In the past, our learning about the disease of Polycystic Kidney Disease is 
usually from the histology. Now we need to refresh your learning about 
Polycystic Kidney Disease.
Through electron microscope and light microscope, we discover the kidney is 
constituted by only two parts, one part is renal inherent cells and the other is 
inherent extracellular matrix, and we have discovered that renal inherent cells 
can be divided into five categories, therefore we call them five categories of 
inherent cells. At the same time, we have discovered that all cells possess 
extracellular matrix and have different shapes except the inherent cells.
Therefore, we think, in fact, it is the two different substances that 
construct the special structure of kidney in different means. And a series of 
clinical symptoms caused by abnormal change of kidney function are the results 
of changes of normal condition of the two types of substance. And by analyzing 
this judging process, we have discovered that this process indeed is a judgment 
of the change of kidney function on the basis of cells. And then, on the basis 
of cells, we have discovered some regulars of change:
The damage process of kidney function is just the process of necrosis and 
decrease of renal inherent cells, the process of the development caused by 
hyperplasis of extracellular matrix, and the process of the whole kidney turn 
into the accretion of extracellular matrix.
As for the disease of Polycystic Kidney Disease, the mechanism is the 
abnormal hyperplasia of kidney tubules epithelial cells is its outstanding 
feature. When the kidney tubules epithelial cells turn into cysts epithelial 
cells, they begin to have the function of secretion. The liquid they secreted 
become more and more but there is no normal approach to eliminate. So with the 
increase of age and the accumulation of liquid, the cysts will gradually enlarge 
and the cysts pressure will increase, then the cysts will press the surrounding 
renal tissues and the tension of cysts wall will increase.
Now we can know the causes and the process of the enlargement of the cysts. 
Then on the basis of this, we can adopt more effective therapy to treat 
Polycystic Kidney Disease.
What is the effective therapy? The effective therapy should aim at 
controlling the secretion of cysts fluid and the "the abnormal hyperplasia of 
kidney tubules epithelial cells", thus achieve the goal of contracting the 
cysts, controlling the enlargement of cysts and preventing the damage to renal 
function