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Polymer Classification: Architecture01:14

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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Cellular Response to Linear and Branched Poly(acrylic acid).

Elizabeth G Whitty1,2,3, Alison R Maniego1,2,3, Sharon A Bentwitch1,2,3

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Poly(acrylic acid-co-sodium acrylate) (PNaA) polymers show potential for anticancer drug delivery. However, their cytotoxicity and cellular effects require careful evaluation, as some assays may be misleading.

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MTT assaycapillary electrophoresiscellcytotoxicitypoly(acrylic acid)/poly(sodium acrylate)

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Area of Science:

  • Biomaterials Science
  • Polymer Chemistry
  • Nanomedicine

Background:

  • pH-responsive polymers like Poly(acrylic acid-co-sodium acrylate) (PNaA) are explored for targeted anticancer drug delivery.
  • Understanding the cytotoxicity and intracellular interactions of different PNaA architectures is crucial for their biomedical application.

Purpose of the Study:

  • To investigate the cytotoxicity and intracellular effects of various Poly(acrylic acid-co-sodium acrylate) (PNaA) polymer architectures (3-arm star, hyperbranched, linear).
  • To assess the interactions of PNaA with serum proteins and evaluate its suitability for use in cell-based assays.
  • To explore the impact of PNaA on cellular morphology and lipid organization.

Main Methods:

  • Cytotoxicity assessment using MTT assays on L1210 progenitor leukemia and L6 myoblast cells.
  • Analysis of PNaA-serum protein interactions via free solution capillary electrophoresis.
  • Intracellular effects visualized using fluorescent confocal microscopy.

Main Results:

  • Most PNaA formulations exhibited an IC50 between 7 and 14 mmol L(-1) in MTT assays, suggesting precipitation might aid purification.
  • Dialyzed star and hyperbranched PNaA increased L6 cell viability, questioning the reliability of MTT assays for PNaA.
  • PNaA exposure led to cellular lipid merging, potentially due to serum starvation induced by polymer-protein interactions.

Conclusions:

  • The cytotoxicity of PNaA varies with its architecture and purification method.
  • The MTT assay may not be suitable for evaluating PNaA cytotoxicity due to potential interference and altered cell viability.
  • PNaA interactions with cellular components, like lipids, warrant further investigation for drug delivery applications.