Molecular Cloning of Developmentally Regulated Neonatal Rat Submandibular Gland Proteins

1993 ◽  
Vol 4 (3) ◽  
pp. 525-530 ◽  
Author(s):  
Lily Mirels ◽  
Lisa R. Girard ◽  
William D. Ball

At birth, the rat submandibular gland (SMG) contains two transient secretory cell types that produce several characteristic salivary proteins. Proteins SMG-A, B1, and B2 (23.5, 26 and 27.5 kDa) are products of the neonatal type III cells, but not the adult acinar cells. Protein C (89 kDa), a major product of the neonatal type I cells, is either absent or present at greatly diminished levels in the secretory cells of the adult gland. The decrease in biosynthesis of these neonatal salivary proteins occurs concomitantly with the increase in levels of characteristic adult SMG products. In order to understand these developmentally regulated changes in SMG salivary protein gene expression, we have initiated the molecular cloning and characterization of neonatal submandibular gland proteins from a 5-d-old rat submandibular gland cDNA library. Clones encoding SMG-A were isolated by homology to the mouse parotid secretory protein (PSP). SMG-A was shown to be derived from a salivary protein multigene family that also includes PSP. Cloning and characterization of additional neonatal rat submandibular gland proteins was initiated by screening the 5-d-old rat submandibular gland cDNA library with first strand cDNA prepared from 1-d-old rat submandibular glands. Clones corresponding to a highly abundant 3 kb transcript present in the neonatal rat SMG, but not in adult submandibular, sublingual, or parotid gland have been identified. The size, abundance, and organ specificity of this transcript suggest that it may encode protein C. One clone derived from an unknown transcript that is developmentally regulated in the neonatal SMG and is present in the adult parotid, submandibular, and sublingual glands was also identified.

1996 ◽  
Vol 13 (5) ◽  
pp. 709-716 ◽  
Author(s):  
Earl F. Albone ◽  
Fred K. Hagen ◽  
Claude Szpirer ◽  
Lawrence A. Tabak

Gene ◽  
2004 ◽  
Vol 334 ◽  
pp. 23-33 ◽  
Author(s):  
Karen M Zinzen ◽  
Arthur R Hand ◽  
Maya Yankova ◽  
William D Ball ◽  
Lily Mirels

Author(s):  
L.S. Cutler

Many studies previously have shown that the B-adrenergic agonist isoproterenol and the a-adrenergic agonist norepinephrine will stimulate secretion by the adult rat submandibular (SMG) and parotid glands. Recent data from several laboratories indicates that adrenergic agonists bind to specific receptors on the secretory cell surface and stimulate membrane associated adenylate cyclase activity which generates cyclic AMP. The production of cyclic AMP apparently initiates a cascade of events which culminates in exocytosis. During recent studies in our laboratory it was observed that the adenylate cyclase activity in plasma membrane fractions derived from the prenatal and early neonatal rat submandibular gland was retractile to stimulation by isoproterenol but was stimulated by norepinephrine. In addition, in vitro secretion studies indicated that these prenatal and neonatal glands would not secrete peroxidase in response to isoproterenol but would secrete in response to norepinephrine. In contrast to these in vitro observations, it has been shown that the injection of isoproterenol into the living newborn rat results in secretion of peroxidase by the SMG (1).


2013 ◽  
Vol 36 (17) ◽  
pp. 2848-2861 ◽  
Author(s):  
Tiziana Cabras ◽  
Federica Iavarone ◽  
Davide Pirolli ◽  
Maria Cristina De Rosa ◽  
Alberto Vitali ◽  
...  

1992 ◽  
Vol 40 (1) ◽  
pp. 83-92 ◽  
Author(s):  
T Berg ◽  
I Wassdal ◽  
K Sletten

The rat submandibular gland contains several members of the kallikrein family. In the present study we purified and raised an antiserum against one of these enzymes, i.e., esterase B, which was first described by Khullar et al. in 1986. N-terminal amino acid analysis revealed complete homology between esterase B and the kallikrein family gene RSKG-7. For characterization of the antiserum, flat-bed isoelectrofocusing with immunoblotting was superior to immunoelectrophoresis and double immunodiffusion in detecting and identifying crossreacting proteins. This was due to the fact that kallikrein-like enzymes were readily separated by isoelectrofocusing, and immunoreactivity was easily detected by the sensitive peroxidase-anti-peroxidase staining after blotting onto nitrocellulose membrane. Immunohistochemical controls were carried out accordingly, including homologous as well as crossreacting antigens. In the submandibular gland, esterase B was detected exclusively in all granular convoluted tubular cells, co-localized with tissue kallikrein and tonin. Some staining was also observed in striated duct cells; however, this staining reaction was induced by cross-reactivity with kallikrein, since staining was abolished by addition of kallikrein as well as esterase B to the primary antiserum. It was therefore concluded that like tonin and antigen gamma, but unlike kallikrein, esterase B was not detected in the striated ducts of the submandibular, parotid, or sublingual glands. This separation in anatomic distribution between esterase B and kallikrein may indicate that prokallikrein activation is not the only biological function of esterase B.


Sign in / Sign up

Export Citation Format

Share Document