**Rapid Two-Photon Fluorescence Imaging of Monoamine Oxidase B for Early Diagnosis of Liver Fibrosis in Mice**

Liver fibrosis, a progressive pathological condition triggered by chronic liver injury, often leads to cirrhosis and hepatocellular carcinoma if left untreated. Early diagnosis is critical for effective intervention and improved patient outcomes. However, current diagnostic methods such as liver biopsy are invasive, carry risks of complications, and lack repeatability. Non-invasive imaging techniques like ultrasound and CT suffer from poor sensitivity and specificity in detecting early-stage fibrosis. Therefore, there is an urgent need for accurate, non-invasive, and real-time diagnostic tools.

Monoamine oxidase B (MAO-B), a flavin-dependent enzyme overexpressed in early-stage liver fibrosis, has emerged as a promising biomarker. Its elevated activity correlates with hepatic stellate cell activation and excessive collagen deposition—hallmarks of fibrogenesis. Despite its potential, existing detection strategies for MAO-B are limited by slow reaction kinetics, low sensitivity, or poor spatial resolution, hindering their clinical utility.ANXA5 Antibody Purity

To address these challenges, we developed a novel two-photon fluorescence imaging platform based on a simple, rationally designed probe named BiPhAA. This probe consists of a benzylamine moiety linked to 2-aminobenzeneboronic acid via Suzuki coupling. Upon exposure to MAO-B, the benzylamine group is specifically oxidized to an aldehyde, which then reacts intramolecularly with the adjacent amino group to form a conjugated imine system. This structural transformation dramatically enhances fluorescence emission at 520 nm under 490 nm excitation, resulting in a bright turn-on signal within just 10 minutes—making it significantly faster than previously reported probes that require up to 2 hours.

The probe exhibits high selectivity for MAO-B over other enzymes, amino acids, metal ions, and reactive oxygen species, as confirmed through extensive control experiments. In vitro assays demonstrated a linear response to MAO-B concentrations ranging from 0 to 2.0 ng/L, with a detection limit as low as 0.02 ng/L. Moreover, BiPhAA showed excellent photostability and minimal cytotoxicity in both LX-2 hepatic stellate cells and HL7702 hepatocytes, indicating strong biocompatibility.hnRNP U Antibody Purity & Documentation

We further validated the probe’s performance in living cells using two-photon microscopy.PMID:35143137 Real-time imaging revealed a significant increase in fluorescence intensity in control cells incubated with BiPhAA, while pretreatment with the selective inhibitor D-penicillamine drastically reduced signal output. These results were corroborated by enzyme activity assays, confirming that fluorescence changes directly reflect MAO-B activity.

In vivo applications were conducted using a carbon tetrachloride (CCl₄)-induced mouse model of liver fibrosis. After tail vein injection of BiPhAA, two-photon imaging of deep liver tissues showed approximately six-fold higher fluorescence intensity in fibrotic mice compared to normal controls. The signal was effectively suppressed in mice pre-treated with D-penicillamine, confirming the specificity of the probe. Additionally, ex vivo imaging using the IVIS system confirmed the same trend, with strong fluorescence in fibrotic livers and weak signals in inhibitor-treated samples.

These findings demonstrate that BiPhAA enables rapid, sensitive, and specific two-photon fluorescence imaging of endogenous MAO-B activity in live animals. Its ability to distinguish early-stage liver fibrosis from normal tissue in real time offers a powerful tool for non-invasive diagnosis. By visualizing MAO-B dynamics in situ, this method not only facilitates early detection but also provides insights into the molecular mechanisms underlying liver fibrosis progression. We believe BiPhAA holds great promise for future translation into clinical diagnostics and therapeutic monitoring.MedChemExpress (MCE) offers a wide range of high-quality research chemicals and biochemicals (novel life-science reagents, reference compounds and natural compounds) for scientific use. We have professionally experienced and friendly staff to meet your needs. We are a competent and trustworthy partner for your research and scientific projects.Related websites: https://www.medchemexpress.com

Bristol-Myers Squibb (BMS)-derived indole-glyoxamide compounds, known as HIV entry inhibitors (ENIs), have been modified through strategic conjugation to polyol scaffolds such as β-cyclodextrin and hyperbranched polyglycerol (HPG) via click chemistry. These modifications were designed to enhance the potential of these molecules as next-generation vaginal microbicides—specifically, fourth-generation candidates capable of blocking HIV-1 at the initial stage of infection. The key innovation lies in linking the BMS-like pharmacophores to the C7 position of the indole ring, a site previously identified as optimal for attachment due to its favorable interaction with the gp120 glycoprotein of HIV-1. This approach preserves antiviral activity while improving delivery properties.

The synthesis began with the preparation of indole-3-glyoxylic acid derivatives bearing aliphatic spacers ending in either azide or activated alkyne groups, enabling Cu(I)-catalyzed azide-alkyne cycloaddition (CuAAC). These functionalized BMS analogues were then reacted with propargylated β-cyclodextrin (8) and propargylated HPG (11), yielding conjugates 9 and 12, respectively. Additionally, a thiol-functionalized HPG derivative was synthesized and conjugated to an alkyne-containing BMS analogue via Michael addition under physiological conditions, producing compound 14. All resulting conjugates were characterized using MALDI-TOF/TOF mass spectrometry, confirming successful incorporation of multiple BMS units onto the polymer backbones.

Toxicity assessments were conducted using TZM.bl cells, a human cervical epithelial cell line commonly used in HIV research. None of the conjugates—9, 10, 12, or 14—showed cytotoxicity at concentrations up to 100 μM, indicating excellent biocompatibility. Notably, the unmodified β-cyclodextrin, its propargylated form, HPG, and its derivatives also exhibited no toxicity, reinforcing the safety profile of the scaffold materials.

Antiviral efficacy was evaluated against R5-tropic HIV-1NLAD8, a clinically relevant strain responsible for primary infection. At non-toxic concentrations, all conjugates demonstrated significant inhibition of viral entry, with inhibition rates comparable to those of the reference carbosilane-polysulfonate dendrimer G2-S16 (a known ENI active in the nanomolar range). Even at 1 μM, conjugates 9 and 12 retained high potency, showing only slightly reduced activity compared to the unsubstituted parent compound 3.SF3A1 Antibody medchemexpress This suggests that conjugation does not compromise the intrinsic antiviral mechanism of the BMS scaffold.CK II alpha Antibody Formula

These results highlight the feasibility of creating multifunctional, low-toxicity microbicide platforms by anchoring potent ENIs to biocompatible polymers.PMID:35046697 The ability of these constructs to maintain anti-HIV activity despite structural modification opens new avenues for developing long-acting, user-controlled prevention strategies. Future work will focus on optimizing molecular weight, increasing ligand density, and testing against diverse HIV-1 strains to advance toward clinical application. This study establishes a strong proof-of-concept for fourth-generation microbicides based on click-chemistry-linked BMS derivatives.MedChemExpress (MCE) offers a wide range of high-quality research chemicals and biochemicals (novel life-science reagents, reference compounds and natural compounds) for scientific use. We have professionally experienced and friendly staff to meet your needs. We are a competent and trustworthy partner for your research and scientific projects.Related websites: https://www.medchemexpress.com

The development of efficient and sustainable photocatalytic systems is critical for addressing persistent organic pollutants like tetracycline (TC) in aquatic environments. In this study, a novel hybrid photocatalyst, phosphorus-doped graphitic carbon nitride functionalized PeCoFe2O4 (PeCoFe2O4@GCN), was successfully synthesized via a facile thermal polymerization method. The composite combines the strong magnetic properties of CoFe2O4 with the visible-light-responsive capabilities of graphitic carbon nitride (GCN), enhanced by phosphorus doping. Characterization results confirmed the successful integration of CoFe2O4 nanoparticles into the GCN matrix, as evidenced by TEM and SEM analyses showing uniform distribution and core-shell morphology.CD34 Antibody medchemexpress The BET surface area of PeCoFe2O4@GCN-1 reached 36.RAN Antibody Purity 91 m²/g—5.38 times higher than that of pristine GCN—indicating significantly improved surface reactivity and active site availability.

Under visible light irradiation, PeCoFe2O4@GCN-1 demonstrated exceptional photocatalytic performance, achieving 96.2% TC degradation within 60 minutes, which is 3.19 times higher than pure GCN. This enhancement is attributed to the synergistic effects of improved charge separation, extended visible light absorption, and increased surface area due to phosphorus doping. Electron spin resonance (ESR) analysis revealed that photogenerated holes (h⁺), superoxide radicals (O₂⁻), and hydroxyl radicals (OH•) were the dominant reactive species responsible for TC decomposition.PMID:35241543 To further enhance efficiency, persulfate (PS) was introduced as a green advanced oxidation process (AOP). Response surface methodology (RSM) was employed to optimize the PS activation system, leading to a predicted maximum TC removal of 99.6% within just 30 minutes under optimal conditions: PS concentration of 1.67 mM, pH of 6.51, and temperature of 19.24°C.

The degradation mechanism was investigated using HPLC-MS, which identified seven intermediate products during TC breakdown. The proposed pathway involves initial dihydroxylation at C atoms, followed by deamination, ring opening, and progressive fragmentation into low-molecular-weight compounds, ultimately mineralizing into CO₂ and H₂O. ESR and scavenger experiments confirmed that h⁺, O₂⁻, OH•, and SO₄⁻• radicals played pivotal roles in the degradation process, particularly when PS was activated. Moreover, the catalyst exhibited excellent stability and recyclability, maintaining 89.1% TC removal after five consecutive cycles, with no significant structural changes observed via XRD. These findings highlight PeCoFe2O4@GCN as a promising, magnetically separable, and highly efficient photocatalyst for environmental remediation applications, offering a viable solution for the sustainable removal of antibiotic pollutants from water sources.MedChemExpress (MCE) offers a wide range of high-quality research chemicals and biochemicals (novel life-science reagents, reference compounds and natural compounds) for scientific use. We have professionally experienced and friendly staff to meet your needs. We are a competent and trustworthy partner for your research and scientific projects.Related websites: https://www.medchemexpress.com

Product Name :
Cathelicidin-1

Brief Description :
Recombinant Protein

Accession No. :
Uniprot ID:Q6QLQ5

Calculated MW :

Target Sequence :

Storage :
Store at -20˚C. (Avoid repeated freezing and thawing.)

Application Details :
Storage Buffer:50mM NaH2PO4, 500mM NaCl Buffer with 500mM Imidazole,10%glycerol(PH8.0)gene_full_name:CATHL1

Uniprot :
Q6QLQ5

MedChemExpress (MCE) recombinant proteins include: cytokines, enzymes, growth factors, hormones, receptors, transcription factors, antibody fragments, etc. They are often essential for supporting cell growth, stimulating cell signaling pathways, triggering or inhibiting cell differentiation; and are useful tools for elucidating protein structure and function, understanding disease onset and progression, and validating pharmaceutical targets. At MedChemExpress (MCE), we strive to provide products with only the highest quality. Protein identity, purity and biological activity are assured by our robust quality control and assurance procedures.
Related category websites: https://www.medchemexpress.com/recombinant-proteins.html
STAT5a Antibody Epigenetic Reader Domain CASP3 Antibody References PMID:35018513 MedChemExpress (MCE) offers a wide range of high-quality research chemicals and biochemicals (novel life-science reagents, reference compounds and natural compounds) for scientific use. We have professionally experienced and friendly staff to meet your needs. We are a competent and trustworthy partner for your research and scientific projects.Related websites: https://www.medchemexpress.com

Product Name :
Chitinase-3-like protein 1

Brief Description :
Recombinant Protein

Accession No. :
Uniprot ID:Q29411

Calculated MW :

Target Sequence :

Storage :
Store at -20˚C. (Avoid repeated freezing and thawing.)

Application Details :
Storage Buffer:50mM NaH2PO4, 500mM NaCl Buffer with 500mM Imidazole,10%glycerol(PH8.0)gene_full_name:CHI3L1

Uniprot :
Q29411

MedChemExpress (MCE) recombinant proteins include: cytokines, enzymes, growth factors, hormones, receptors, transcription factors, antibody fragments, etc. They are often essential for supporting cell growth, stimulating cell signaling pathways, triggering or inhibiting cell differentiation; and are useful tools for elucidating protein structure and function, understanding disease onset and progression, and validating pharmaceutical targets. At MedChemExpress (MCE), we strive to provide products with only the highest quality. Protein identity, purity and biological activity are assured by our robust quality control and assurance procedures.
Related category websites: https://www.medchemexpress.com/recombinant-proteins.html
4-Bromobutan-1-amine medchemexpress ZRANB1 Antibody Technical Information PMID:35262828 MedChemExpress (MCE) offers a wide range of high-quality research chemicals and biochemicals (novel life-science reagents, reference compounds and natural compounds) for scientific use. We have professionally experienced and friendly staff to meet your needs. We are a competent and trustworthy partner for your research and scientific projects.Related websites: https://www.medchemexpress.com

The success of metal-organic frameworks (MOFs) in analytical separations hinges critically on their ability to precisely control pore size and geometry, which govern molecular recognition, diffusion kinetics, and selectivity. By engineering these structural parameters through strategic selection of metal centers, organic ligands, and stacking configurations, researchers can tailor MOFs for specific separation tasks across gas chromatography (GC), high-performance liquid chromatography (HPLC), and biomolecule enrichment.

In GC, pore size directly determines the molecular sieving effect essential for separating isomers with similar physical properties. Zeolitic imidazolate frameworks (ZIFs) exemplify this principle: ZIF-8 (3.4 Å window) effectively separates linear alkanes from branched isomers by excluding bulkier molecules, while ZIF-7 (2.9 Å) is too small even for linear chains, rendering it ineffective. This contrast highlights how subtle changes in ligand structure dramatically alter functionality. Similarly, SIFSIX-3-Zn, with a 3.8 Å aperture, achieves shape-selective separation of alkane isomers by allowing only linear chains to enter while excluding branched analogs.30562-34-6 InChIKey The resolution of octane, nonane, and decane isomers demonstrates that ultramicroporosity enables fine discrimination based on chain length and branching pattern.

Beyond simple pore size, pore geometry significantly influences separation efficiency. MOF-5 and MOF-monoclinic, despite sharing identical Zn²⁺ clusters and terephthalic acid linkers, differ in secondary building units (SBUs) and pore shapes—cubic (12 Å cross-section) versus triangular (7 Å). On MOF-5, all xylene isomers elute rapidly due to large accessible pores, resulting in poor selectivity. In contrast, MOF-monoclinic’s smaller triangular pores favor p-xylene, which fits best, leading to longer retention times and enhanced differentiation. This behavior aligns with McReynolds constants indicating higher polarity and stronger interactions, confirming that geometric constraints dictate analyte affinity.

In HPLC, controlled pore refinement enables selective separation of structurally similar compounds. Cui et al. synthesized three chiral Zr-MOFs with identical topologies but varying pore sizes via ligand modification. These MOFs achieved complete separation of racemates, with resolution correlating directly with pore dimensions. MFM-300(M) series (M = Al, Fe, V, In) further demonstrate sub-angstrom precision: pore size varies from 6.5 to 7.4 Å due to differences in metal radius and ligand orientation, enabling kinetic molecular sieving of xylene isomers. Notably, MFM-300(In) with the largest pore resolved m-xylene completely, attributed to both steric fit and slower diffusion.

Two-dimensional (2D) MOF nanosheets offer an additional dimension of control. Stacking mode—twisted versus untwisted—dictates interlayer distance and pore uniformity. Untwisted Zr-BTB-FA nanosheets exhibit ordered sub-nanometer pores (~8.8 Å), enabling baseline separation of six substituted aromatic isomer mixtures. In contrast, twisted counterparts show larger, disordered spacing (~11.7 Å), reducing resolution. This difference underscores the importance of long-range order in achieving consistent and reproducible separations.98327-87-8 supplier

For biomolecule enrichment, pore size dictates exclusion of large proteins while capturing target peptides.PMID:29697234 MIL-53 (17 Å), MIL-100 (5.6–8.6 Å), and MIL-101 (12–16 Å) exhibit distinct enrichment profiles: larger pores favor higher molecular weight peptides, while smaller ones selectively capture low-mass species. After washing, narrow pores exclude proteins >10 kDa, enabling clean enrichment without interference.

In summary, optimizing pore size and geometry in MOFs involves precise manipulation of metal-ligand combinations, coordination networks, and supramolecular organization. Whether through ligand design, metal substitution, or nanostructure engineering, controlling these features allows for rational development of high-performance stationary phases and absorbents. As analytical demands grow more complex, such tailored MOFs will play an increasingly central role in advancing separation science across pharmaceutical, environmental, and biological applications.MedChemExpress (MCE) offers a wide range of high-quality research chemicals and biochemicals (novel life-science reagents, reference compounds and natural compounds) for scientific use. We have professionally experienced and friendly staff to meet your needs. We are a competent and trustworthy partner for your research and scientific projects.Related websites: https://www.medchemexpress.com

Product Name :
Hematopoietic progenitor cell antigen CD34

Brief Description :
Recombinant Protein

Accession No. :
Uniprot ID:Q28270

Calculated MW :

Target Sequence :

Storage :
Store at -20˚C. (Avoid repeated freezing and thawing.)

Application Details :
Storage Buffer:50mM NaH2PO4, 500mM NaCl Buffer with 500mM Imidazole,10%glycerol(PH8.0)gene_full_name:CD34

Uniprot :
Q28270

MedChemExpress (MCE) recombinant proteins include: cytokines, enzymes, growth factors, hormones, receptors, transcription factors, antibody fragments, etc. They are often essential for supporting cell growth, stimulating cell signaling pathways, triggering or inhibiting cell differentiation; and are useful tools for elucidating protein structure and function, understanding disease onset and progression, and validating pharmaceutical targets. At MedChemExpress (MCE), we strive to provide products with only the highest quality. Protein identity, purity and biological activity are assured by our robust quality control and assurance procedures.
Related category websites: https://www.medchemexpress.com/recombinant-proteins.html
SOCS-3 Antibody supplier NUDT21 Antibody supplier PMID:35041110 MedChemExpress (MCE) offers a wide range of high-quality research chemicals and biochemicals (novel life-science reagents, reference compounds and natural compounds) for scientific use. We have professionally experienced and friendly staff to meet your needs. We are a competent and trustworthy partner for your research and scientific projects.Related websites: https://www.medchemexpress.com

Product Name :
C-C motif chemokine 28

Brief Description :
Recombinant Protein

Accession No. :
Uniprot ID:Q9JIL2

Calculated MW :

Target Sequence :

Storage :
Store at -20˚C. (Avoid repeated freezing and thawing.)

Application Details :
Storage Buffer:50mM NaH2PO4, 500mM NaCl Buffer with 500mM Imidazole,10%glycerol(PH8.0)gene_full_name:Ccl28

Uniprot :
Q9JIL2

MedChemExpress (MCE) recombinant proteins include: cytokines, enzymes, growth factors, hormones, receptors, transcription factors, antibody fragments, etc. They are often essential for supporting cell growth, stimulating cell signaling pathways, triggering or inhibiting cell differentiation; and are useful tools for elucidating protein structure and function, understanding disease onset and progression, and validating pharmaceutical targets. At MedChemExpress (MCE), we strive to provide products with only the highest quality. Protein identity, purity and biological activity are assured by our robust quality control and assurance procedures.
Related category websites: https://www.medchemexpress.com/recombinant-proteins.html
COX6B2 Antibody supplier WS6 Data Sheet PMID:34994666 MedChemExpress (MCE) offers a wide range of high-quality research chemicals and biochemicals (novel life-science reagents, reference compounds and natural compounds) for scientific use. We have professionally experienced and friendly staff to meet your needs. We are a competent and trustworthy partner for your research and scientific projects.Related websites: https://www.medchemexpress.com

P-glycoprotein (Pgp), encoded by the ABCB1 gene, is a well-characterized efflux transporter responsible for multidrug resistance (MDR) in cancer cells. This study investigates the functional and molecular role of Pgp in mediating resistance to chemotherapeutic agents in human colorectal adenocarcinoma HCT116 cells. Using two independently derived resistant sublines—HCT116tax (paclitaxel-resistant) and HCT116nut (Nutlin-3a-resistant)—we systematically evaluated the contribution of Pgp to drug efflux, cross-resistance, and survival under therapeutic stress.

Functional assays using Hoechst 33342 accumulation revealed that both resistant lines exhibited significantly reduced intracellular dye retention compared to parental HCT116wt cells. This reduction was most pronounced in HCT116tax, suggesting enhanced efflux activity. Inhibition experiments with tariquidar—a specific Pgp blocker—resulted in a 1.9-fold increase in Hoechst fluorescence in HCT116tax cells, confirming Pgp-mediated efflux. Sodium orthovanadate, a broad-spectrum inhibitor of ATP-dependent transporters, also increased dye retention, particularly in HCT116tax (2.3-fold), indicating involvement of additional ABC transporters beyond Pgp.

Gene expression analysis via real-time RT-PCR showed marked upregulation of ABCB1 mRNA in both resistant lines: 10-fold in HCT116tax and 19-fold in HCT116nut. Western blotting corroborated these findings, demonstrating elevated Pgp protein levels in resistant cells. The correlation between increased Pgp expression and enhanced efflux confirms its central role in MDR. Moreover, pharmacological inhibition of Pgp with tariquidar restored sensitivity to paclitaxel and Nutlin-3a in resistant cells, as evidenced by decreased GI50 values and increased apoptosis rates.

Interestingly, while HCT116nut cells were highly resistant to Nutlin-3a (RI = 4.1), they also showed moderate resistance to paclitaxel (RI = 1.6). Conversely, HCT116tax cells displayed strong resistance to paclitaxel (RI = 3.2) and notable cross-resistance to Nutlin-3a (RI = 1.9). These data suggest that Pgp activation confers non-selective protection against diverse drugs, regardless of mechanism of action. The ability of Pgp to export structurally unrelated compounds—including cytostatics, targeted agents, and fluorescent dyes—underscores its role as a universal defense system.

Apoptosis analysis using Muse Annexin V & Dead Cell Kit revealed that resistant cells had significantly lower levels of early and late apoptosis after treatment with either agent.182498-32-4 SMILES This was consistent with reduced drug accumulation due to active efflux.1643489-24-0 SMILES Cell cycle analysis further confirmed delayed G2/M arrest in paclitaxel-treated resistant cells, reinforcing the notion that diminished intracellular drug concentration impairs mitotic disruption.PMID:30725832

These results demonstrate that P-glycoprotein is a dominant mediator of multidrug resistance in colorectal cancer cells. Its overexpression not only reduces the efficacy of primary therapies but also undermines subsequent treatments through cross-resistance. Targeting Pgp with inhibitors such as tariquidar may reverse resistance and enhance therapeutic outcomes. The established resistant cell models provide essential tools for evaluating next-generation MDR modulators and designing rational combination regimens aimed at overcoming efflux-mediated resistance in colon cancer.MedChemExpress (MCE) offers a wide range of high-quality research chemicals and biochemicals (novel life-science reagents, reference compounds and natural compounds) for scientific use. We have professionally experienced and friendly staff to meet your needs. We are a competent and trustworthy partner for your research and scientific projects.Related websites: https://www.medchemexpress.com

Product Name :
Mast cell carboxypeptidase A

Brief Description :
Recombinant Protein

Accession No. :
Uniprot ID:P21961

Calculated MW :

Target Sequence :

Storage :
Store at -20˚C. (Avoid repeated freezing and thawing.)

Application Details :
Storage Buffer:50mM NaH2PO4, 500mM NaCl Buffer with 500mM Imidazole,10%glycerol(PH8.0)gene_full_name:Cpa3

Uniprot :
P21961

MedChemExpress (MCE) recombinant proteins include: cytokines, enzymes, growth factors, hormones, receptors, transcription factors, antibody fragments, etc. They are often essential for supporting cell growth, stimulating cell signaling pathways, triggering or inhibiting cell differentiation; and are useful tools for elucidating protein structure and function, understanding disease onset and progression, and validating pharmaceutical targets. At MedChemExpress (MCE), we strive to provide products with only the highest quality. Protein identity, purity and biological activity are assured by our robust quality control and assurance procedures.
Related category websites: https://www.medchemexpress.com/recombinant-proteins.html
Linezolid Technical Information VEGFA Antibody web PMID:34279728 MedChemExpress (MCE) offers a wide range of high-quality research chemicals and biochemicals (novel life-science reagents, reference compounds and natural compounds) for scientific use. We have professionally experienced and friendly staff to meet your needs. We are a competent and trustworthy partner for your research and scientific projects.Related websites: https://www.medchemexpress.com