Steric forbiddance of amide conjugation in cyanamide vinylogs

1971 ◽  
Vol 20 (10) ◽  
pp. 2243-2243
Author(s):  
R. G. Kostyanovskii ◽  
Yu. I. El'natanov ◽  
K. S. Zakharov ◽  
V. M. Novikov ◽  
V. G. Plekhanov ◽  
...  
Keyword(s):  
Amide Conjugation

ChemInform Abstract: Weakening of Amide Conjugation with a Nitrogen Atom Included in a Four Membered Ring.

ChemInform ◽  
1988 ◽  
Vol 19 (6) ◽  
Author(s):  
R. K. ALEKPEROV ◽  
V. P. LESHCHINSKAYA ◽  
V. S. NOSOVA ◽  
I. I. CHERVIN ◽  
R. G. KOSTYANOVSKII
Keyword(s):  
Nitrogen Atom ◽  
Membered Ring ◽  
Amide Conjugation

Weakening of amide conjugation with a nitrogen atom included in a four-membered ring

1987 ◽  
Vol 23 (7) ◽  
pp. 749-751 ◽  
Author(s):  
R. K. Alekperov ◽  
V. P. Leshchinskaya ◽  
V. S. Nosova ◽  
I. I. Chervin ◽  
R. G. Kostyanovskii
Keyword(s):  
Nitrogen Atom ◽  
Membered Ring ◽  
Amide Conjugation

scholarly journals Design of Bio-Responsive Hyaluronic Acid–Doxorubicin Conjugates for the Local Treatment of Glioblastoma

Pharmaceutics ◽  
2022 ◽  
Vol 14 (1) ◽  
pp. 124
Author(s):  
Alessio Malfanti ◽  
Giuseppina Catania ◽  
Quentin Degros ◽  
Mingchao Wang ◽  
Mathilde Bausart ◽  
...  
Keyword(s):  
Hyaluronic Acid ◽  
Local Treatment ◽  
Treatment Strategies ◽  
Tumor Model ◽  
In Vitro Models ◽  
Drug Concentrations ◽  
Amide Conjugation ◽  
2D And 3D

Glioblastoma is an unmet clinical need. Local treatment strategies offer advantages, such as the possibility to bypass the blood–brain barrier, achieving high drug concentrations at the glioblastoma site, and consequently reducing systemic toxicity. In this study, we evaluated the feasibility of using hyaluronic acid (HA) for the local treatment of glioblastoma. HA was conjugated to doxorubicin (DOX) with distinct bio-responsive linkers (direct amide conjugation HA-NH-DOX), direct hydrazone conjugation (HA-Hz-DOX), and adipic hydrazone (HA-AdpHz-DOX). All HA-DOX conjugates displayed a small size (less than 30 nm), suitable for brain diffusion. HA-Hz-DOX showed the best performance in killing GBM cells in both 2D and 3D in vitro models and displayed superior activity in a subcutaneous GL261 tumor model in vivo compared to free DOX and other HA-DOX conjugates. Altogether, these results demonstrate the feasibility of HA as a polymeric platform for the local treatment of glioblastoma and the importance of rationally designing conjugates.

scholarly journals Carbon-based Fluorescent Antibody Nanoprobes as Brain Tumour Glioblastoma Diagnostics.

2021 ◽  
Author(s):  
Mattia Ghirardello ◽  
Radhe Shyam ◽  
Xia Liu ◽  
Teodoro Garcia Millan ◽  
Imke Sittel ◽  
...  
Keyword(s):  
Low Cost ◽  
Fluorescent Antibody ◽  
Glial Fibrillary Acid Protein ◽  
Tissue Samples ◽  
Normal Peripheral Blood ◽  
Fluorescent Reporters ◽  
New Class ◽  
Acid Protein ◽  
Amide Conjugation ◽  
Fluorescent Carbon Dots

The development of efficient and sensitive tools for the detection of brain cancer in patients is of the utmost importance particularly because many of these tumours go undiagnosed until the disease has advanced and when treatment is less effective. Current strategies employ antibodies (Abs) to detect Glial Fibrillary Acid Protein (GFAP) in tissue samples, since GFAP is unique to the brain and not present in normal peripheral blood and rely on fluorescent reporters. Herein we describe a low cost, practical and general method for the labelling of proteins and antibodies with fluorescent carbon dots (CD) to generate diagnostic probes that are robust, photostable and applicable to the clinical setting. The two-step protocol relies on the conjugation of a dibenzocyclooctyne (DBCO)-functionalised CD with azide functionalised proteins by combining amide conjugation and strain promoted alkyne-azide cycloaddition (SPAAC) ligation chemistry. The new class of Abs-CD conjugates developed using this strategy were used for the immunohistochemical staining of human brain tissues of patients with glioblastoma (GBM) to validate the approach. Overall, these novel fluorescent probes offer a promising and versatile strategy in terms of costs, photostability and applicability which can be extended to other Abs and protein systems.

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