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Adrenomedullin 5

Central and peripheral cardiovascular actions of adrenomedullin 5, a novel member of the calcitonin gene-related peptide family, in mammals

Adrenomedullin 5 (AM5) is a new member of the calcitonin gene-related peptide (CGRP) family identified in teleost fish. Although its presence was suggested in the genome database of mammals, molecular identity and biological function of AM5 have not been examined yet. In this study, we cloned a cDNA encoding AM5 in the pig and examined its cardiovascular and renal effects. Putative mature AM5 was localized in the middle of prohormone and had potential signals for intermolecular ring formation and C-terminal amidation. The AM5 gene was expressed most abundantly in the spleen and thymus. Several AM5 genes were newly identified in the database of mammals, which revealed that the AM5 gene exists in primates, carnivores, and undulates but could not be identified in rodents. In primates, nucleotide deletion occurred in the mature AM5 sequence in anthropoids (human and chimp) during transition from the rhesus monkey. Synthetic mature AM5 injected intravenously into rats induced dose-dependent decreases in arterial pressure at 0.1-1 nmol/kg without apparent changes in heart rate. The decrease was maximal in 1 min and AM5 was approximately half as potent as AM. AM5 did not cause significant changes in urine flow and urine Na+ concentration at any dose. In contrast to the peripheral vasodepressor action, AM5 injected into the cerebral ventricle dose-dependently increased arterial pressure and heart rate at 0.1-1 nmol. The increase reached maximum more quickly after AM5 (5 min) than AM (15-20 min). AM5 added to the culture cells expressing calcitonin receptor-like receptor (CLR) or calcitonin receptor (CTR) together with one of the receptor activity-modifying proteins (RAMPs), the combination of which forms major receptors for the CGRP family, did not induce appreciable increases in cAMP production in any combination, although AM increased it at 10(-)(10)-10(-)(9) M when added to the CLR and RAMP2/3 combination. These data indicate that AM5 seems to act on as yet unknown receptor(s) for AM5, other than CLR/CTR+RAMP, to exert central and peripheral cardiovascular actions in mammals.

Takei et al. J Endocrinol. 2008 May;197(2):391-400.

Peptide Receptor
AM1/ AM4 CLR-RAMP2/3
AM2 / AM3 CLR-RAMP3
AM5 specific AM5 Receptor?
CGRP CLR-RAMP1
Amylin CTR-RAMP2

Human Placentra Tissue by Anti-Adrenomedullin-5 (Porcine) Antiserum (H-010-40)

Tissue Sample

Human placenta tissues

Fixative

10% formalin

Embedding

Paraffin

Negative Control

No primary antibody

Pretreatment

N/A

Blocking

3% H2O2, 2% Normal Goat Serum

Primary Antibody

Rabbit anti-Adrenomedullin-5 (Porce) Antiserum (Cat. No.: H-010-40)

Optimal Dilution

1:500

Secondary Antibody

Goat Anti-Rabbit IgG, Biotinylated (1:400), 30 min

Amplification

Streptavidin-HRP (Vector), 1:400, 30 min

Detection System

HRP

Substrate

DAB (Sigma), 3 min

Counterstained

Hematoxylin, 30 sec

Amino acid sequence of Pig Adrenomedullin 5

Sequence Comparison between Human Hypothetical protein LCO199800 and Pig Adrenomedullin 5

Sequence Comparison between Human/Porcine ADM, human IMD, Eel AM3, Porcine AM5& human AM5

Yin Yang Theory of Adrenomedullin

For every force there is an opposing force that balances the overall effect. Such is the basic tenant of Yin and Yang. Adrenomedullin (ADM) eloquently fits this ancient wisdom. Hypotensive effects are elicited by fragments of ADM retaining the C-terminal with ring structure. Hypertensive effects are seen with N-terminal ADM fragments containing the ring structure, or with the ring structure alone. The hypotensive effects can be antagonized with C-terminal fragments lacking the ring structure. Nature has endowed ADM with the ability to regulate itself, however it remains to be seen if the Yin and Yang of ADM is utilized in vivo.

%adrenomedullin%


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