10
$\begingroup$

The affix -blast means an immature cell, and -cyte indicates any cell. So how do we define if a cell is mature (-cyte) or immature (-blast)? How does this apply to odontoblasts and ameloblasts? Why are they not simply called odontocytes and amelocytes, respectively?

What are the criteria for using the affix -cyte versus -blast?

$\endgroup$
  • 4
    $\begingroup$ Because they have different meanings? Wikipedia says, -cyte means "vessel, jar" while -blast means "germ, sprout". Those are quite different things. The -blasts usually have some function in being precursors or "generators" of something else, while the -cytes are often the result of such precursors. $\endgroup$ – skymningen Aug 18 '16 at 11:47
  • $\begingroup$ @skymningen. So odontoblasts are precursor for which cells? $\endgroup$ – JM97 Aug 18 '16 at 12:46
  • 2
    $\begingroup$ @JM97 Odontocytes: amigo.geneontology.org/amigo/term/CL:0000140 $\endgroup$ – kmm Aug 18 '16 at 13:29
  • 1
    $\begingroup$ I'm actually not convinced odontocytes even formally exist. I think this is a great question! +1 $\endgroup$ – AliceD Mar 10 '17 at 20:52
7
$\begingroup$

Short answer
- The affix -cyte means cell;
- The affix -blast means a germ (bud) cell or a cell that produces (building) materials.

Background
Cells are denoted as -cytes. There are many of them, e.g. melanocytes in the skin and chondrocytes in the cartillage.

Germ cells are denoted as -blasts. These cells typically are precursor cells such as the lymphoblasts that are undifferentiated precursor (stem) cells situated in the bone marrow that produce leukocytes.

Blast cells may also be cells that produce materials. Your examples are of that category; odontoblasts generate dentine, the main hard tissue of the tooth; ameloblasts deposit tooth enamel, which is the hard outermost layer of the tooth forming the surface of the crown. in that sense, also progenitor cells produce something, namely new cells. Hence, blast cells are cells with a chief building function, either materials or new cells.

There are also -clast cells - cells that destroy something. Fig. 1 below gives an overview of these cells as present in the bone, namely osteoblasts (bone builders that secrete the matrix), osteocytes (osteocytes are osteoblasts that are embedded in bone; they stop secreting matrix and only maintain it) and osteoclasts (different class of cells that mediate bone resorption).

cytes, blasts and clasts
Different cells in the bone. source: University of British Columbia

Why then do not call odontoblasts odontocytes? - Because it would mean loss of information. It would be the same as calling a car and a bike both transport vehicles. Moreover, the example in Fig.1 is quite convincing, as osteocytes and osteoblasts are considered to be different cells altogether (although the former is derived from the latter).

$\endgroup$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.