Cationic Polyamidoamine Dendrimers as Modulators of EGFR Signaling In Vitro and In Vivo

被引:19
作者
Akhtar, Saghir [1 ]
Al-Zaid, Bashayer [1 ]
El-Hashim, Ahmed Z. [2 ]
Chandrasekhar, Bindu [1 ]
Attur, Sreeja [1 ]
Yousif, Mariam H. M. [1 ]
Benter, Ibrahim F. [1 ,3 ]
机构
[1] Kuwait Univ, Fac Med, Dept Pharmacol & Toxicol, Safat 13110, Jabriya, Kuwait
[2] Kuwait Univ, Fac Pharm, Dept Pharmacol & Therapeut, Safat 13110, Jabriya, Kuwait
[3] Eastern Mediterranean Univ, Fac Med, Gazimagusa, North Cyprus, Cyprus
来源
PLOS ONE | 2015年 / 10卷 / 07期
关键词
GROWTH-FACTOR RECEPTOR; DRUG-DELIVERY SYSTEMS; PAMAM DENDRIMERS; GENE-EXPRESSION; POLY(AMIDOAMINE) DENDRIMERS; DIABETIC-NEPHROPATHY; TOXICOGENOMICS; MECHANISMS; POLYMERS; TRANSACTIVATION;
D O I
10.1371/journal.pone.0132215
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Cationic polyamidoamine (PAMAM) dendrimers are branch-like spherical polymers being investigated for a variety of applications in nanomedicine including nucleic acid drug delivery. Emerging evidence suggests they exhibit intrinsic biological and toxicological effects but little is known of their interactions with signal transduction pathways. We previously showed that the activated (fragmented) generation (G) 6 PAMAM dendrimer, Superfect (SF), stimulated epidermal growth factor receptor (EGFR) tyrosine kinase signaling-an important signaling cascade that regulates cell growth, survival and apoptosis-in cultured human embryonic kidney (HEK 293) cells. Here, we firstly studied the in vitro effects of Polyfect (PF), a non-activated (intact) G6 PAMAM dendrimer, on EGFR tyrosine kinase signaling via extracellular-regulated kinase 1/2 (ERK1/2) and p38 mitogen-activated protein kinase (MAPK) in cultured HEK 293 cells and then compared the in vivo effects of a single administration (10mg/kg i.p) of PF or SF on EGFR signaling in the kidneys of normal and diabetic male Wistar rats. Polyfect exhibited a dose- and time-dependent inhibition of EGFR, ERK1/2 and p38 MAPK phosphorylation in HEK-293 cells similar to AG1478, a selective EGFR inhibitor. Administration of dendrimers to non-diabetic or diabetic animals for 24h showed that PF inhibited whereas SF stimulated EGFR phosphorylation in the kidneys of both sets of animals. PF-mediated inhibition of EGFR phosphorylation as well as SF or PF-mediated apoptosis in HEK 293 cells could be significantly reversed by co-treatment with antioxidants such as tempol implying that both these effects involved an oxidative stress-dependent mechanism. These results show for the first time that SF and PF PAMAM dendrimers can differentially modulate the important EGFR signal transduction pathway in vivo and may represent a novel class of EGFR modulators. These findings could have important clinical implications for the use of PAMAM dendrimers in nanomedicine.
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页数:22
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