TAILIEUCHUNG - Moncayo EJNMMI Research 2011, 1:9 http://www.ejnmmires.com/content/1/1/9 REVIEW Open

Moncayo EJNMMI Research 2011, 1:9 REVIEW Open Access Reflections on the theory of “silver bullet” octreotide tracers: implications for ligand-receptor interactions in the age of peptides, heterodimers, receptor mosaics, truncated receptors, and multifractal analysis Roy Moncayo1,2 Abstract The classical attitude of Nuclear Medicine practitioners on matters of peptide-receptor interactions has maintained an intrinsic monogamic character since many years. New advances in the field of biochemistry and even in clinical Nuclear Medicine have challenged this type of thinking, which prompted me to work on this review. The central issue of this paper will be the use of somatostatin analogs, ., octreotide, in clinical imaging procedures. | Moncayo EJNMMI Research 2011 1 9 http content 1 1 9 9 EJNMMI Research a SpringerOpen Journal REVIEW Open Access Reflections on the theory of silver bullet octreotide tracers implications for ligand-receptor interactions in the age of peptides heterodimers receptor mosaics truncated receptors and multifractal analysis Roy Moncayo1 2 Abstract The classical attitude of Nuclear Medicine practitioners on matters of peptide-receptor interactions has maintained an intrinsic monogamic character since many years. New advances in the field of biochemistry and even in clinical Nuclear Medicine have challenged this type of thinking which prompted me to work on this review. The central issue of this paper will be the use of somatostatin analogs . octreotide in clinical imaging procedures as well as in relation to neuroendocirne tumors. Newly described characteristics of G-protein coupled receptors such as the formation of receptor mosaics will be discussed. A small section will enumerate the regulatory processes found in the cell membrane. Possible new interpretations other than tumor detection based on imaging procedures with somatostatin analogs will be presented. The readers will be taken to situations such as inflammation nociception mechanosensing chemosensing fibrosis taste and vascularity where somatostatin is involved. Thyroid-associated orbitopathy will be used as a model for the development of multi-agent therapeutics. The final graphical summary depicts the multifactorial properties of ligand binding. Keywords Michaelis-Menten ligand receptor GPCR somatostatin octreotide homodimers heterodimers receptor mosaics multifractal analysis morphogens morphostats The setting In past issues of the European Journal of Nuclear Medicine and Molecular Imaging some articles have pointed out puzzling aspects concerning ligand-receptor interactions. Rolleman et al. have documented the situation of an apparent positive cooperation between non-labeled somatostatin

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