𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Calcitonin-like immunoreactivity in serum and tissues of the bonnethead shark,Sphyrna tiburo

✍ Scribed by Nichols, Stephanie ;Gelsleichter, James ;Manire, Charles A. ;Cailliet, Gregor M.

Publisher
John Wiley and Sons
Year
2003
Tongue
English
Weight
323 KB
Volume
298A
Category
Article
ISSN
0022-104X

No coin nor oath required. For personal study only.

✦ Synopsis

Calcitonin is a 32-amino acid peptide hormone that is best known for its actions in maintaining skeletal integrity and calcium homeostasis in mammals. Calcitonin also appears to function in regulating certain aspects of animal reproduction, but the nature of this role remains unclear, particularly in nonmammalian vertebrates. The present study investigated the relationship between calcitonin and reproduction in the bonnethead shark (Sphyrna tiburo), a well-studied member of the oldest living vertebrate group (i.e. elasmobranchs) known to possess a calcitonin-producing organ. Serum calcitonin concentrations were measured in 28 reproductively mature female S. tiburo using a heterologous enzyme-linked immunosorbent assay (ELISA) system. Sites of calcitonin immunoreactivity were detected in tissues of mature female and embryonic S. tiburo using immunocytochemistry. Significant increases in serum calcitonin concentrations of mature female S. tiburo occurred during early stages of gestation, a period characterized by yolk-dependency of developing embryos. Immunoreactive calcitonin was detected in the duodenum and pancreas of embryonic S. tiburo sampled during the same period. The results from this study suggest that calcitonin obtained from endogenous and/or maternal sources may function in regulating yolk digestion in embryonic S. tiburo. Therefore, the association between calcitonin and reproduction in elasmobranchs may reflect an important role for this hormone in embryonic development.

πŸ“œ SIMILAR VOLUMES

Bite force and performance in the duroph
Bite force and performance in the durophagous bonnethead shark, Sphyrna tiburo
✍ Kyle R. Mara; Philip J. Motta; Daniel R. Huber πŸ“‚ Article πŸ“… 2009 πŸ› Wiley (John Wiley & Sons) 🌐 English βš– 287 KB

## Abstract Bite force, a measure of performance, can be used to link anatomical form and function. Earlier studies have shown bite force to have a significant influence on dietary constraints and ontogenetic shifts in resource utilization. The bonnethead shark, __Sphyrna tiburo__, is a durophagous

Structure and permeability of the egg ca
Structure and permeability of the egg capsule of the bonnethead shark,Sphyrna tiburo
✍ Heiden, Tisha C King ;Haines, Ashley Neal ;Manire, Charles ;Lombardi, Julian ;Ko πŸ“‚ Article πŸ“… 2005 πŸ› John Wiley and Sons 🌐 English βš– 399 KB

In the viviparous bonnethead shark, Sphyrna tiburo, a fluid-filled, acellular egg capsule surrounds fertilized eggs and developing embryos throughout gestation. Like other placental shark species, the capsule remains intact even at the placental implantation site. Although its intervention between t

Serum steroid hormones including 11-keto
Serum steroid hormones including 11-ketotestosterone, 11-ketoandrostenedione, and dihydroprogesterone in juvenile and adult bonnethead sharks,Sphyrna tiburo
✍ Manire, Charles A.; Rasmussen, L.E.L.; Gross, Timothy S. πŸ“‚ Article πŸ“… 1999 πŸ› John Wiley and Sons 🌐 English βš– 121 KB

Previous studies in the placental viviparous bonnethead shark, Sphyrna tiburo, have correlated 17 Ξ²-estradiol, progesterone, testosterone, and dihydrotestosterone with reproductive events in both males and females. However, several key reproductive events, including implantation, maintenance of preg

Calcitonin-like immunoreactivity in the
Calcitonin-like immunoreactivity in the blue crab: Tissue distribution, variations in the molt cycle, and partial characterization
✍ Cameron, James N. ;Thomas, Peter πŸ“‚ Article πŸ“… 1992 πŸ› John Wiley and Sons 🌐 English βš– 704 KB

## Abstract Calcitonin‐like immunoreactivity has been found in blood and tissues of the marine blue crab, __Callinectes sapidus__ Rathbun. The activity in blood rises significantly during the immediate premolt (D4) stage, but tissue immunoreactivity does not vary significantly with molt stage. The

Distribution of myomodulin-like and bucc
Distribution of myomodulin-like and buccalin-like immunoreactivities in the central nervous system and peripheral tissues of the mollusc,Clione limacina
✍ Norekian, T.P.; Satterlie, R.A. πŸ“‚ Article πŸ“… 1997 πŸ› John Wiley and Sons 🌐 English βš– 418 KB πŸ‘ 2 views

The distribution of the myomodulin-like and buccalin-like immunoreactivities in the central nervous system and peripheral tissues associated with feeding was examined in the pteropod mollusc Clione limacina by using wholemount immunohistochemical techniques. Immunoreactive neurons and cell clusters