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N-Acetyl Larazotide: Mechanisms and Therapeutic Potential in Intestinal Epithelial Barrier Function

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Abstract

N-acetyl larazotide (larazotide acetate) is an investigational octapeptide that modulates tight junctions (TJs) in intestinal epithelial cells, offering therapeutic potential in conditions characterized by increased intestinal permeability, such as celiac disease, inflammatory bowel disease, and acute pancreatitis. This article reviews larazotide’s mechanisms of action, including its role in TJ assembly, actin cytoskeleton rearrangement, and epithelial barrier restoration, based on in vitro and in vivo studies. The peptide’s efficacy in enhancing barrier integrity and reducing pathological permeability is discussed, highlighting its promise as a targeted treatment for gastrointestinal disorders.

Introduction

The intestinal epithelium serves as a critical barrier, regulating the selective permeability of nutrients while preventing the translocation of harmful luminal contents. Tight junctions (TJs) are integral to this barrier function, and their disruption is implicated in various gastrointestinal diseases. Larazotide acetate, a synthetic peptide derived from the zonula occludens toxin (Zot) of Vibrio cholerae, has emerged as a potential therapeutic agent that modulates TJs to restore barrier integrity. This review examines the effects of larazotide on intestinal epithelial cells and its therapeutic implications.

Mechanisms of Action

Tight Junction Assembly and Actin Cytoskeleton Rearrangement

Larazotide acetate promotes the assembly of TJs by enhancing the localization of TJ proteins such as zonula occludens-1 (ZO-1), occludin, and claudins at the cell membrane. In vitro studies using MDCK and Caco-2 cells demonstrated that larazotide facilitates the redistribution of these proteins to the junctional complex, thereby strengthening the epithelial barrier. Additionally, larazotide induces actin cytoskeleton rearrangement, which is essential for TJ integrity and function .

Inhibition of TJ Disruption by Gliadin and Cytokines

In celiac disease, gliadin peptides and pro-inflammatory cytokines disrupt TJs, leading to increased intestinal permeability. Larazotide acetate counteracts this effect by inhibiting the redistribution of TJ proteins and actin filaments induced by gliadin and cytokines. It prevents the decrease in transepithelial electrical resistance (TEER) and the opening of TJs, thereby maintaining barrier function .

Restoration of Barrier Function in Ischemic Injury

Larazotide has been shown to facilitate the recovery of TJ integrity following ischemic injury. In porcine models of jejunal ischemia, larazotide treatment enhanced TEER and reduced paracellular flux of lipopolysaccharides. The peptide promoted the localization of claudin-4, a sealing TJ protein, at the epithelial junctions, contributing to barrier restoration .

Therapeutic Applications

Celiac Disease

Clinical trials have evaluated larazotide acetate as an adjunct therapy for celiac disease. The peptide’s ability to prevent gliadin-induced TJ disruption suggests its potential to reduce gluten-induced symptoms in patients adhering to a gluten-free diet. Larazotide’s gut-restricted action minimizes systemic exposure, making it a promising candidate for long-term management of celiac disease .

Inflammatory Bowel Disease and Acute Pancreatitis

Beyond celiac disease, larazotide’s TJ-modulating effects have been explored in other inflammatory conditions. In rat models of acute pancreatitis, larazotide administration reduced intestinal permeability, bacterial translocation, and mucosal damage. These findings indicate its potential in mitigating systemic inflammatory responses associated with intestinal barrier dysfunction .

Radiation-Induced Enteropathy

Radiation therapy can compromise intestinal barrier function, leading to enteropathy. Larazotide treatment in irradiated mice preserved TJ protein expression and localization, reduced bacterial translocation, and improved histological outcomes. These results suggest that larazotide may protect against radiation-induced intestinal damage by maintaining epithelial integrity .

Conclusion

Larazotide acetate exhibits a multifaceted mechanism of action that reinforces intestinal epithelial barrier function by promoting TJ assembly and preventing disruption by pathogenic stimuli. Its efficacy in preclinical and clinical studies underscores its therapeutic potential in diseases characterized by increased intestinal permeability. Further research is warranted to fully elucidate its benefits and optimize its clinical applications.

References:

  1. Gopalakrishnan, S., et al. (2012). Larazotide acetate promotes tight junction assembly in epithelial cells. PubMed. https://pubmed.ncbi.nlm.nih.gov/22401910/
  2. Gopalakrishnan, S., et al. (2012). Larazotide acetate regulates epithelial tight junctions in vitro and in vivo. PubMed. https://pubmed.ncbi.nlm.nih.gov/22401908/
  3. Khaleghi, S., et al. (2016). The potential utility of tight junction regulation in celiac disease: focus on larazotide acetate. Therapeutic Advances in Gastroenterology. https://journals.sagepub.com/doi/full/10.1177/1756283X15616576
  4. Turner, J.R., et al. (2021). Larazotide acetate: a pharmacological peptide approach to tight junction regulation. American Journal of Physiology-Gastrointestinal and Liver Physiology. https://journals.physiology.org/doi/full/10.1152/ajpgi.00386.2020
  5. Demir, E., et al. (2024). Ameliorative effects of larazotide acetate on intestinal permeability and bacterial translocation in acute pancreatitis model in rats. PubMed. https://pubmed.ncbi.nlm.nih.gov/38441784/
  6. Lee, S.H., et al. (2021). Larazotide acetate induces recovery of ischemia-injured porcine jejunum via repair of tight junctions. PubMed. https://pubmed.ncbi.nlm.nih.gov/33886649/
  7. Lee, S.H., et al. (2021). Larazotide acetate induces recovery of ischemia-injured porcine jejunum via repair of tight junctions. PMC. https://pmc.ncbi.nlm.nih.gov/articles/PMC8061941/
  8. Lee, S.H., et al. (2021). Larazotide acetate induces recovery of ischemia-injured porcine jejunum via repair of tight junctions. PMC. https://pmc.ncbi.nlm.nih.gov/articles/PMC8061941/
  9. Lee, S.H., et al. (2021). Larazotide acetate induces recovery of ischemia-injured porcine jejunum via repair of tight junctions. PMC. https://pmc.ncbi.nlm.nih.gov/articles/PMC8061941/
  10. Lee, S.H., et al. (2021). Larazotide acetate induces recovery of ischemia-injured porcine jejunum via repair of tight junctions. PMC. https://pmc.ncbi.nlm.nih.gov/articles/PMC8061941/

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Termination of Agreement or Account

These Terms will take effect at the time you place an order, register, respond to a request for information, or begin downloading, accessing, or using the Website, whichever is earliest. BioLongevity Supplements reserves the right at any time and for any reason to deny you access to this Website or to any portion thereof, and BioLongevity Supplements shall have the right to immediately terminate a user’s account in the event of any conduct by a user which BioLongevity Supplements, in its sole discretion, considers to be unacceptable, or in the event of any breach of these Terms by a user. Termination will be effective with or without notice. You may also terminate this Agreement at any time by ceasing to use the Website, but all applicable provisions of these Terms will survive termination. The provisions concerning BioLongevity Supplements’s proprietary rights, Submissions, indemnity, disclaimers of warranty and liability, admissibility of these Terms, and governing law will survive the termination of these Terms for any reason.

Notice and Procedure for Making Claims of Copyright Infringement

If you believe that your copyrighted work has been used or displayed on our Website in a way that constitutes copyright infringement, please report the alleged infringements by completing the following steps and by notifying BioLongevity Supplements’s Designated Agent, as listed below. Pursuant to Title 17, United States Code, Section 512(c)(2), all notifications of claimed copyright infringement should be sent to ONLY our Designated Agent.

The Notification of Claimed Infringement must include the following:
• An electronic or physical signature of the owner or of the person authorized to act on behalf of the owner of the copyright interest;
• Identification of the copyrighted work (or works) that you claim has been infringed;
• A description and identification of the material that you claim is infringing, and the location where the original or an authorized copy of the copyrighted work exists (for example, the URL of the page of the website where it is lawfully posted; the name, edition and pages of a book from which an excerpt was copied, etc.);
• A clear description of where the infringing material is located on our Website, including as applicable its URL, so that we can locate the material;
• Your contact information, including your name, address, telephone number, and email address;
• A statement that you have a good faith belief that the disputed use is not authorized by the copyright owner, its agent, or the law; and
• A statement by you, made under penalty of perjury, that the above information in your notice is accurate and that you are the copyright owner or authorized to act on the copyright owner’s behalf.

Our agent designated to receive claims of copyright or other intellectual property infringement may be contacted as follows:

BioLongevity Supplements Legal Department
11273 Colinward Avenue
Las Vegas, NV 89135

Miscellaneous

Failure to insist on strict performance of any of these Terms will not operate as a waiver of any subsequent default or failure of performance. No waiver by BioLongevity Supplements of any right under these Terms will be deemed to be either a waiver of any other right or provision or a waiver of that same right or provision at any other time. If any part of these Terms is determined to be invalid or unenforceable pursuant to applicable law including, but not limited to, the warranty disclaimers and the liability limitations set forth above, then the invalid or unenforceable provision will be deemed superseded by a valid, enforceable provision that most clearly matches the intent of the original provision and the remainder of these Terms shall continue in effect. We may perform any of our obligations or exercise any of our rights under these Terms through one or more of our corporate affiliates (including any entity that directly or indirectly controls, is controlled by, or is under common control with us). If BioLongevity Supplements or its assets are acquired by another entity, that entity will assume our rights and obligations as described in these Terms. You may not assign your rights or obligations under these Terms, by operation of law or otherwise, without our prior written consent. Notwithstanding the foregoing, BioLongevity Supplements may assign this Agreement in whole or in part. Moreover, BioLongevity Supplements may delegate its rights and responsibilities or use contractors or agents to fulfill its obligations under this Agreement. No joint venture, partnership, employment, or agency relationship exists between you and BioLongevity Supplements as a result of these Terms or your use of this Website. These Terms, the BioLongevity Supplements Privacy Notice, and any other agreement or terms or conditions for services, subscriptions, or licenses for products or services available through the Website, which are all hereby incorporated by reference as if set forth fully herein, represent the entire agreement between you and BioLongevity Supplements with respect to use of the Website, and they supersede all prior or contemporaneous communications and proposals, whether electronic, oral, or written between you and BioLongevity Supplements, with respect to this Website.

Contact Us

Should you have other questions or concerns about these legal notices or the practices of this Website, or if you are interested in reprinting any of the content of this Website, please contact us at:

BioLongevity Supplements Legal Department
BioLongevity Labs II, LLC
11273 Colinward Avenue
Las Vegas, NV 89135

Or by email at [email protected]

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