerfasserIn]
Tu, Xin [VerfasserIn]
Liu, Huiying [VerfasserIn]
Wang, Qing K [VerfasserIn]
Xu, Chengqi [VerfasserIn]

Links:

Volltext

Themen:

Cell Adhesion Molecules, Neuronal
EC 2.7.11.1
Glucose
IY9XDZ35W2
Insulin
Journal Article
Ninj2 protein, mouse
PPAR gamma
Proto-Oncogene Proteins c-akt
Research Support, Non-U.S. Gov't

Anmerkungen:

Date Completed 30.12.2022

Date Revised 02.01.2023

published: Print-Electronic

Citation Status MEDLINE

doi:

10.1002/oby.23580

funding:

Förderinstitution / Projekttitel:

PPN (Katalog-ID):

NLM35016536X