Expression of the Na+-HCO3−cotransporter and its role in pHiregulation in guinea pig salivary glands

2006 ◽  
Vol 291 (6) ◽  
pp. G1031-G1040 ◽  
Author(s):  
Jingchao Li ◽  
Na-Youn Koo ◽  
Ik-Hyun Cho ◽  
Tae-Hwan Kwon ◽  
Se-Young Choi ◽  
...  
Keyword(s):  
Guinea Pig ◽  
Parotid Gland ◽  
Salivary Glands ◽  
Submandibular Gland ◽  
Experimental Model ◽  
Basolateral Membrane ◽  
Acinar Cells ◽  
Underlying Mechanism ◽  
Rt Pcr ◽  
Luminal Membrane

Patterns of salivary HCO3−secretion vary and depend on species and gland types. However, the identities of the transporters involved in HCO3−transport and the underlying mechanism of intracellular pH (pHi) regulation in salivary glands still remain unclear. In this study, we examined the expression of the Na+-HCO3−cotransporter (NBC) and its role in pHiregulation in guinea pig salivary glands, which can serve as an experimental model to study HCO3−transport in human salivary glands. RT-PCR, immunohistochemistry, and pHimeasurements from BCECF-AM-loaded cells were performed. The amiloride-sensitive Na+/H+exchanger (NHE) played a putative role in pHiregulation in salivary acinar cells and also appeared to be involved in regulation in salivary ducts. In addition to NHE, NBC also played a role in pHiregulation in both acini and ducts. In the parotid gland, NBC1 was functionally expressed in the basolateral membrane (BLM) of acinar cells and the luminal membrane (LM) of ducts. In the submandibular gland, NBC1 was expressed only in the BLM of ducts. NBC1 expressed in these two types of salivary glands takes up HCO3−and is involved in pHiregulation. Although NBC3 immunoreactivity was also detected in submandibular gland acinar cells and in the ducts of both glands, it is unlikely that NBC3 plays any role in pHiregulation. We conclude that NBC1 is functionally expressed and plays a role in pHiregulation in guinea pig salivary glands but that its localization and role are different depending on the type of salivary glands.

scholarly journals Differential expression of proline-rich proteins in rabbit salivary glands.

1992 ◽  
Vol 40 (9) ◽  
pp. 1393-1404 ◽  
Author(s):  
F D Ferreira ◽  
R Robinson ◽  
A R Hand ◽  
A Bennick
Keyword(s):  
Parotid Gland ◽  
Salivary Glands ◽  
Submandibular Gland ◽  
Secretory Granules ◽  
Acinar Cells ◽  
Ultrastructural Localization ◽  
Northern Blotting ◽  
In Vitro Translation ◽  
Specific Expression

Salivary glands synthesize and secrete an unusual family of proline-rich proteins (PRPs) that can be broadly divided into acidic and basic PRPs. We studied the tissue-specific expression of these proteins in rabbits, using antibodies to rabbit acidic and basic PRPs as well as antibodies and cDNA probes to human PRPs. By immunoblotting, in vitro translation, and Northern blotting, basic PRPs could be readily detected in the parotid gland but were absent in other salivary glands. In contrast, synthesis in vitro of acidic PRPs was detected in parotid, sublingual, and submandibular glands. Ultrastructural localization with immunogold showed heavy labeling with antibodies to acidic PRPs of secretory granules of parotid acinar cells and sublingual serous demilune cells. Less intense labeling occurred in the seromucous acinar cells of the submandibular gland. With antibodies to basic PRPs, the labeling of the parotid gland was similar to that observed with antibodies to acidic PRPs, but there was only weak labeling of granules of a few sublingual demilune cells, and no labeling of the submandibular gland. These results demonstrate a variable pattern of distribution of acidic and basic PRPs in rabbit salivary glands. These animals are therefore well suited for study of differential tissue expression of PRPs.

scholarly journals Autoradiographic localization of dihydrotestosterone binding in the major salivary glands and other androgen-responsive organs of the mouse.

1987 ◽  
Vol 35 (10) ◽  
pp. 1053-1058 ◽  
Author(s):  
J I Morrell ◽  
E W Gresik ◽  
T Barka
Keyword(s):  
Growth Factor ◽  
Salivary Glands ◽  
Submandibular Gland ◽  
Cellular Localization ◽  
Incidental Finding ◽  
Acinar Cells ◽  
Unexpected Finding ◽  
Cervical Lymph Nodes ◽  
Major Salivary Glands ◽  
Duct Cells

Mouse submandibular glands show an androgen-dependent sexual dimorphism, reflected in higher concentrations in males than in females of bioactive peptides, such as epidermal growth factor (EGF), nerve growth factor, and renin in the cells of the granular convoluted tubules (GCT). Biochemical studies have demonstrated androgen receptors in submandibular gland and other androgen-responsive organs in mouse. We have determined the cellular localization of these receptors using steroid autoradiography. Fifteen adult gonadectomized male mice were injected intravenously with 0.13 microgram or 0.26 microgram [3H]-dihydrotestosterone (SA 135 Ci/mM); some animals were pre-treated with cyclocytidine to stimulate secretion by GCT cells. Animals were killed 15 min, 1, 2, or 3 hr after isotope injection. Steroid autoradiographs were prepared, and some were stained immunocytochemically for EGF. Of the different cell types of submandibular gland, the acinar cells most frequently and intensely concentrated [3H]-DHT; GCT cells also concentrated the hormone, as did a small number of striated duct cells. In the other major salivary glands, the only cells that concentrated the androgen were interlobular striated duct cells in sublingual gland. In prostate, anterior pituitary, and brain a large number of cells concentrated androgen, as has been previously reported. Androgen binding by the GCT cells was a predictable finding, since androgen-induced alterations in composition and form of these cells are well documented. The intense androgen concentration by the acinar cells was an unexpected finding and suggests a hitherto unknown androgen regulation of these cells. An incidental finding was intense concentration of [3H]-DHT in the nuclei of the endothelial cells of the post-capillary venules of the cervical lymph nodes.

Regulation of electrolyte and fluid secretion in salivary acinar cells

1992 ◽  
Vol 263 (6) ◽  
pp. G823-G837 ◽  
Author(s):  
B. Nauntofte
Keyword(s):  
Ionic Composition ◽  
Basolateral Membrane ◽  
Acinar Cells ◽  
Fluid Secretion ◽  
Receptor Activation ◽  
Exchange Mechanism ◽  
Luminal Membrane ◽  
Net Uptake ◽  
Cl Channels ◽  
Simultaneous Activation

The primary secretion from exocrine gland cells is a fluid rich in Na+ and Cl- with a plasmalike ionic composition. Activation of specific receptors on the plasma membrane by hormones and neurotransmitters, which leads to activation of the phosphoinositol metabolism, results in release of Ca2+ from internal Ca2+ stores. Intracellular free Ca2+ concentration ([Ca2+]i) then rises simultaneously at both the basolateral and luminal parts of the acinar cell, reaching maximum values within 1 s after stimulation. In parotid acinar cells, increased [Ca2+]i activates the opening of maxi K+ channels located on the basolateral membrane and Cl- channels presumably located on the luminal membrane, resulting in rapid loss of K+ and Cl- and water and cell shrinkage. Extracellular electroneutrality is maintained by a paracellular Na+ flux into the lumen. Because of the simultaneous activation of K+ and Cl- channels, secretion occurs at a virtually constant membrane potential of about -60 mV. After maximal muscarinic cholinergic stimulation, loss of K+, Cl-, and water results in an approximate 25% reduction in cell volume within 10-15 s after receptor activation. Concomitant with loss of Cl-, there is a loss of HCO3- from the cell, causing a decrease in intracellular pH of 0.1 pH units because of the carbonic anhydrase-mediated conversion of CO2 into H+ and HCO3-. H+ generated from the metabolism and HCO3- production is compensated for by extrusion of H+ by a Na(+)-H+ exchange mechanism, which is responsible for approximately 75% of net Na+ gain that occurs after stimulation. Increased [Na+]i activates the Na(+)-K+ pump, which in turn extrudes Na+ from the cells. In both the unstimulated and stimulated states, cellular production of HCO3- can drive a net uptake of Cl- via the Cl(-)-HCO3- exchange mechanism operating in parallel with the Na(+)-H+ exchanger. The operation of the Cl(-)-HCO3- exchanger is, together with a Na(+)-K(+)-2Cl- cotransport system, essential for maintainance of a high [Cl-]i both in the unstimulated state and during Cl- reuptake.

Two malignant salivary gland tumours of different type in one patient

1994 ◽  
Vol 108 (9) ◽  
pp. 798-800 ◽  
Author(s):  
A. Hosni ◽  
C. Fisher ◽  
P. Rhŷ-Evans
Keyword(s):  
Salivary Gland ◽  
Parotid Gland ◽  
Adenoid Cystic Carcinoma ◽  
Salivary Glands ◽  
Submandibular Gland ◽  
Histological Type ◽  
Salivary Gland Tumours ◽  
Adenoid Cystic ◽  
The Right ◽  
Left Parotid Gland

AbstractThe synchronous or metachronous occurrence of two tumours of the salivary glands in one patient is rare. These are mainly benign and of the same histological type. Here we report a 56-year-old man who developed a mucoepidermoid tumour of the left parotid gland four years after diagnosis of adenoid cystic carcinoma of the right submandibular gland. This combination of neoplasms has not to our knowledge been reported before.

scholarly journals Myeloid Sarcoma That Infiltrated a Preexisting Sebaceous Lymphadenoma in the Parotid Gland: Diagnostic Challenges and Literature Review

2019 ◽  
Vol 2019 ◽  
pp. 1-11
Author(s):  
Sunmi Jo ◽  
Hye-kyung Shim ◽  
Joo Yeon Kim ◽  
Sang Kyun Bae ◽  
Mi Ra Kim
Keyword(s):  
Salivary Gland ◽  
Literature Review ◽  
Parotid Gland ◽  
Salivary Glands ◽  
Submandibular Gland ◽  
Diagnostic Methods ◽  
Myeloid Sarcoma ◽  
Histopathologic Evaluation ◽  
High Index Of Suspicion ◽  
Sebaceous Lymphadenoma

Myeloid sarcoma (MS) is a rarely encountered extramedullary localized tumor that is composed of immature myeloid cells. We reported an extremely rare case of MS with concurrent bone marrow (BM) involvement that invaded into a preexisting sebaceous lymphadenoma in the parotid gland and neck lymph nodes. Prompted by this case, we also present a literature review of MS invasion into salivary glands. A 62-year-old man was initially diagnosed with carcinoma that arose in a sebaceous lymphadenoma in the parotid gland, through a total parotidectomy with neck dissection. After an extensive histopathological review that included immunohistochemistry, a pathologic diagnosis of MS with infiltration into the sebaceous lymphadenoma with concurrent BM involvement was confirmed. MS is difficult to diagnose accurately; herein, we analyzed the clinical presentations and effectiveness of the various diagnostic methods with a review of the literature. There are 17 cases, including our case, reported in 13 studies. Of the cases in which the salivary glands were affected, 10 involved the parotid gland, six involved the submandibular gland, and one involved both. Isolated invasion of the salivary gland was found in one case of parotid gland invasion and three cases of submandibular gland invasion. In 13 cases, the salivary glands were affected by various other lesions. Although there were no incidences of isolated MS, six patients were diagnosed with secondary MS and eight patients with MS with BM involvement, including this case. The diagnosis of MS is difficult given its rarity, and a high index of suspicion and integrated radiologic and careful histopathologic evaluation are required. Most cases of MS infiltrating the salivary gland might be indicated by the possibility of BM involvement. MS with BM involvement predicts poor prognosis and the need for intensive systemic treatment.

scholarly journals TRPV4 activation in mouse submandibular gland modulates Ca2+ influx and salivation

2012 ◽  
Vol 303 (12) ◽  
pp. G1365-G1372 ◽  
Author(s):  
Yan Zhang ◽  
Marcelo A. Catalán ◽  
James E. Melvin
Keyword(s):  
Submandibular Gland ◽  
Transient Receptor Potential ◽  
Basolateral Membrane ◽  
Acinar Cells ◽  
Receptor Potential ◽  
Transient Receptor Potential Vanilloid ◽  
Secretion Pathway ◽  
Acid Metabolites ◽  
Transient Receptor ◽  
And Function

Transient receptor potential vanilloid subtype 4 (TRPV4) is a ligand-gated nonselective cation channel that participates in the transduction of mechanical and osmotic stimuli in different tissues. TRPV4 is activated by endogenous arachidonic acid metabolites, 4α-phorbol-12,13 didecanoate, GSK1016790A, moderate heat, and mechanical stress. TRPV4 is expressed in the salivary glands, but its expression pattern and function are poorly understood. The aim of this study was to evaluate the functional role of TRPV4 channels in the mouse submandibular gland. Using RT-PCR and Western blot analysis, we detected expression of TRPV4 message and protein, respectively, in the submandibular gland. Immunolocalization studies showed that TRPV4 targeted to the basolateral membrane of mouse submandibular gland acinar cells. Pharmacological TRPV4 activation using the selective agonist GSK1016790A caused Ca2+ influx in isolated acinar cells in a basal-to-apical wave. Consistent with these observations, GSK1016790A elicited salivation in the perfused submandibular gland that was dependent on extracellular Ca2+. In summary, we report that activation of TRPV4 channels induced Ca2+ influx and salivation and, thus, may contribute a novel nonadrenergic, noncholinergic secretion pathway in the mouse submandibular gland.

Primary Squamous Cell Carcinomas of Major Salivary Glands

1983 ◽  
Vol 92 (1) ◽  
pp. 97-98 ◽  
Author(s):  
John G. Batsakis
Keyword(s):  
Parotid Gland ◽  
Salivary Glands ◽  
Submandibular Gland ◽  
Squamous Cell ◽  
Squamous Cell Carcinomas ◽  
Major Salivary Glands ◽  
Submandibular Salivary Glands ◽  
True Frequency

Primary squamous cell carcinomas of the major (parotid and submandibular) salivary glands are uncommon neoplasms. Statistics contrary to that statement are tainted by the inclusion of mucoepidermoid carcinomas and, in the instance of the parotid gland, by metastatic carcinomas. The true frequency is less than 1% of all tumors in the parotid gland and approximately 4% for the submandibular gland.

scholarly journals МАКРОАНАТОМІЯ ТА АНГІОАРХІТЕКТОНІКА ВЕЛИКИХ СЛИННИХ ЗАЛОЗ БІЛОГО ЩУРА

2019 ◽  
Vol 1 (11(41)) ◽  
pp. 23-25
Author(s):  
Михалевич М. М. ◽  
Блищак Н. Б. ◽  
Борис Р. Я.
Keyword(s):  
Parotid Gland ◽  
Salivary Glands ◽  
Submandibular Gland ◽  
Venous Blood ◽  
Temporal Artery ◽  
Structural Features ◽  
Facial Artery ◽  
Horizontal Position ◽  
Cervical Area ◽  
Functional Purpose

Macroanatomy, topography of a large salivary glands of rats, the size and the functional mechanism are defined by the structural features of the skull and the cervical area, by the horizontal position of the rat’s body and by the features of functional purpose of the salivary glands. The morphological methods of research the large salivary glands of rats, proved that submandibular gland is located together with the large and small sublingual glands in the anterior region of the neck, the parotid gland is localized in the lateral region of the neck. The submandibular gland, the large and small sublingual glands are supplied by the facial artery, when the parotid gland is supplied by the temporal artery. A venous blood from the submandibular gland, the large and small sublingual glands is drained by sublingual vein and from the parotid gland- by the mandibular vein.

scholarly journals SGLT1 protein expression in plasma membrane of acinar cells correlates with the sympathetic outflow to salivary glands in diabetic and hypertensive rats

2010 ◽  
Vol 299 (6) ◽  
pp. E1028-E1037 ◽  
Author(s):  
Robinson Sabino-Silva ◽  
Ana B. T. Alves-Wagner ◽  
Katia Burgi ◽  
Maristela M. Okamoto ◽  
Adilson S. Alves ◽  
...  
Keyword(s):  
Plasma Membrane ◽  
Salivary Glands ◽  
Sympathetic Activity ◽  
Basolateral Membrane ◽  
Acinar Cells ◽  
Immunohistochemical Analysis ◽  
Spontaneously Hypertensive ◽  
Sodium Glucose Cotransporter ◽  
Wistar Kyoto ◽  
Induced Changes

Salivary gland dysfunction is a feature in diabetes and hypertension. We hypothesized that sodium-glucose cotransporter 1 (SGLT1) participates in salivary dysfunctions through a sympathetic- and protein kinase A (PKA)-mediated pathway. In Wistar-Kyoto (WKY), diabetic WKY (WKY-D), spontaneously hypertensive (SHR), and diabetic SHR (SHR-D) rats, PKA/SGLT1 proteins were analyzed in parotid and submandibular glands, and the sympathetic nerve activity (SNA) to the glands was monitored. Basal SNA was threefold higher in SHR ( P < 0.001 vs. WKY), and diabetes decreased this activity (∼50%, P < 0.05) in both WKY and SHR. The catalytic subunit of PKA and the plasma membrane SGLT1 content in acinar cells were regulated in parallel to the SNA. Electrical stimulation of the sympathetic branch to salivary glands increased (∼30%, P < 0.05) PKA and SGLT1 expression. Immunohistochemical analysis confirmed the observed regulations of SGLT1, revealing its location in basolateral membrane of acinar cells. Taken together, our results show highly coordinated regulation of sympathetic activity upon PKA activity and plasma membrane SGLT1 content in salivary glands. Furthermore, the present findings show that diabetic- and/or hypertensive-induced changes in the sympathetic activity correlate with changes in SGLT1 expression in basolateral membrane of acinar cells, which can participate in the salivary glands dysfunctions reported by patients with these pathologies.

scholarly journals Differential filipin labeling of the luminal membranes lining the pancreatic acinus.

1983 ◽  
Vol 31 (7) ◽  
pp. 952-955 ◽  
Author(s):  
L Orci ◽  
A Perrelet ◽  
R Montesano
Keyword(s):  
Acinar Cell ◽  
Exocrine Pancreas ◽  
Plasma Membranes ◽  
Basolateral Membrane ◽  
Acinar Cells ◽  
Pancreatic Acinus ◽  
Luminal Membrane

The cytochemical labeling of cholesterol by filipin in plasma membranes of the exocrine pancreas has shown a difference in the reactivity to filipin between the acinar and centro-acinar cells. The acinar cell has a poorly labeled luminal membrane but numerous filipin-cholesterol complexes on the basolateral membrane. In contrast, the centro-acinar cell shows a comparable degree of filipin labeling on both luminal and basolateral membrane. This difference in the distribution of filipin labeling suggests underlying differences in the organization of the respective membranes, probably related to their specific functions.

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