The cardiac sarcomere is a triumph of biological evolution wherein myriad contractile and regulatory proteins assemble into a quasi-crystalline lattice to serve as the central point upon which cardiac muscle contraction occurs. This review focuses on the many signaling components and mechanisms of regulation that impact cardiac sarcomere function. We highlight the roles of the thick and thin filament, both as necessary structural and regulatory building blocks of the sarcomere as well as targets of functionally impactful modifications. Currently, a new focus emerging in the field is inter-myofilament signaling, and we discuss here the important mediators of this mechanism, including myosin-binding protein C and titin. As the understanding of sarcomere signaling advances, so do the methods with which it is studied. This is reviewed here through discussion of recent live muscle systems in which the sarcomere can be studied under intact, physiologically relevant conditions.

Delving into the therapeutical potential of Cichorium endivia root extract as a natural-based antitumor supplement.

Background/Objectives: Pulmonary fibrosis (PF) is a progressive interstitial lung disease with limited therapeutic options. Lepidium sativum (cress seeds) possess recognized antioxidant and anti-inflammatory properties, yet its potential antifibrotic activity has not been investigated. This study evaluated the phytochemical composition and antifibrotic efficacy of cress seed extract (CSE) and examined whether its effects are associated with modulation of the ncNRFR/let-7d pathway in methotrexate (Mtx)-induced PF. Methods: Comprehensive metabolite profiling was performed using GC–MS, HPLC, and UPLC–T-TOF–MS/MS. Antioxidant capacity and antiproliferative effects were assessed in vitro. Network pharmacology was used to identify CSE-related PF targets and regulatory pathways. In vivo, PF was induced in adult male Wistar rats by Mtx, followed by oral CSE administration (50–150 mg/kg). Biochemical markers of inflammation, oxidative stress, extracellular matrix deposition, EMT, and ncRNA expression (ncNRFR and let-7d) were quantified alongside histopathology and immunohistochemistry. Results: CSE contained diverse terpenes, phenolics, flavonoids, glucosinolates, and amino acid derivatives. It exhibited potent antioxidant activity and antiproliferative effects against A549 and Hep2 lung cancer cells. Network analysis identified 997 overlapping CSE–PF targets and highlighted IL6 and MMP1 as relevant miR-let-7d–associated nodes. In vivo, Mtx-induced marked fibrosis characterized by increased ncNRFR, reduced let-7d, elevated IL6, HMGB1, TGF-β, MMP1, collagen, and hydroxyproline, and reduced antioxidant enzyme activity. CSE treatment dose-dependently mitigated these alterations, improved histoarchitecture, and reduced collagen deposition. Conclusions: CSE showed antifibrotic, antioxidant, and anti-inflammatory activity in MTX-induced PF in rats and modulated the reciprocal expression patterns of ncNRFR and let-7d. These findings support CSE as a potential source of bioactive constituents for PF management and identify the putative ncNRFR–let-7d regulatory relationship as a novel pathway in fibrotic lung disease, warranting further mechanistic investigation.

Background/Objectives: Rutin (RT), a promising bioflavonoid, faces clinical limitations due to its poor solubility and bioavailability. In this study, we formulated RT-loaded phytosome nanoparticles (RT-PNPs) via thin-layer hydration and characterized their morphology, size distribution, and zeta potential. Methods: We established a mouse model of Ehrlich ascites carcinoma (EAC), randomly allocating ninety female Swiss albino mice into six groups: untreated controls, RT-treated, RT-PNP-treated, EAC, EAC + RT, and EAC + RT-PNPs. Tumor induction and treatment protocols were controlled, with the oral administration of 25 mg/kg/day of RT or RT-PNPs for 20 days. We comprehensively assessed survival, body weight, ascitic fluid/tumor volume, and cell viability and performed detailed hematological, serum biochemical, and tumor marker analyses. Multiorgan (liver and kidney) function and redox homeostasis were evaluated through enzymatic assays for SOD, CAT, GSH-Px, and GSH, as well as lipid peroxidation assessment. Proinflammatory cytokines and tumor markers (AFP, CEA, CA19-9, CA125, and CA15-3) were quantified via ELISA. Results: Gene expression profiling (TP53, Bax, and Bcl-2) and flow cytometry (p53 and Ki-67) elucidated the modulation of apoptosis. Histopathological scoring documented organ protection, while advanced multivariate (heatmap and principal component) analyses revealed distinct treatment clusterings. The RT-PNPs demonstrated potent anti-tumor, antioxidant, anti-inflammatory, and apoptosis-inducing effects, outperforming free RT in restoring physiological markers and tissue integrity. Conclusions: The current results underscore the potential of RT-PNPs as a multifaceted therapeutic approach to EAC, leveraging nanoparticle technology to optimize efficacy and systemic protection.

Background/Objectives: Grape seed oil (GSO) is a potent source of dietary phytochemicals, particularly polyphenols and flavonoids, known for their health-promoting properties. This study aims to investigate the anticancer and hepatoprotective effects of a nanoemulsion formulation of grape seed oil (GSONE), to enhance the efficacy and bioavailability of its phytochemical constituents against solid tumors. Methods: Ninety female Swiss albino mice were divided into six groups: control, alone, GSONE alone, Ehrlich solid tumor (EST), EST treated with GSO, and EST treated with GSONE. Tumor development, growth performance, serum biochemistry, antioxidant status, hepatic histopathology, apoptotic gene expression, and flow cytometry analyses were assessed following 30 days of daily oral treatment. Results: GSONE significantly reduced tumor weight and volume (52.9%) and more effectively counteracted tumor-induced body weight loss than crude GSO. Treatment with GSONE normalized serum protein levels and improved liver function markers (AST, ALT, ALP, total bilirubin) to near-control values. Tumor markers (AFP, CEA) and oxidative stress indices (MDA, 8-OHdG) were markedly decreased, while activities of hepatic antioxidants (SOD, CAT, GPx, GSH) were restored. GSONE enhanced gene expression of pro-apoptotic markers (Bax, TP53, caspase-3, caspase-9), suppressed anti-apoptotic Bcl-2, and significantly increased the proportion of p53- and cleaved caspase-3-positive tumor cells. Liver histopathology and ultrastructure demonstrated normalized morphology and reduced damage in GSONE-treated mice. Multivariate analyses confirmed GSONE’s restorative effect compared to raw GSO. Conclusions: The delivery of dietary phytochemicals via nanoemulsion significantly enhances antitumor and hepatoprotective actions in a preclinical solid tumor model. These findings support the potential of phytochemical-rich edible oils, enhanced by nanotechnology, for dietary prevention and adjunctive management of cancer.