Pharmacological characterization of a recombinant, fluorescent somatostatin receptor agonist

Varun K A Sreenivasan, Oleg A. Stremovskiy, Timothy A. Kelf, Marika Heblinski, Ann K. Goodchild, Mark Connor, Sergey M. Deyev, Andrei V. Zvyagin

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)


Somatostatin (SST) is a peptide neurotransmitter/hormone found in several mammalian tissue types. Apart from its natural importance, labeled SST/analogues are utilized in clinical applications such as targeting/diagnosis of neuroendocrine tumors. We report on the development and characterization of a novel, recombinant, fluorescent somatostatin analogue that has potential to elucidate somatostatin-activated cell signaling. SST was genetically fused with a monomeric-red fluorescent protein (mRFP) as the fluorescent label. The attachment of SST to mRFP had no detectable effect on its fluorescent properties. This analogue's potency to activate the endogenous and transfected somatostatin receptors was characterized using assays of membrane potential and Ca 2+ mobilization and immunocytochemistry. SST-mRFP was found to be an effective somatostatin receptor agonist, able to trigger the membrane hyperpolarization, mobilization of the intracellular Ca 2+ and receptor-ligand internalization in cells expressing somatostatin receptors. This complex represents a novel optical reporter due to its red emission spectral band suitable for in vivo imaging and tracking of the somatostatin receptor signaling pathways, affording higher resolution and sensitivity than those of the state-of-the-art radiolabeling bioassays.

Original languageEnglish
Pages (from-to)1768-1775
Number of pages8
JournalBioconjugate Chemistry
Issue number9
Publication statusPublished - 21 Sep 2011
Externally publishedYes

ASJC Scopus subject areas

  • Biotechnology
  • Bioengineering
  • Biomedical Engineering
  • Pharmacology
  • Pharmaceutical Science
  • Organic Chemistry

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