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Superparamagnetic iron oxide nanoparticles (SPIONs) represent a versatile class of theranostics with profound applications in biomedicine. An eco-friendly modification of SPIONs was attempted with a 110 kDa galactomannan (PSP001) isolated from the fruit rind of Punica granatum. The PSP001 appended SPIONs favor unique advantages including tumor-targeted accumulation and improved biocompatibility. The antineoplastic agent methotrexate (MTX) was covalently attached with the galactomannan in the SPIONs to yield PSP-IO NPs that demonstrated a reduction-sensitive drug release kinetics favoring MTX accumulation selectively in the tumor cells. Folate receptor (FR) targeted cancer cell uptake followed by the stimuli-responsive release of the payload favored improved biocompatibility and lack of toxicity in BALB/c mice. Superior tumor reduction capacity with marked survival benefits was observed in Ehrlich ascites carcinoma (EAC) bearing solid tumor mice. Phantom imaging of the carrier (PSP-IO) and the drug-loaded (PSP-IO-MTX NPs) nano-constructs generated an r2 relaxivity of 335.3 mM

Carbohydrate–lectin interactions and glycol-molecule-driven self-assembly are powerful yet challenging strategies to create supramolecular nanostructures for biomedical applications. Herein, we develop a modular approach of micellization with a small molecular mannosylated-calix[4]arene synthetic core, CA4-Man3, to generate nano-micelles, CA4-Man3-NPs, which can target cancer cell surface receptors and facilitate the delivery of hydrophobic cargo. The oligomeric nature of the calix[4]arene enables the dynamic self-assembly of calix[4]arene (CA4), where an amphiphile, functionalized with mannose units (CA-glycoconjugates) in the upper rim and alkylated lower rim, afforded the CA4-Man3-NPs in a controllable manner. The presence of thiourea units between calixarene and tri-mannose moiety facilitated the formation of a stable core with bidentate hydrogen bonds, which in turn promoted mannose receptor targeted uptake and helped in the intracellular pH-responsive release of antineoplastic doxorubicin (Dox). Physiochemical features including the stability of the nanomicelle could circumvent the undesirable leakage of the cargoes, ensuring maximum therapeutic output with minimum off-targeted toxicity. Most importantly, surface-enhanced Raman scattering (SERS) was utilized for the first time to evaluate the critical micelle concentration during the formation, cellular uptake and intracellular drug release. The present study not only provides an architectural design of a new class of organic small molecular nanomicelles but also unveils a robust self-assembly approach that paves the way for the delivery of a wide range of hydrophobic chemotherapeutic drugs.

The recent outbreak of the COVID-19 pandemic is caused by severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2), which infects human epithelial tissue by interaction of the receptor-binding domain of its spike protein (S-protein) with angiotensin-converting enzyme 2 (ACE2). Herein, we synthesized suitably configured Troger's bases (TB-1/2/3) and investigated molecular docking of TBs at the interface of SARS-CoV-2 S-protein and ACE2, which revealed a high docking score indicating strong binding. Detailed analysis of docking highlights strong binding of TB-2 into the interfacial domain of SARS-CoV-2 S-protein and ACE2. Furthermore, for the first time, we explored surface-enhanced Raman scattering (SERS) modality to assess intermolecular interactions between TBs and SARS-CoV-2 S-protein and ACE2.

We have developed an amphiphilic pH probe (P1CS) to detect pH levels in the plasma membrane in cancer cells. An elevated fluorescence signal at 550 nm at the cell surface of cancer cells (MDA-MB-231, HeLa cells) prompted the application of P1CS as a pH marker for the cancer cell surface, discriminating it from normal cells (WI-38). Moreover, the probe enables labeling of the surface of multilayered tumor spheroids, which promotes its use as a marker for the surface of tumor tissue.

Realizing the importance of activation of the anticancer drug, its distribution, and for cancer management, a new theranostic probe has been developed. Endogenous H

A straightforward investigation with a surfactant-free green method mediated orchestration of a nanocomposite, where immunotherapy was fused with antimicrobial ability in a biogenic amalgamation, resulted in a nanoimmunobiotics (NIB). Consequently, a galactoxyloglucan (PST001) isolated from

Effective treatment of malignant melanoma requires an appropriate combination of therapeutic intervention with long-term prognosis as it often survives by monotherapies. Herein, we report a novel melanoma-targeted theranostic nanoenvelope (MTTNe: ISQ@BSA-AuNC@AuNR@DAC@DR5) which has been constructed by assembling a bovine serum albumin (BSA) stabilized gold nanocluster on a gold nanorod (BSA-AuNC@AuNR), a three-in-one theranostic modality, i.e., photothermal therapy (PTT), photodynamic therapy (PDT), and chemotherapy, tethered with a surface-enhanced Raman scattering (SERS) detection technique. The resultant MTTNe was coloaded with the melanoma-specific FDA approved drug dacarbazine (DAC) and a newly synthesized near-infrared (NIR) absorbing squaraine molecule ISQ that served partly as a photosensitizer and multiplex Raman reporter. Finally, a nanoenvelope was anchored with anti-DR5 monoclonal antibodies as a targeting motif for highly expressed melanoma-specific death receptors in malignant cells. Significant phototherapies of MTTNe were initiated upon an 808 nm single laser trigger which showed a synergistic effect of photothermal hyperthermia as well as singlet oxygen (

Pancreatic cancer represents one of the most aggressive in nature with a miserable prognosis that warrants efficient diagnostic and therapeutic interventions. Herein, a MnO

Recent advancements in a nanoarchitecture platform for safe and effective targeted phototherapy in a synergistic fashion is an absolute necessity in localized cancer therapy. Photothermal and photodynamic therapies (PTT and PDT) are considered as the most promising localized therapeutic intervention for cancer management as they have no long-term side effects and are minimally invasive and affordable. Herein, we have demonstrated a tailor-made nanotheranostic probe in which macrocyclic host cucurbituril [8] (CB[8]) is placed as a glue between two gold nanorods (GNRs) within ∼3 nm gaps in linear nanoassemblies with exquisitely sensitive plasmonics that exert combined phototherapy to investigate the therapeutic progression on human breast cancer cells. Photosensitizer methylene blue was positioned on CB[8] to impart the PDT effect, whereas GNR was responsible for PTT on a single laser trigger ensuring the synchronized phototherapy. Furthermore, the nanoconstruct was tagged with targeting anti-Her2 monoclonal antibody (MB-CB[8]@GNR-anti-Her2) for localized PTT and PDT on Her2 positive SKBR3 cells, subsequent cellular recognition by surface-enhanced Raman spectroscopy (SERS) platform, and further assessment of the combined intracellular phototherapy. Hence, the current strategy is definitely marked as a proof-of-concept straightforward approach that implies the perfect nature of the combined phototherapy to achieve an efficient cancer treatment.

The nicotinamide adenine dinucleotide-reduced (NADH) function as a hydride (H) carrier to maintain cellular homeostasis. Herein, we report a quinoline appended iridium complex (QAIC) as a molecular probe in fluorescence and surface-enhanced Raman spectroscopy (SERS) modalities to evaluate the endogenous NADH status. NADH-triggered activation of QAIC enabled luminescence (turn-ON) and SERS (turn-OFF) switching phenomenon with a detection limit of 25.6 nM and 15 pM for NADH in luminescence and SERS respectively. Transition state modelling using density functional theory calculations proved that a facile migration of H from NADH to QAIC transformed the activated QAIC (N-QAIC) with an energy span of 19.7 kcal/mol. Furthermore, N-QAIC is probed as a photosensitizer to source singlet oxygen by blocking the photo induced electron transfer (PeT) and generate NAD radicals. Therefore, an efficient light triggered cyclometalated iridium-based molecular probe has been divulged to promote bimodal NADH sensing and multiphase photodynamic therapy.

The intrinsic complexities of cell-surface glycans impede tracking the metabolic changes in cells. By coupling metabolic glycan labelling (MGL) and surface-enhanced Raman scattering (SERS), we employed the MGL-SERS strategy to elucidate the differential glycosylation pattern in cancer cell lines. Herein, for the first time, we are reporting an N-alkyl derivative of glucosamine (GlcNPhAlk) as a glycan labelling precursor. The extent of labelling was assessed by utilizing Raman imaging and verified by complementary fluorescence and Western blot analysis. MGL-SERS technique was implemented for a comparative evaluation of cell surface glycan imbalance in different cancer cells wherein a linear relationship between glycan expression and metastatic potential was established. Further, the effect of sialyltransferase inhibitor, P-3Fax-Neu5Ac, on metabolic labelling of GlcNPhAlk proved the incorporation of GlcNPhAlk to the terminal glycans through the sialic acid biosynthetic pathway. Hence, this methodology unveils the phenomenon of metastatic progression in cancer cells with inherent glycosylation-related dysplasia.

Efficient fluorophores with easy synthetic routes and fast responses are of great importance in clinical diagnostics. Herein, we report a new, rigid pentacyclic pyrylium fluorophore, PS-OMe, synthesised in a single step by a modified Vilsmeier–Haack reaction. Insights into the reaction mechanism facilitated a new reaction protocol for the efficient synthesis of PS-OMe which upon demethylation resulted in a “turn-on” pH sensor, PS-OH. This new fluorescent probe has been successfully used to monitor intracellular acidification at physiological pH. From the fluorescence image analysis, we were able to quantify the intracellular dynamic pH change during apoptosis. This new pH probe is a potential chemical tool for screening, drug discovery and dose determination in cancer therapy., A modified Vilsmeier–Haack reaction resulted in the synthesis of a pyrylium based turn-on fluorescent pH probe. The probe can monitor minute acidification and dynamic pH variation in cells during apoptosis with therapeutic chemo drugs.

Precise control over the dynamics of nanoparticles (NPs) in a tumor microenvironment is highly warranted for the development of an efficient nanotheranostic agent. Even though inductively coupled plasma mass spectrometry can provide a quantitative assessment regarding the uptake efficiency of metal NPs, enumeration of deep tissue penetration capacity remains as a challenge. Herein, we have demonstrated an accurate tracking of the uptake efficiency and penetration phenomenon of gold nanoparticles (AuNPs: 40-50 nm) with respect to three different surface charges in monolayer (2D) cells, multicellular spheroids (3D) and in vivo tumors by surface-enhanced Raman spectroscopy (SERS). While positively charged AuNPs showed around two-fold increased internalization in monolayer cells, SERS-tag-based line scanning on multi-layered tumor spheroids illustrated almost nine-fold superior penetration capability with negatively charged AuNPs. Further, the enhanced solid tumor distribution contributed by the negatively charged AuNPs could appreciably escalate its clinical utility in cancer management.

An unexploited homo-polysaccharide (PSM001) isolated from the seed kernel of Kottukonam variety of Mangifera indica, demonstrated selective cytotoxicity against cancer cells both in vitro and in murine models while maintaining the immunostimulatory potential. Galactoxyloglucan (PST001) isolated from the seeds of Tamarindus indica, was previously established to be an effective anticancer and immunomodulatory agent. Cancer metastasis, with key features including invasion, migration, increased angiogenesis and colony formation is only likely to accentuate in the coming decades, considering the ground realities of the modern lifestyle and environmental factors and hence both the polysaccharides were tested towards the management of malignancy. It was a startling observation with both the biopolymers in inhibiting various processes involved in the metastatic cascade. A quick perusal of the issue at hand would throw up the promising ability of both PSM001 and PST001 to inhibit lung metastatic nodules of C57BL/6 mice wherein the combinatorial treatment of these polysaccharides with vincristine delivered superior therapeutic output. Later, vascular endothelial growth factor and multiple matrix metalloproteinases were found to be the lead players in the polysaccharide mediated metastatic inhibition. Having considered the complexities associated with the chemotherapy in metastatic cancer in terms of palpable immunosuppression, the aftermaths with the co-administration of an immunostimulatory agent which itself possess unique anticancer and anti-metastatic potentials with a potent chemotherapeutic agent will be enormously consequential.

The design and development of an efficacious tumor-specific drug-delivery system is a challenging task. In this study, we have synthesized target-specific small peptide substrates on an octaguanidine sorbitol scaffold, named small molecular targeted drug-delivery conjugate (SMTDDC). The SMTDDC fabrication, with dual targeting cRGD and Cathepsin B (Cath B)-specific tripeptide (Glu-Lys-Phe), altered the microtubule network of glioblastoma cells by the orchestrated release of the cytotoxic paclitaxel (PTX). Cath B assisted PTX delivery was monitored by high-performance liquid chromatography and Surface-Enhanced Raman Scattering (SERS) modalities. The time-dependent SERS fingerprinting and imaging revealed a fast and accurate PTX release profile and subsequent in vitro cytotoxicity as well as the apoptotic events and microtubule network alteration in U-87 MG glioblastoma cells. Furthermore, SMTDDC displayed adequate stability under physiological conditions and demonstrated biocompatibility toward red blood cells and lymphocytes. This study indicated a new insight on SERS-guided peptidomimetic sorbitol molecular transporter, enabling a greater promise with high potential for the further development of PTX delivery in glioblastoma treatment.

Dental implants are a universally employed common treatment approach for the loss of teeth. Dental implants play a vital role in the field of dentistry for overcoming various dental problems including tooth loss, crown damage, and diastema. Three-dimensional (3D) bio-printing is an emerging technology with unparalleled potential in which polymers or materials are joined or polymerized with the aid of computer-assisted designing for the development of various constructs. It enables precise control over multiple compositions, architectural accuracy, and spatial distributions for accomplishing effective recapitulation of mechanical properties, microstructure, and biological functions of target tissues and organs. Along with many unique biomedical applications, 3D printing has a great impact in dentistry for restoration and implant applications. The use of computer-aided designing and selection of polymeric material with desired features for manufacturing, printing, and implantation can be applied for curing dental deformations with greater speed and lesser effort. In this context, this chapter mainly provides an overview about recent advances in 3D bioprinting for engineering dental implants with greater biocompatibility and suitability.

In an attempt to circumvent the major pitfalls associated with conventional chemotherapy including drug resistance and off-target toxicity, we have adopted a strategy to simultaneously target both mitochondrial DNA (Mt-DNA) and nuclear DNA (n-DNA) with the aid of a targeted theranostic nanodelivery vehicle (TTNDV). Herein, folic acid-anchored p-sulfo-calix[4]arene (SC4)-capped hollow gold nanoparticles (HGNPs) were meticulously loaded with antineoplastic doxorubicin (Dox) and its mitochondrion-targeted analogue, Mt-Dox, in a pretuned ratio (1:100) for sustained thermoresponsive release of cargo. This therapeutic strategy was enabled to eradicate both n-DNA and Mt-DNA leaving no space to develop drug resistance. The SC4-capped HGNPs (HGNPSC4) were experimented for the first time as a photothermal (PTT) agent with 61.6% photothermal conversion efficiency, and they generated tunable localized heat more efficiently than bare HGNPs. Moreover, the cavity of SC4 facilitated the formation of an inclusion complex with folic acid to target the folate receptor expressing cancer cells and imparted enhanced biocompatibility. The as-synthesized TTNDV was demonstrated to be an ideal substrate for surface-enhanced Raman scattering (SERS) to monitor the molecular-level therapeutic progression in cells and a spheroidal model. A significant reduction in the tumor mass with a marked survival benefit was achieved in syngraft murine models through this synergistic photo-chemotherapy. Collectively, this multifunctional nanoplatform offers a robust approach to treat cancer without any scope of generating Dox resistance and off-target toxicity.

Reactive carbonyl species (RCSs) including one carbon formaldehyde (FA) and dicarbonyl compounds such as methylglyoxal (MGO) and glyoxal (GO) are produced during demethylase reactions and various glucose metabolic pathways respectively. Elevation of the RCSs concentrations in cells is due to abnormal DNA damage, glycation adducts with macromolecules that lead to various neurotoxic diseases. Hence, regular monitoring of these RCSs with an easy tool is of utmost interest. However, conventional methods such as chromatography and mass spectrometry for the detection of these species are not so economically viable. These issues were well addressed by the non-invasive reactivity-based fluorescence techniques. However, tedious synthesis, only specific to either mono aldehyde is limited to detect multiple RCSs in physiologies by synthesized fluorophores. An alternative, simple small molecules are widely applied as commercial biomarkers such as terephthalate and 2,3-diaminonaphthalene (NAP) for hydroxy radical (OH·) and nitric oxide (NO) respectively. Herein, we report an analogue of NAP, 1,8-diamino naphthalene (DAN) is an efficient chemosensor for highly sensitive detection of FA, MGO and GO with minimum detection limits of 0.95–3.97 μM. Surprisingly, DAN shows a “turn on” response towards RCSs but remaining silent towards NO which are exactly opposite to commercial probe NAP. Exogenous RCSs imaging in vitro cancerous cells shows the efficacy of the probe and its potential application for RCSs monitoring in cancer cells, generation of toxic byproducts.

Iron oxide nanoparticles (IONPs) are employed as MRI contrast agents and as effective drug delivery vehicles. However, the limited solubility and biodegradability of these nanoparticles need to be improved for safer biomedical applications. In an attempt to improve the bottlenecks associated with IONPs, the current study focuses on the synthesis of folic acid conjugated, galactoxyloglucan-iron oxide nanoparticles (FAPIONPs), for the loading and controlled release of the encapsulated chemotherapeutic agent doxorubicin (DOX). The as-designed DOX@FAPIONPs induced a dose-dependent increase in cytotoxicity in folate receptor-positive cells through a caspase-mediated programmed cell death pathway while bare DOX demonstrated a non-targeted toxicity profile. Using LC-MS/MS analysis, several major biological processes altered in treated cells, from which, cell cycle, cellular function and maintenance were the most affected. Detailed toxicity studies in healthy mice indicated the absence of any major side effects while bare drugs created substantial organ pathology. Gadolinium-based contrast agents have a risk of adverse effects, including nephrogenic systemic fibrosis overcome by the administration of DOX@FAPIONPs in xenograft mice model. Tumor-targeted biodistribution pattern with a favorable DOX pharmacokinetics will be the driving factor behind the appealing tumor reduction capacity and increased survival benefits demonstrated on solid tumor-bearing mice.

An eco-friendly polysaccharide (PSP001) isolated from the fruit rind of Punica granatum is a biodegradable polymer with immunostimulatory and anticancer properties. PSP001 was employed for the stimuli-responsive targeted delivery of antineoplastic agent doxorubicin (Dox) by the fabrication of Dox-holding PSP nanoparticles (DPN). The galactose moieties of PSP001 were occupied as an effective tumor-targeted motif against the over-expressed asialoglycoprotein and galectin receptors of cancers. DPN followed a pH-sensitive cargo release kinetics, competent cancer cell internalization profile, and appealing biocompatibility towards peripheral red blood cells. The selective execution of caspase-mediated programmed cell death by the DPN on cancer cells was confirmed with multiple apoptosis studies. Extensive toxicity profiling on BALB/c mice rules out any palpable signs of abnormality with DPN administration while bare Dox produced vital signs of toxicity. Studies on syngraft solid tumor-bearing mice uncovered the tumor homing nature of DPN with the subsequent release of the entrapped drug which further translated in the direction of a significant reduction in the tumor payload and enhanced survival benefits, thus offering a robust approach towards endurable cancer management.

Realizing the importance of activation of the anticancer drug, its distribution, and for cancer management, a new theranostic probe has been developed. Endogenous H2S stimulated the theranostic mol...

The downsides of conventional cancer monotherapies are profound and enormously consequential, as drug-resistant cancer cells and cancer stem cells (CSC) are typically not eliminated. Here, a targeted theranostic nano vehicle (TTNV) is designed using manganese-doped mesoporous silica nanoparticle with an ideal surface area and pore volume for co-loading an optimized ratio of antineoplastic doxorubicin and a drug efflux inhibitor tariquidar. This strategically framed TTNV is chemically conjugated with folic acid and hyaluronic acid as a dual-targeting entity to promote folate receptor (FR) mediated cancer cells and CD44 mediated CSC uptake, respectively. Interestingly, surface-enhanced Raman spectroscopy is exploited to evaluate the molecular changes associated with therapeutic progression. Tumor microenvironment selective biodegradation and immunostimulatory potential of the MSN-Mn core are safeguarded with a chitosan coating which modulates the premature cargo release and accords biocompatibility. The superior antitumor response in FR-positive syngeneic and CSC-rich human xenograft murine models is associated with a tumor-targeted biodistribution, favorable pharmacokinetics, and an appealing bioelimination pattern of the TTNV with no palpable signs of toxicity. This dual drug-loaded nano vehicle offers a feasible approach for efficient cancer therapy by on demand cargo release in order to execute complete wipe-out of tumor reinitiating cancer stem cells.

Hydrogen sulfide (H2S), an essential neurotransmitter, regulates physiological processes, including brain function. Lower level of endogenously produced H2S may lead to Alzheimer’s disease (AD), which is a progressive neurodegenerative disorder characterized by the deposition and aggregation of amyloid-beta (Aβ) peptides in the brain tissue. Developing a molecular probe enabling sensing and visualizing of Aβ-disaggregates caused by H2S would be a potential therapeutic benefit for Alzheimer’s disease. Herein, we report a rational design and synthesis of an orthogonally substituted tetraphenylethylene (TPE) dual functional turn-on molecular luminophore TPE-NBD-D. The current strategy centers on a TPE-core appended with an ancillary H2S sensing unit i.e., 4-chloro-7-nitrobenzofurazan (NBD) and a disulfide linked donor (D: 4-(pyridin-2-yldisulfaneyl)-benzoate) as a source of H2S in presence of bio-thiols. The disulfide-linked H2S-donor is cleaved off from the TPE by esterase and its counterpart exhibited a turn-on fluorescence response after releasing NBD ligand in bio-thiol environments. Molecular probe TPE-NBD-D, showed a marked efficiency to detect H2S in solution state (LOD 0.1 µM) through AIE phenomenon and featured its aqueous solubility, cell membrane permeability, low cytotoxicity and high selectivity towards H2S. The probe enabled to detect intracellular H2S in neuroblastoma cell line SHSY-5Y as reflected by the turn-on fluorescence. Further, the TPE-NBD-D has been employed in vivo mice model where the probe is capable of releasing H2S in thiol abundant colorectal area and opens up a new insight to understand the involvement of H2S releasing molecules in the management of Alzheimer’s disease (AD). Eventually, the H2S production by TPE-NBD-D has been demonstrated to induce the Aβ1-42 de-agglomeration which is meticulously monitored by the AFM, SEM and Raman fingerprint analysis of the model agglomerated form of Aβ1-42 protein. This is the first time, we revealed TPE-structured molecular probe enabling as H2S donor and utilized for amyloid beta de-agglomeration without imparting any cytotoxicity. Therefore, this probe may be a potential chemical tool for the diagnosis and treatment of AD.

Comprehensive profiling of multiple protein targets plays a critical role in deeper understanding of specific disease conditions associated with high heterogeneity and complexity. Herein, we present the design and fabrication of smart programmable nanoarchitectures, which could integrate clinically relevant diagnostic modalities for the multiplexed detection of most prevalent panel of disease biomarkers present in lung cancer. The multiplex nanoprobes were prepared by attaching dual-functional Raman-active fluorogens onto spherical gold nanoparticles through a peptide linker, Phe-Lys-Cys (FKC), which is engineered with a cathepsin B (cathB) enzyme cleavage site. The presence of cathB induces the scission of FKC upon homing into the cancer cells, resulting in the release of the initially latent fluorophores with a concomitant quenching of the surface-enhanced Raman signal intensity, thereby realizing an on-off switching between the fluorescence and Raman modalities. The enzyme-triggered switchable nanoprobes were utilized for the simultaneous detection of pathologically relevant lung cancer targets by tethering with specific antibody units. The multiplex-targeted multicolor coded detection capability of the antitags was successfully developed as a valid protein screening methodology, which can address the unmet challenges in the conventional clinical scenario for the precise and early diagnosis of lung cancer.

Galactomannan isolated from the fruit rind of Punica granatum was previously reported to have excellent antioxidant, immunomodulatory and anticancer properties against both human and murine cancer cells. This polysaccharide was proved to be an anticancer agent either alone or as an adjuvant to chemotherapy. An exploration leads to the fabrication of silver nanoparticles with an average size around 30 nm and a negative surface charge of 35.2 mV using this biopolymer which acted both as reducing and capping agent and displayed good stability and biocompatibility. UV–vis spectrum of the aqueous medium containing silver nanoparticles showed an absorption peak at around 440 nm. The nanoparticles displayed an upgraded and selective cytotoxicity towards human adenocarcinoma, colorectal carcinoma and hepatocellular carcinoma cells. The induction of cancer cell toxicity was proved to be through the induction of programmed cell death pathway mediated with the active involvement of caspases. The significant anti-metastatic properties will further favour the safer in vivo application of these silver nanoparticles against neoplasia. The nontoxic nature of polysaccharide endowed the resultant silver nanoparticles with excellent biocompatibility towards red blood cells and extended the biomedical potential of this candidate. Hence, the surfactant-free green method mediated orchestration of biogenic silver nanoparticles resembled a potential theransonstic nano-construct with synergistic anticancer and immunomodulatory potential in a single platform.

A palladium-catalyzed aminocarbonylation strategy exploiting chloroform as a CO source has been developed for the synthesis of biologically potent 2-amidoimidazopyridine scaffolds. The aminocarbonylation reaction was found to be general with a range of amines and substituted imidazopyridines. Preliminary biological evaluation of cytotoxicity on selected examples provides scope for future investigations.

Galactomannan (PSP001) isolated from the fruit rind of Punica granatum was demonstrated as an excellent antioxidant, immunomodulatory and anticancer agent both in vitro and in vivo models. Since the most lethal and debilitating attribute of cancer cells is their ability to evolve to a state of malignancy, with key features like increased angiogenesis, invasion, migration, colony formation, and metastasis, the present study focused on evaluating the effects of the galactomannan on tumor and malignancy. PSP001 effectively reduced the neovascularization in chick embryos highlighting its potential as an angiogenic inhibitor. Furthermore, the invasion, migration and clonogenic capacity of human and murine cancer cells were dramatically inhibited by PSP001. Evaluation of the molecular mechanism of its unique potential revealed the down regulation of key players including VEGF, MMP-2, and MMP-9 with marked elevation of TIMP-1 and TIMP-2. The anti-metastatic potential of PSP001 tested in pulmonary metastasis C57BL/6 mice model deciphered the combinatorial administration with vincristine deliberated better survival rates and decreased metastatic index. The angiogenic inhibition potential of PSP001 was further proved with peritoneal angiogenesis assay in BALB/c mice ascitic tumor model. The outcomes of the current investigation highlight the mode of action of antitumor galactomannan in the reduction of tumor malignancy.

A biocompatible natural polysaccharide (PSP001) isolated from the fruit rind of Punica granatum was conjugated with L-cysteine (Y) to be used as a skeleton for the fabrication of fluorescent gold nanoclusters (AuNCs) represented as PSP-Y-AuNCs. With an average size of ~ 6 nm, PSP-Y-AuNCs demonstrated high quantum yield (31%), with a pH-sensitive fluorescence emission behavior. An emission maximum of 520 nm was obtained at acidic pH, which was blue shifted with increasing pH. This feature provides the possibilities for accurate ratiometric pH imaging. The PSP-Y-AuNCs not only demonstrated excellent biocompatibility with cancer cells and isolated peripheral lymphocytes and red blood cells but also demonstrated to be an active molecular imaging probe with appealing cellular uptake efficiency. The investigations with BALB/c mice further confirmed the non-toxic nature and in vivo imaging potential of the AuNCs. Estimation of the bio-distribution on solid tumor bearing syngeneic murine models revealed a tumor-targeted enhanced fluorescence emission pattern which is attributed to the pH responsive fluorescence behavior and the acidic microenvironment of the tumor. These findings were further confirmed with an impressive tumor accumulation pattern displayed in a xenograft of human cancer bearing nude mice. On account of their impressive biocompatibility and photophysical features, PSP-Y-AuNCs can exploited for the real-time fluorescence imaging of cancer tissues. Graphical abstract Fluorescent gold nanoclusters (PSP-Y-AuNCs) fabricated using a non-toxic natural polysaccharide (PSP001) demonstrated pH sensitive fluorescence emission pattern. The increased fluorescence readouts at acidic conditions and excellent biocompatibility made the PSP-Y-AuNCs an appealing candidate for in vivo tumor imaging applications.

Hydnocarpin (Hy) is a flavonoid isolated and purified from the seeds of

The extensive advancement with novel wound dressing materials functionalized with desirable properties, often touted as a panacea for cuts and burns afflicting various pathologies. However, it would indeed be a hard task to isolate any such material which perfectly fits the needs of any biomedical issue at hand. Biocompatibility, biodegradability as well as non-toxicity of natural polysaccharide served as a versatile and tunable platform for designing natural polysaccharide based scaffolds as an attractive tool in tissue engineering with a greater degree of acceptability. In this regard, we aimed to fabricate a semi interpenetrating hydrogel via exploiting the nontoxic and immune-stimulatory nature of galacto-xyloglucan (PST001) which was further doped with silver nanoparticles to formulate SNP@PST. The wound healing potential of SNP@PST was then studied both with in vitro and preclinical mice models. The current study gives a formulation for cost effective preparation of polysaccharide hydrogels using acrylamide crosslinking with improved biocompatibility and degradability. Wound healing studies in mice proved the efficiency of gels for the clinical application wherein the incorporation of nanosilver greatly enhanced the antimicrobial activity.

Galactoxyloglucan (PST001), isolated from seed kernel of Tamarindus indica is a non-toxic immunostimlatory agent with selective cytotoxicity on cancer cells. Toxicity associated with the chemotherapeutic drug doxorubicin (Dox) is the major barrier in its clinical application. Stable, spherically shaped PST-Dox nanoparticles with an average size of 10 nm were prepared via ionic gelation of Dox with PST001 which displayed a pH dependent cumulative Dox release kinetics. PST-Dox nanoparticles demonstrated cancer-specific enhanced cytotoxic effects than PST001 and Dox in cancer cells by enhanced cellular uptake of Dox through the induction of apoptosis, sparing normal cells and RBCs. Elucidation of molecular mechanism by whole genome microarray revealed down-regulation of tyrosine kinase oncogenic pathways as PST-Dox mode of action. An in silico model of PST-Dox was developed and computed the activity against topoisomerase IIy, human Abl kinase and protein tyrosine kinases. Computational studies further affirmed the findings of genomic and proteomic investigations with an increased interaction energy between PST-Dox complexes with target system than with Dox and PST001 alone. The important findings and profoundly restrained methodologies highlighted in the current study will accelerate the therapeutic potential of this nanoparticle formulation for substantial clinical studies and testing in several cancers. To conclude, PST-Dox nanoparticles represent a superior drug delivery nanosystem for the effective treatment of cancer even though detailed investigations are warranted.

We have designed and synthesized novel tetraphenylethylene (TPE) appended organic fluorogens and unfold their unique Raman fingerprinting reflected by surface-enhanced Raman scattering (SERS) upon adsorption on nanoroughened gold surface as a new insight in addition to their prevalent aggregation-induced emission (AIE) and aggregation-caused quenching (ACQ) phenomena. A series of five TPE analogues has been synthesized consisting of different electron donors such as (1) indoline with propyl (TPE-In), (2) indoline with lipoic acid (TPE-In-L), (3) indoline with Boc-protected propyl amine (TPE-In-Boc), (4) benzothaizole (TPE-B), and (5) quinaldine (TPE-Q). Interestingly, all five TPE analogues produced multiplexing Raman signal pattern, out of which TPE-In-Boc showed a significant increase in signal intensity in the fingerprint region. An efficient SERS nanoprobe has been constructed using gold nanoparticles as SERS substrate, and the TPE-In as the Raman reporter, which conjugated with a specific peptide substrate, Cys-Ser-Lys-Leu-Gln-OH, well-known for the recognition of prostate-specific antigen (PSA). The designated nanoprobe TPE-In-PSA@Au acted as SERS "ON/OFF" probe in peace with the vicinity of PSA protease, which distinctly recognizes PSA expression with a limit of detection of 0.5 ng in SERS platform. Furthermore, TPE-In-PSA@Au nanoprobe was efficiently recognized the overexpressed PSA in human LNCaP cells, which can be visualized through SERS spectral analysis and SERS mapping.

Formaldehyde (FA), a simple reactive carbonyl molecule, is endogenously produced in the cell at various physiological condition. At elevated level, FA causes severe cell toxicity as well as damage in macromolecules such proteins and DNA. For detecting FA in living cell, we identify a small but effective fluorescent turn on probe comprising single benzene-based orothophenylenediamine compound. Further study reveals that carboxylic group in orothophenylenediamine plays the important role in enhancing fluorescent signal than another electron withdrawing group. It is even interesting to observe the occurrence of fluorescent enhancement in glutathione (GSH) environment which is generally abundant in every cell. Our probe enables to detect FA over other bio-analytes efficiently with limit of detection of 123 nM and 355-fold of enhancement in cellular mimicking conditions. Moreover, this probe could be useful in discriminating cell that has high concentration of FA as well as GSH.

Alkaline phosphatase (ALP) is an enzyme that actively plays a significant role in the various metabolic processes by transferring a phosphate group to the protein, nucleic acid, etc. The elevated level of ALP in blood plasma is the hallmark of inflammation/cancer. The hyperactive mitochondria in cancer cells produce an excess of ATP to fulfill the high energy demand. Thus, we have developed a fluorescent probe Mito-Phos for ALP, which can detect phosphatase expression in mitochondria in live cells. The probe Mito-Phos has shown ~15-fold fluorescence intensity increments at 450 nm in the presence of 500 ng/mL of ALP. It takes about 60 min to consume the whole amount of ALP (500 ng/mL) in physiological buffer saline. It can selectively react with ALP even in the presence of other probable cellular reactive components. It is highly biocompatible and nontoxic to the live cells. It has shown ALP expression in a dose-dependent manner by providing concomitant fluorescence images in the blue-channel region. It has localized exclusively in the mitochondria in live cells. The probe Mito-Phos is highly biocompatible with the ability to assess ALP expression in mitochondria in live cells.