Early in the semester, we briefly talked about fingertip regeneration in genetics. This was a process completely unknown to me before. This drove my curiosity about what healing mechanism our fingertips have that the rest of our body lacks.
Fingertip regeneration has 4 main phases:
Inflammation, Histolysis, Blastema, and Differentiation.
Inflammation is the response to the digit tip amputation; a scab forms, bringing forth macrophages and neutrophils to distinct regions of the digit tip.
Without macrophages being brought to the site of the amputation, the phase of histolysis does not begin. The histolysis phase presents enzymatic degradation resulting in the loss of organized tissues. Osteoclasts recruit to the site, resulting in a secondary amputation.
Once the histolytic phase ends, the blastema phase begins. The blastema phase is an aggregation of undifferentiated cells that form between the proximal bone and stump. Paracrine signaling from surrounding tissue aids in influencing blastema proliferation. Lastly, the differentiation phase initiates regeneration from the proximal bone towards the distal end, building on the stump.
What’s interesting about the process is that if any of these phases are altered or inhibited, it completely prevents regeneration of the finger tip from occurring.
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