What is a Juxtaglomerular tumor?
Juxtaglomerular cell tumor (JGCT), also known as reninoma, is an extremely rare kidney tumor of the juxtaglomerular cells that typically secrete renin. It often causes severe hypertension that is difficult to control in young adults.
What is the Juxtaglomerular cell?
Juxtaglomerular cells (JG cells), also known as granular cells are cells in the kidney that synthesize, store, and secrete the enzyme renin. They are specialized smooth muscle cells mainly in the walls of the afferent arterioles (and some in the efferent arterioles) that deliver blood to the glomerulus.
What is a normal renin level?
For normal sodium diet, normal value range is 0.6 to 4.3 ng/mL/hour (0.6 to 4.3 µg/L/hour). For low sodium diet, normal value range is 2.9 to 24 ng/mL/hour (2.9 to 24 µg/L/hour). Normal value ranges may vary slightly among different laboratories.
What do juxtaglomerular cells detect?
These cells do two things: They monitor blood pressure, by measuring how much the arteriole wall is stretched. They monitor the concentration of sodium and chloride ions in the filtrate of the macula densa.
Where are the juxtaglomerular cells located in the kidney?
Location. The juxtaglomerular apparatus is part of the kidney nephron, next to the glomerulus. It is found between afferent arteriole and the distal convoluted tubule of the same nephron.
What is the significance of juxtaglomerular apparatus in kidney function?
The juxtaglomerular apparatus (JGA), consisting of the glomerular afferent and efferent arterioles and the specialized tubular epithelial cells called the macula densa, plays a central role in the regulation of glomerular hemodynamics and renin release.
Which aspect of kidney function is performed by the juxtaglomerular apparatus?
The juxtaglomerular apparatus is a specialized structure formed by the distal convoluted tubule and the glomerular afferent arteriole. It is located near the vascular pole of the glomerulus and its main function is to regulate blood pressure and the filtration rate of the glomerulus.
How can I lower my renin levels naturally?
Normally, eating too much salt suppresses the release of renin. Thus, in healthy, non-salt-sensitive people, reducing salt can raise renin levels [10]. Cutting back on salt is also beneficial for salt-sensitive people, whose blood pressure rises in response to salt intake [28].
What if renin is high?
High renin with normal aldosterone may show that you’re sensitive to salt. Low renin and high aldosterone may mean your adrenal glands aren’t working the way they should. If both are high, it can be a sign that there’s a problem with your kidneys.
What results if the kidney produces too much renin?
High renin levels could mean that you have: Addison’s disease (when your adrenal glands don’t make enough hormones) from volume depletion. Dehydration. Low potassium levels in your blood (hypokalemia).
What is the significance of JGA in kidney function?
How JGA regulates the kidney function?
(2) Cells of JGA can secrete renin upon activation. (3) Cells of JGA are activated by fall in glomerular blood pressure (GFR). (4) Renin converts angiotensinogen into angiotensin. These two substances togther form renin-angiotensin mechanism for regulating kidney functioning.
Which of the following is the primary function of the juxtaglomerular complex?
Which of the following is the primary function of the juxtaglomerular complex? releases chemical signals that regulate the rate of filtrate formation; The macula densa cells and granular cells of the juxtaglomerular complex (JGC) release, respectively, vasoactive chemicals and renin.
Where is the juxtaglomerular apparatus located?
glomerular hilum
Abstract. The juxtaglomerular apparatus, located in the glomerular hilum, consists of a vascular component (afferent and efferent arterioles and extraglomerular mesangium) and a tubular component (macula densa).
What does the juxtaglomerular apparatus detect?
It is located near the vascular pole of the glomerulus and its main function is to regulate blood pressure and the filtration rate of the glomerulus. The macula densa is a collection of specialized epithelial cells in the distal convoluted tubule that detect sodium concentration of the fluid in the tubule.
Can high renin be cured?
Renal hypertension (high renin/high aldosterone) is best treated with angiotensin receptor antagonists; primary aldosteronism (low renin/high aldosterone) is best treated with aldosterone antagonists (spironolactone or eplerenone); and hypertension due to overactivity of the renal epithelial sodium channel (low renin/ …
What does juxtaglomerular cancer look like?
Juxtaglomerular cell tumor is often well-circumscribed, yellow to gray-tan in color, with a complete or partial fibrous capsule usually observed. Histologically cytoplasm of tumor cells consisting of renin and solid sheets of closely packed round to polygonal cells 5. Imaging findings are variable.
Can Juxtaglomerular cell tumor cause high blood pressure?
Juxtaglomerular cell tumor. This tumor typically secretes renin, hence the former name of reninoma. It often causes severe hypertension that is difficult to control, in adults and children, although among causes of secondary hypertension it is rare. It develops most commonly in young adults, but can be diagnosed much later in life.
Is Juxtaglomerular cell tumor a rare kidney tumor?
Juxtaglomerular cell tumor is a rare kidney tumor. This study aimed to report the clinic features of juxtaglomerular cell tumor and our treatment experience. Methods: The medical records of 9 juxtaglomerular cell tumor patients treated in our hospital from 1997 to 2017 were retrospectively reviewed.
What is Juxtaglomerular cell tumor (JCT)?
Juxtaglomerular cell tumor (JCT, JGCT, also reninoma) is an extremely rare kidney tumour of the juxtaglomerular cells, with less than 100 cases reported in literature. This tumor typically secretes renin, hence the former name of reninoma.