Modulation of tight junctions by peptides to increase drug penetration across biological barriers

Bocsik Alexandra
Modulation of tight junctions by peptides to increase drug penetration across biological barriers.
Doctoral thesis (PhD), University of Szeged.
(2016) (Unpublished)

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Abstract in foreign language

Epithelial and endothelial cells form the anatomical and functional basis of biological barriers. The penetration of drugs across these barriers is limited due to closed intercellular gaps by tight junction proteins, and metabolic enzymes expressed in cells. These important barrier properties which on one hand provide protection, on the other hand prevent the effective treatment of several diseases. The paracellular permeability is one of the most important determinants of drug delivery across biological barriers and enhancing the permeability of drugs, especially large biopharmaceuticals is a great challenge in pharmaceutical research. In the case of biopharmacon delivery beside tight junctions enzymes of the metabolic barrier represent the most limiting factor, particularly at the BBB. We demonstrated the transfer of opiorphin, a bioactive peptide across a well characterized and validated co-culture BBB model. Our data also support, that opiorphin may have a potential for further development as a centrally acting novel drug for the treatment of pain or depression. One of the strategies to increase the penetration of large hydrophilic compounds is opening the paracellular gate by targeting TJ proteins. We studied six tight junction modulator peptides, ADT-6, HAV-6, C-CPE, AT-1002, 7-mer PN-78, PN159, which act on different targets, and compared their effects on intestinal epithelial and brain endothelial barriers. All peptides induced reversible opening of tight junctions as confirmed by different methods, but selectivity and differences in efficacy were observed. The targets of C-CPE, ADT-6 and HAV-6 peptides are expressed on epithelial cells which resulted in selective effects on epithelial cells. AT-1002 and 7-mer peptides caused enhanced permeability on both models but they were less effective on the intestinal barrier model. The selectivity of these peptides offers a great potential for innovative targeted drug delivery. PN159 peptide was the most effective permeability enhancer on both models: a rapid and reversible effect was found in low, non-toxic concentrations without permanent morphological changes. Potential targets of PN159 peptide were identified as claudin-1, -4, -5 and -7 but not claudin-3 by affinity measurement and molecular modeling. The secondary structure and the high thermostability of PN159 were also revealed, which can be important for the development of new pharmaceutical formulations and drug delivery systems. The presented results indicate that these peptides can be effectively and selectively used as potential pharmaceutical excipients to improve drug delivery across biological barriers.

Item Type: Thesis (Doctoral thesis (PhD))
Creators: Bocsik Alexandra
Hungarian title: Biológiai barriereken keresztüli gyógyszerbevitel fokozása szoros sejtközötti kapcsolatokat módosító peptidek segítségével
Supervisor(s):
Supervisor
Position, academic title, institution
MTMT author ID
Révész Piroska
egyetemi tanár, MTA doktor, SZTE GYTK Gyógyszertechnológiai Intézet
10003610
Deli Mária
tudományos tanácsadó, MTA doktor, MTA SZBK Biofizikai Intézet
10008996
Subjects: 03. Medical and health sciences > 03.01. Basic medicine > 03.01.06. Pharmacology and pharmacy
Divisions: Doctoral School of Pharmaceutical Sciences
Discipline: Medicine > Pharmacy
Language: English
Date: 2016. April 01.
Item ID: 2889
MTMT identifier of the thesis: 3105602
doi: https://doi.org/10.14232/phd.2889
Date Deposited: 2016. Mar. 23. 10:41
Last Modified: 2020. Apr. 29. 14:17
Depository no.: B 6002
URI: https://doktori.bibl.u-szeged.hu/id/eprint/2889
Defence/Citable status: Defended.

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