recombinant mouse leptin  (Novoprotein)

Journal: bioRxiv

Article Title: A uniquely leptin sensitive hypothalamic neuron population limits hyperphagia and weight gain in diet-induced obesity

doi: 10.64898/2026.03.26.714161

Figure Lengend Snippet: a, Schematic of the combined Xenium spatial transcriptomics and pSTAT3 immunofluorescence workflow used to quantify leptin signaling across hypothalamic cell types in chow-fed and diet-induced obese (DIO) mice. b , UMAP embedding of neurons (17 populations; n=6 mice total) across all spatially profiled sections, colored by transcriptionally defined Lepr cell clusters. c , Marker gene expression across Lepr neuron subtypes, highlighting canonical cell type markers. d , UMAP embedding showing pSTAT3-positive Lepr neurons (green). e, Numbers of pSTAT3-positive cells across Lepr neuron subtypes in chow-fed and HFD-fed mice (n=3 mice per group; 2–3 sections per mouse). DIO increased pSTAT3 positivity nearly 10-fold overall (4.45±0.65% vs. 0.47±0.2%, P <0.001; generalized linear mixed-effects model with binomial distribution, animal as random effect). This was driven predominantly by Lepr/Glp1r neurons, which showed a >20-fold increase (21.1±1.1% vs. 0.33±0.2%, P <1×10⁻¹⁰) and accounted for >60% of all pSTAT3-positive Lepr neurons in DIO. P -values adjusted by Benjamini-Hochberg. f , Representative distribution of the each population of Lepr neurons across a single coronal section, color-coded as in b, c. Right panels show representative Xenium and immunofluorescence images showing spatial colocalization of Lepr, Glp1r, Trh , and pSTAT3 in the boxed areas of the larger panel. g , DIO-induced transcriptional changes in Lepr/Glp1r neurons, including increased expression of canonical leptin target genes ( Socs3, Nlrc5, Sbno2, Atf3; red) and immediate-early genes (e.g., Junb, Vgf ), indicating robust and sustained leptin signaling.

Article Snippet: Mouse recombinant leptin (R&D Systems, #498-OB) was reconstituted to 1 mg/ml in 20 mM Tris-HCl pH 8.0 (Invitrogen, #10434742).

Techniques: Spatial Transcriptomics, Immunofluorescence, Marker, Gene Expression, Expressing

Journal: bioRxiv

Article Title: A uniquely leptin sensitive hypothalamic neuron population limits hyperphagia and weight gain in diet-induced obesity

doi: 10.64898/2026.03.26.714161

Figure Lengend Snippet: a , Experimental design for snRNA-seq profiling of hypothalamic neurons across metabolic states: chow-fed (Chow; n=7), overnight-fasted (Fasting; n=3), fasted and refed (90 min) (Refeed; n=4), and DIO mice (HFD; n=8). b , UMAP embedding of MBH neurons (>40,000 nuclei; mean 12,401 transcripts per nucleus), with Lepr -expressing neurons labelled by subtype. c , Effects of nutritional manipulations on the total transcriptome of each neuronal population. Expression distance estimate in response to fasting (x-axis) and DIO (y-axis). Data for Lepr neurons is highlighted in cell-type specific colors. Solid diagonal line indicates matched effects between perturbations. d , Leptin gene signature (LGS) expression in for each nutritional manipulations across the indicated subsets of Lepr neurons; HFD (red), refeed (light green), chow (yellow), fasting (dark green)). e , Hierarchical clustering and grouping of differentially expressed genes identified in Lepr/Glp1r neurons. Neuronal activity genes and GABA receptor subunits highlighted.

Article Snippet: Mouse recombinant leptin (R&D Systems, #498-OB) was reconstituted to 1 mg/ml in 20 mM Tris-HCl pH 8.0 (Invitrogen, #10434742).

Techniques: Expressing, Activity Assay

Journal: bioRxiv

Article Title: A uniquely leptin sensitive hypothalamic neuron population limits hyperphagia and weight gain in diet-induced obesity

doi: 10.64898/2026.03.26.714161

Figure Lengend Snippet: a,b , UMAP embedding of mediobasal hypothalamic neurons colored by individual mouse (a) and sequencing batch (b). c , Distribution of UMI counts (top) and genes detected (bottom) per cell across all samples (chow n=7, DIO n=8, fasted n=3, refed n=4). d , UMAP colored by predicted Campbell neuron subtype. e , Mapping confidence scores, with highest confidence in the Lepr/Glp1r population. f , Proportion of cells assigned to each neuronal cluster (n01-n34) across individual samples, showing consistent cluster composition across mice and conditions. g , MINT sPLS-DA projection of three independent leptin treatment transcriptomic datasets used to derive the leptin gene signature (LGS). Fasted/control (blue) and leptin-treated (orange) samples separate along the first two components. h , Gene ontology enrichment of LGS genes, highlighting response to peptide hormone and JAK-STAT signaling among the top terms. i , Model weights for individual LGS genes. j , LGS expression across nutritional states in Tbx19 and Irx3 neurons (***P<0.001). k , Correlation between fasting-induced (y-axis) and DIO-induced (x-axis) log₂ fold changes in AgRP, Lepr/Glp1r, and POMC neurons.

Article Snippet: Mouse recombinant leptin (R&D Systems, #498-OB) was reconstituted to 1 mg/ml in 20 mM Tris-HCl pH 8.0 (Invitrogen, #10434742).

Techniques: Sequencing, Control, Expressing

Journal: bioRxiv

Article Title: A uniquely leptin sensitive hypothalamic neuron population limits hyperphagia and weight gain in diet-induced obesity

doi: 10.64898/2026.03.26.714161

Figure Lengend Snippet: a , Experimental design of wild-type (WT) mice treated with 3 mg/kg of leptin of saline and sacrificed 1, 3, 6, or 24 hours after injection. MBH nuclei were collected for snRNA-seq. b, Transcriptional distance between cells from leptin treated and control mice. c, LGS changes across Lepr/Glp1r , Pomc and Agrp neurons . d, Overlap between genes induced by acute leptin treatment and those upregulated in DIO in Lepr/Glp1r neurons (93 shared genes; odds ratio=185.3, P =6.28×10⁻²⁴, Fisher’s exact test), indicating that direct leptin action recapitulates a substantial portion of the DIO transcriptional program.

Article Snippet: Mouse recombinant leptin (R&D Systems, #498-OB) was reconstituted to 1 mg/ml in 20 mM Tris-HCl pH 8.0 (Invitrogen, #10434742).

Techniques: Saline, Injection, Control

Journal: bioRxiv

Article Title: A uniquely leptin sensitive hypothalamic neuron population limits hyperphagia and weight gain in diet-induced obesity

doi: 10.64898/2026.03.26.714161

Figure Lengend Snippet: a-c , UMAP embedding of mediobasal hypothalamic neurons from lean mice treated with leptin (3 mg/kg) or saline and harvested at 1, 3, 6, or 24 hours post-injection (n=4-6 per timepoint per group), colored by treatment (a), hours post-injection (b), and sequencing batch (c). d , UMAP colored by neuronal cell type identity, with key Lepr-expressing populations labeled. e , Number of differentially expressed genes (leptin vs saline; adjusted P<0.05) per neuronal population. Red, upregulated; blue, downregulated. f , Volcano plot of leptin-induced differential expression in Lepr/Glp1r neurons. Highlighted genes include canonical leptin targets (blue), immediate early/neuronal activity genes (red), and GABA receptor subunits (green). Dashed line, adjusted P =0.05.

Article Snippet: Mouse recombinant leptin (R&D Systems, #498-OB) was reconstituted to 1 mg/ml in 20 mM Tris-HCl pH 8.0 (Invitrogen, #10434742).

Techniques: Saline, Injection, Sequencing, Expressing, Labeling, Quantitative Proteomics, Activity Assay

Journal: bioRxiv

Article Title: A uniquely leptin sensitive hypothalamic neuron population limits hyperphagia and weight gain in diet-induced obesity

doi: 10.64898/2026.03.26.714161

Figure Lengend Snippet: a , Lepr/Glp1r neurons constitute ∼78% of all Lepr-expressing GABAergic (Gad1+) input to AgRP (Npy+) neurons, based on reanalysis of published rabies-traced AgRP neuron afferents. Feature plots show expression of Gad1, Glp1r, Npy, and Lepr across traced populations; circled clusters indicate the Lepr/Glp1r population. b,c , UMAP embedding of mediobasal hypothalamic neurons from Glp1r Lepr KO and control mice (35,538 nuclei total), colored by genotype (b) and diet (c) (chow vs DIO; n=6-7 per group). d , UMAP colored by predicted cell type identity (41 clusters) based on label transfer from the nutritional perturbation reference atlas. e , Change in leptin gene signature (LGS) expression in Glp1r Lepr KO relative to control mice across Lepr neuron subtypes (open circles denote P <0.05; linear mixed-effects model).

Article Snippet: Mouse recombinant leptin (R&D Systems, #498-OB) was reconstituted to 1 mg/ml in 20 mM Tris-HCl pH 8.0 (Invitrogen, #10434742).

Techniques: Expressing, Control

Journal: bioRxiv

Article Title: A uniquely leptin sensitive hypothalamic neuron population limits hyperphagia and weight gain in diet-induced obesity

doi: 10.64898/2026.03.26.714161

Figure Lengend Snippet: a , Schematic of retrograde rabies tracing from ARC Npy neurons in Lepr Cre-sun1Gfp ;Npy Flp mice. Starter cells (ARC) express TVA and rabies-G via Npy Flp ; rabies-labeled cells are magenta, Lepr -expressing cells green, and co-labeled cells ( Lepr -expressing afferents) show both signals. b, c, Representative images of tissue sections from experiments as in (a). *Indicates viral hit site. Afferent DMH Lepr cells indicated by white arrows. d , Schematic of retrograde rabies tracing from Agrp neurons in Agrp Cre; Glp1r Flp-TDT mice. Rabies-labeled cells are green, Glp1r -expressing cells red, and co-labeled cells ( Glp1r -expressing afferents) show both signals. e, f , Representative images of tissue sections from experiments as in (d); *indicates viral hit site. Rabies-labeled Glp1r afferent cells indicated with white arrows. Scale bars: 200 µm (main images), 100 µm (insets). g , h , Experimental paradigm: Lepr was ablated in Glp1r expressing neurons and animals were fed chow diet ( Agrp , n=7; Glp1r , n=6 Lepr KO and n=6 control) and either sacrificed at 4-5 weeks of age switched onto a HFD for 15 weeks ( Agrp n=2; Glp1r , n=7 Lepr KO and n=6 control) until sacrifice. Mediobasal hypothalami were collected for snRNA-seq. i, Leptin gene signature (LGS) expression in Lepr/Glp1r neurons from for lean (Chow) or DIO Lepr Glp1r KO and control (WT) mice. LGS was significantly reduced in KO neurons (β=−0.087, P <1.0×10⁻⁹; linear mixed-effects model), with a significant genotype × diet interaction ( P =2×10⁻⁹). j, PCA projection of Lepr/Glp1r neurons from DIO Lepr Glp1r KO (red) and Control (blue) mice onto the nutritional perturbation embedding. Centroids for DIO (orange) and fasted (teal) conditions shown as large circles. Lepr Glp1r KO neurons cluster with fasted wild-type neurons (PC1 permutation test, P=0.001), indicating LepR signaling is required to adopt the DIO transcriptional state. k, Volcano plot of differentially expressed genes in Lepr/Glp1r neurons (KO versus WT, DIO). Loss of Lepr abolished the DIO-associated induction of immediate early genes ( Fos , log₂FC=−2.14, adj. P =0.018; Vgf , log₂FC=−1.76, adj. P =1.3×10⁻⁴; Homer1 , log₂FC=−0.66, adj. P =0.027) and reversed the downregulation of GABA receptor subunits ( Gabra3, Gabra4, Gabra5, Gabrb1–b3 ). Dashed line, adjusted P =0.05. See Supplementary Table 7 for full results. l, PCA projection of Agrp neurons from DIO Lepr Glp1r KO (red) and Control (blue) mice; centroids for DIO (orange) and fasted (teal) conditions shown as large circles, as in ( j ). Agrp neurons shift toward the fasted transcriptional state in Lepr Glp1r KO mice (PC1 permutation test, P=0.001), indicating propagation of the transcriptional effect from Lepr/Glp1r neurons. m, Volcano plot of differentially expressed genes in Agrp neurons (KO versus WT, DIO; 128 genes). Genes colored by their response to fasting: orange, fasting-upregulated; blue, fasting-downregulated; grey, neither. Fasting-upregulated genes were enriched among genes increased in KO (OR=8.56, P =1.05×10⁻⁸, Fisher’s exact test), and fasting-downregulated genes were enriched among decreased genes (OR=22.67, P =6.76×10⁻¹⁹), confirming a fasting-like transcriptional state despite obesity.

Article Snippet: Mouse recombinant leptin (R&D Systems, #498-OB) was reconstituted to 1 mg/ml in 20 mM Tris-HCl pH 8.0 (Invitrogen, #10434742).

Techniques: Labeling, Expressing, Control

Journal: bioRxiv

Article Title: A uniquely leptin sensitive hypothalamic neuron population limits hyperphagia and weight gain in diet-induced obesity

doi: 10.64898/2026.03.26.714161

Figure Lengend Snippet: a , Schematic and representative histology of bilateral AAV-FLEX-FREX-hM3Dq injection into the caudal ARC/ventral DMH of Glp1r-ires-Cre;Trh-p2a-Dre mice. Scale bar: 200 µm. b , Spatial transcriptomics reference map showing the Lepr/Glp1r neuron population (red) targeted by the intersectional DREADD strategy. c , Summary of the DREADD cohort (main text ). d , Baseline characteristics of chow-fed Glp1r Lepr KO (n=20) and control (n=14) mice used for leptin-dependent feeding suppression experiments (main text ). e , Baseline chow-period body weight and DEXA body composition of Glp1r Lepr KO (n=9) and control (n=10) mice prior to HFD exposure . Data are mean ± SD.

Article Snippet: Mouse recombinant leptin (R&D Systems, #498-OB) was reconstituted to 1 mg/ml in 20 mM Tris-HCl pH 8.0 (Invitrogen, #10434742).

Techniques: Injection, Spatial Transcriptomics, Control

Journal: bioRxiv

Article Title: A uniquely leptin sensitive hypothalamic neuron population limits hyperphagia and weight gain in diet-induced obesity

doi: 10.64898/2026.03.26.714161

Figure Lengend Snippet: Mice containing activating DREADDs in Glp1r/Trh neurons were treated with saline or CNO at the onset of the dark cycle (a), during refeeding following an overnight fast (b), or prior to ghrelin treatment (c). a , Cumulative dark-cycle food intake at 0, 1, 2, and 3 hours following IP CNO or saline in a within-subject crossover design (n=5).. b , Cumulative post-fast food intake at 0, 1, 2, 4, 6, and 8 hours following IP CNO or saline (n=5). c , Cumulative food intake following IP ghrelin with CNO or saline pre-treatment at 0, 1, 2, 4, 6, and 8 hours (n=4). d, Effect of leptin (dark teal) versus saline (light teal) pre-treatment on ghrelin-induced 24-hour food intake in lean Lepr Glp1r KO (KO) and control (WT) mice. Lines connect within-subject measurements (crossover design). e, Cumulative post-fast food intake following leptin (dark teal) or saline (light teal) administration in WT (left) and KO (right) mice. f, g , Body weight (f) and daily food intake (g) before and 7 days after HFD exposure in Lepr Glp1r KO (n=9) and Control (n=10) mice. h , Food intake from (g) separated by dark (top) and light (bottom) cycle. The excess intake in Lepr Glp1r KO mice was concentrated in the dark cycle (genotype × time: χ²(9)=38.33, P =1.52×10⁻⁵). Dashed line indicates HFD switch. All panels: * P <0.05, **P<0.01, ***P<0.001. A-c, e-h: Plotted points represent mean values. Error bars (a-c) and shaded regions (e-h) denote SEM.

Article Snippet: Mouse recombinant leptin (R&D Systems, #498-OB) was reconstituted to 1 mg/ml in 20 mM Tris-HCl pH 8.0 (Invitrogen, #10434742).

Techniques: Saline, Control

Journal: bioRxiv

Article Title: A uniquely leptin sensitive hypothalamic neuron population limits hyperphagia and weight gain in diet-induced obesity

doi: 10.64898/2026.03.26.714161

Figure Lengend Snippet: a,b, Baseline characteristics of Glp1r Lepr KO and control mice used in the chow vs DIO fasting-refeeding experiment (main text ). Chow-fed and DIO cohorts are independent groups of animals. c-e, Baseline characteristics of DIO Glp1r Lepr KO (n=12) and control (n=11) mice used in the ghrelin feeding experiment. c , Summary table including plasma leptin for a subset of mice (KO n=4, WT n=3). d , Individual body weights and ( e ) plasma leptin by genotype, confirming hyperleptinemia in both genotypes. Data are mean ± SD (tables) or mean ± SEM (dot plots) with individual animals shown.

Article Snippet: Mouse recombinant leptin (R&D Systems, #498-OB) was reconstituted to 1 mg/ml in 20 mM Tris-HCl pH 8.0 (Invitrogen, #10434742).

Techniques: Control, Clinical Proteomics

Journal: bioRxiv

Article Title: Epigenetic Silencing of Carotid Body TRPM7 Attenuates Hypertension in Obese Mice

doi: 10.64898/2026.03.05.709322

Figure Lengend Snippet: (A ) (i) Representative integrated CSN activity trace in a CB preparation from an MO-CTL-treated mouse; showing the sequential effects of leptin and a TRPM7 blocker FTY720 during normoxia and hypoxia. Raw tracings throughout the time course (X-axis) are shown at the top; the scale bars represent 2 min. (ii) Summary data showing leptin induced significant increase in basal CSN activity (P = 0.004), which was abolished by Trpm7 receptor inhibitor FTY 720 (P = 0.005; N=5). (iii) Summary data showing CB chemosensitivity Hx (hypoxia) – Nx (normoxia), which was markedly enhanced by leptin (P = 0.002) and reversed by FTY 720 (P = 0.002; N=5). ( B) . (iv) Representative integrated CSN activity in a preparation from an MO-R1 treated mouse showing the sequential effects of leptin and a TRPM7 blocker FTY720 during normoxia and hypoxia. Raw tracings throughout the time course (X-axis) are shown at the top; the scale bars represent 2 min. (v) Summary data of CSN activity under normoxia, which did not significantly increase by leptin (P = 0.065; N=5) and was unaffected by FTY 720 (P = 0.065; N = 5). (iv) Summary data showing CB chemosensitivity responses (Hx − Nx) remained unchanged across treatments (P = 0.451; N= 5). Values are expressed as box and whisker plots (median, 25-75% centiles and minimum and maximum values; mean ± S.D.). Data were statistically compared by one-way repeated measures ANOVA with Holm-Sidak post-hoc comparisons. P< 0.05 was considered significant.

Article Snippet: Leptin (Cat. #498-OB; R&D Systems, Minneapolis, MN, USA), FTY720 (Cat. #SML0700; Sigma-Aldrich, St. Louis, MO, USA), and isoflurane (Item #502017; MWI Animal Health, AmerisourceBergen; Boise, ID, USA) were used in all experimental protocols.

Techniques: Activity Assay, Whisker Assay

Journal: Journal of Cachexia, Sarcopenia and Muscle

Article Title: Leptin From Fibro‐Adipogenic Progenitor Cells (FAPs) Regulates Masseter Muscle Disuse Atrophy and Ectopic Fat Accumulation

doi: 10.1002/jcsm.70141

Figure Lengend Snippet: Leptin deficiency as a potential cause of ectopic fat accumulation and muscle atrophy in the masseter muscle. (a) LEPR and leptin bands and quantitative analysis in whole muscle extracts from masseter muscles on the extraction side of mice. GADPH was used as a loading control (one‐way ANOVA; n = 3). (b) Experimental flow chart. (c) Representative images of Oil Red O staining of the mouse masseter muscle and triglyceride (TG) content of mouse masseter muscle (scale bar, 100 μm; one‐way ANOVA; n = 3). (d) LEPR, MuRF‐1 and MAFbx bands and quantitative analysis in whole muscle extracts of mouse masseter muscle (GADPH was used as a loading control) and images of immunohistochemical staining (MuRF‐1 and MAFbx) of the masseter muscle on the extracted side of mice and quantitative analysis of the positive area (brown colour) (scale bar, 100 μm; one‐way ANOVA; n = 3). (e) H&E staining images of masseter muscle on the extraction side of mice and quantitative analysis of the mean cross‐sectional area of muscle fibres (scale bar, 100 μm; one‐way ANOVA; n = 3). (f) Mouse body weight, mean food intake, fasting blood glucose, serum insulin, serum TG and serum free fatty acids (one‐way ANOVA; n = 3). *p < 0.05, **p < 0.01, ***p < 0.001; error line, mean ± standard value. DA: disuse atrophy Week 8; DA + Lep: DA + exogenous leptin treatment Week 8; NC: negative control.

Article Snippet: Local intramuscular injection of recombinant mouse leptin (1 μg/side/each, Novoprotein) or saline control was applied once daily for 4 weeks starting from the 4th week after unilateral molar extraction.

Techniques: Muscles, Extraction, Control, Staining, Immunohistochemical staining, Negative Control

Journal: Journal of Cachexia, Sarcopenia and Muscle

Article Title: Leptin From Fibro‐Adipogenic Progenitor Cells (FAPs) Regulates Masseter Muscle Disuse Atrophy and Ectopic Fat Accumulation

doi: 10.1002/jcsm.70141

Figure Lengend Snippet: RNA‐seq reveals leptin restores downregulation of the PPARα/PPAR signalling pathway in the wasted atrophic masseter muscle. (a) Bubble plots of KEGG enrichment analysis in normal masseter muscle and atrophied masseter muscle. The significance thresholds of the pathways in the graphs all satisfy p < 0.05. (b) GSEA image of the PPARα signalling pathway. (c) Clustering heatmap of differentially expressed genes in lipid metabolism and cytokine‐related pathways in normal masseter muscle and atrophic bite muscle (data are normalized values). (d) qRT‐PCR analysis of PPARα (one‐way ANOVA; n = 3). (e) PPARα bands in whole muscle extracts of mouse masseter muscle (Lamin B1 was used as a loading control) and quantitative analysis (one‐way ANOVA; n = 3). *p < 0.05, **p < 0.01, ***p < 0.001; error line, mean ± standard deviation. DA: disuse atrophy Week 8; DA + Lep: DA + exogenous leptin treatment Week 8; NC: negative control.

Article Snippet: Local intramuscular injection of recombinant mouse leptin (1 μg/side/each, Novoprotein) or saline control was applied once daily for 4 weeks starting from the 4th week after unilateral molar extraction.

Techniques: RNA Sequencing, Quantitative RT-PCR, Control, Standard Deviation, Negative Control

Journal: Journal of Cachexia, Sarcopenia and Muscle

Article Title: Leptin From Fibro‐Adipogenic Progenitor Cells (FAPs) Regulates Masseter Muscle Disuse Atrophy and Ectopic Fat Accumulation

doi: 10.1002/jcsm.70141

Figure Lengend Snippet: Leptin enhances mitochondrial FA β‐oxidation in C2C12 myotubes by directly activating PPARα, consequently attenuating intracellular lipid accumulation. (a) Oil Red stained images of C2C12 myotubes and triglyceride content (scale bar, 50 μm; one‐way ANOVA; n = 3). (b) MuRF‐1 and MAFbx bands and quantitative analysis (one‐way ANOVA; n = 3). (c) PPARα bands and quantitative analysis (one‐way ANOVA; n = 3). (d) Oil Red stained images of C2C12 myotubes and triglyceride content (scale bar, 50 μm; one‐way ANOVA; n = 3). (e) MuRF‐1, MAFbx and PPARα bands and quantitative analysis (one‐way ANOVA; n = 3). (f) CPT‐1a, ACOX1, CD36, FABP3 and SREBP‐1 bands and quantitative analysis (one‐way ANOVA; n = 3). * p < 0.05, ** p < 0.01, *** p < 0.001; error line, mean ± standard deviation. Lep, leptin‐treated group; NC, negative control group (cultured in normal medium); PA, palmitic acid‐treated group; PA + Lep, palmitic acid combined with leptin‐treated group; PA + Lep + siPPARα, palmitic acid, Leptin and PPARα siRNA co‐treatment group; PA + siPPARα: palmitic acid‐treated combined with PPARα siRNA transfection group.

Article Snippet: Local intramuscular injection of recombinant mouse leptin (1 μg/side/each, Novoprotein) or saline control was applied once daily for 4 weeks starting from the 4th week after unilateral molar extraction.

Techniques: Staining, Standard Deviation, Negative Control, Cell Culture, Transfection

Journal: Journal of Cachexia, Sarcopenia and Muscle

Article Title: Leptin From Fibro‐Adipogenic Progenitor Cells (FAPs) Regulates Masseter Muscle Disuse Atrophy and Ectopic Fat Accumulation

doi: 10.1002/jcsm.70141

Figure Lengend Snippet: FAPs are a source of localized leptin in the masseter muscle. (a) ELISA assay of serum leptin levels in mice. No significant difference (one‐way ANOVA; n = 4). (b) Images of mouse masseter muscle immunofluorescence staining (leptin) and quantitative analysis (scale bar, 100 μm; one‐way ANOVA; n = 3). (c) Immunofluorescence staining images and quantitative analysis of leptin and FAPs in mouse masseter muscle (scale bar, 100 μm; one‐way ANOVA; n = 3). (d) Histological assessment of mouse masseter muscle sections showing leptin immunoreactivity co‐localized with FAPs. (Right: white arrows). Scale bar = 100 μm (left); scale bar = 10 μm (right). (e) FACS of FAPs. (f) qRT‐PCR and ELISA analysis of leptin (one‐way ANOVA; n = 3). *p < 0.05, **p < 0.01, ***p < 0.001; error line, mean ± standard deviation. 0, 2, 4, 6 and 8 weeks: 0, 2, 4, 6 and 8 weeks after unilateral molar extraction.

Article Snippet: Local intramuscular injection of recombinant mouse leptin (1 μg/side/each, Novoprotein) or saline control was applied once daily for 4 weeks starting from the 4th week after unilateral molar extraction.

Techniques: Enzyme-linked Immunosorbent Assay, Immunofluorescence, Staining, Quantitative RT-PCR, Standard Deviation, Extraction

Journal: Journal of Cachexia, Sarcopenia and Muscle

Article Title: Leptin From Fibro‐Adipogenic Progenitor Cells (FAPs) Regulates Masseter Muscle Disuse Atrophy and Ectopic Fat Accumulation

doi: 10.1002/jcsm.70141

Figure Lengend Snippet: Nilotinib induces apoptosis in masseter muscle FAPs. (a) Experimental flow chart. (b) Effect of continuous injection of nilotinib (25 mg/kg/d ip.) on masseter muscle FAPs apoptosis on Days 3 and 5 in disuse atrophy mice, proportion of apoptotic FAPs cells and quantification of FAPs cells (scale bar, 50 μm; one‐way ANOVA; n = 3). (c) Images of masseter muscle immunofluorescence staining and quantitative analysis of leptin and PDGFRα co‐localization (scale bar, 100 μm; one‐way ANOVA; n = 3). **p < 0.01, ***p < 0.001. DA: disuse atrophy Week 4; DA + Lep: disuse atrophy Week 4 + 5 days of nilo injection; NC: negative control; nilo: negative control +5 days of nilo injection.

Article Snippet: Local intramuscular injection of recombinant mouse leptin (1 μg/side/each, Novoprotein) or saline control was applied once daily for 4 weeks starting from the 4th week after unilateral molar extraction.

Techniques: Injection, Immunofluorescence, Staining, Negative Control

Journal: Journal of Cachexia, Sarcopenia and Muscle

Article Title: Leptin From Fibro‐Adipogenic Progenitor Cells (FAPs) Regulates Masseter Muscle Disuse Atrophy and Ectopic Fat Accumulation

doi: 10.1002/jcsm.70141

Figure Lengend Snippet: Increased ectopic fat accumulation and wasting atrophy after induction of apoptosis in FAPs cells. (a) Representative images of Oil Red O staining of the mouse masseter muscle (scale bar, 100 μm). (b) Triglyceride (TG) content of mouse masseter muscle (one‐way ANOVA; n = 3). (c) Leptin, MuRF‐1 and MAFbx bands in whole muscle extracts of mouse masseter muscle and quantitative analysis. GADPH was used as a control for up‐sampling. (d) H&E staining images of masseter muscle on the extracted side of mice and quantitative analysis of the mean cross‐sectional area of muscle fibres (scale bar, 100 μm; one‐way ANOVA; n = 3). (e) Images of immunohistochemical staining (MuRF‐1 and MAFbx) of the masseter muscle on the extracted side of mice and quantitative analysis of the positive area (brown colour) (scale bar, 100 μm; one‐way ANOVA; n = 3). *p < 0.05, **p < 0.01, ***p < 0.001; error line, mean ± standard deviation. DA: disuse atrophy Week 4; DA + Lep: disuse atrophy Week 4 + 5‐day nilo injection; NC: negative control; nilo: negative control + 5‐day nilo injection.

Article Snippet: Local intramuscular injection of recombinant mouse leptin (1 μg/side/each, Novoprotein) or saline control was applied once daily for 4 weeks starting from the 4th week after unilateral molar extraction.

Techniques: Staining, Control, Sampling, Immunohistochemical staining, Standard Deviation, Injection, Negative Control