What is osteoclastic bone resorption?

Bone resorption is resorption of bone tissue, that is, the process by which osteoclasts break down the tissue in bones and release the minerals, resulting in a transfer of calcium from bone tissue to the blood. The osteoclasts are multi-nucleated cells that contain numerous mitochondria and lysosomes.

How do osteoclasts facilitate bone resorption describe the specific process?

Bone resorption is performed by osteoclasts that release enzymes such as tartrate-resistant acid phosphatase (TRAP) and H+ degrading organic matrix components and acidifying extracellular medium that contributes to hydroxyapatite crystal dissolution.

Where do osteoclasts house themselves during bone resorption?

This process also helps regulate the level of blood calcium. Osteoclasts are found on those surfaces of bone which are undergoing resorption. On such surfaces, the osteoclasts are seen to be located in shallow depressions called resorption bays (Howship’s lacunae).

What stimulates osteoclasts to degrade bone?

Vitamin D and PTH can increase the recruitment and activity of osteoclasts, stimulating bone resorption and resulting in an increase in blood calcium levels.

Is bone resorption bad?

This is a natural process that’s important for your health and wellbeing. But when resorption happens at a higher rate than it can be replaced, it can lead to a decrease in your bone mass and put you at higher risk for fractures and breakage.

What are the steps of bone resorption?

The remodeling cycle consists of three consecutive phases: resorption, during which osteoclasts digest old bone; reversal, when mononuclear cells appear on the bone surface; and formation, when osteoblasts lay down new bone until the resorbed bone is completely replaced.

What is the process of bone resorption?

Bone resorption is the process by which the bones are absorbed and broken down by the body. Osteoclast cells are responsible for the breakdown of bone minerals thus releasing calcium and phosphorous into the bloodstream.

How are osteoblastic cells involved in bone resorption?

Many present resorption inhibitors inhibit osteoclast formation via osteoblastic cells since they are producing a number of factors that are essential for osteoclast differentiation. Best characterized of these factors are macrophage colony stimulating factor (M-CSF) and receptor activator of NFêB ligand (RANKL).

Why do we need to regulate bone resorption?

Pathophysiology of several skeletal diseases includes either increased (for instance osteoporosis, metastatic bone disease and Paget’s disease of bone) or decreased (various syndromes of osteopetrosis) bone resorption rate. Thus there is a genuine need to regulate, especially inhibit, bone resorption rate in several diseases.

How are osteoclasts used to study other pathological processes?

Thus osteoclasts may offer some clues to study also other pathological processes like tissue invasion mechanisms of malignant cells. Therapeutic inhibition of bone resorption can be reached in multiple ways. One can reduce the differentiation rate of osteoclasts and thus decrease the number of resorbing cells.

What causes bone resorption in postmenopausal skeletal disease?

On the contrary, many common skeletal diseases, like postmenopausal osteoporosis and metastatic bone disease, are characterized by increased bone resorption. This will reduce bone mass and also leads to disturbed internal microarchitecture causing increased bone fragility and fractures.