Toward gene therapy for growth hormone deficiency via salivary gland expression of growth hormone.

Abstract:

OBJECTIVES:Salivary glands are useful targets for gene therapeutics. After gene transfer into salivary glands, regulated secretory pathway proteins, such as human growth hormone, are secreted into saliva, whereas constitutive secretory pathway proteins, such as erythropoietin, are secreted into the bloodstream. Secretion of human growth hormone (hGH) into the saliva is not therapeutically useful. In this study, we attempted to redirect the secretion of transgenic hGH from the saliva to the serum by site-directed mutagenesis. MATERIALS AND METHODS:We tested hGH mutants first in vitro with AtT20 cells, a model endocrine cell line that exhibits polarized secretion of regulated secretory pathway proteins. Selected mutants were further studied in vivo using adenoviral-mediated gene transfer to rat submandibular glands. RESULTS:We identified two mutants with differences in secretion behavior compared to wild-type hGH. One mutant, ΔN1-6 , was detected in the serum of transduced rats, demonstrating that expression of this mutant in the salivary gland resulted in its secretion through the constitutive secretory pathway. CONCLUSION:This study demonstrates that mutagenesis of therapeutic proteins normally destined for the regulated secretory pathway may result in their secretion via the constitutive secretory pathway into the circulation for potential therapeutic benefit.

journal_name

Oral Dis

journal_title

Oral diseases

authors

Racz GZ,Zheng C,Goldsmith CM,Baum BJ,Cawley NX

doi

10.1111/odi.12217

subject

Has Abstract

pub_date

2015-03-01 00:00:00

pages

149-55

issue

2

eissn

1354-523X

issn

1601-0825

journal_volume

21

pub_type

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