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Pigmentation

Pigmentation

The color of the skin is influenced by a number of pigments, including melanin, carotene, and hemoglobin. Recall that melanin is produced by cells called melanocytes, which are found scattered throughout the stratum basale of the epidermis. The melanin is transferred to the keratinocytes via melanosomes.
Melanin occurs in two primary forms: eumelanin that provides black and brown pigment and pheomelanin that provides red color. Dark-skinned individuals produce more melanin than those with pale...

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Quantitative Analysis of Planarian Pigmentation.

Matthew Pittendreigh¹, Kaleigh Powers², Meenalosini Vimal Cruz^1,3

¹Department of Computer Science, Keene State College, Keene, NH, USA.

Methods in Molecular Biology (Clifton, N.J.)

|July 10, 2023

Summary

Freshwater planarians use specialized cells for brown pigment production. A new imaging tool quantifies pigment changes, aiding research into pigment cell development and light sensitivity.

Keywords:

Ommochrome Pigment Platyhelminthes Porphyrin

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Area of Science:

Developmental Biology
Cell Biology
Biochemistry

Background:

Freshwater planarians possess brown coloration due to ommochrome and porphyrin pigments.
These pigments are synthesized by specialized dendritic cells situated beneath the epidermis.
Pigmentation is dynamic, influenced by embryonic development, regeneration, and light exposure.

Purpose of the Study:

To develop and apply a novel image-processing program for quantifying pigment levels in live planarians.
To analyze the effects of light exposure on planarian pigmentation.
To provide a tool for further investigation of pigment cell biology and photosensitivity.

Main Methods:

Development of image-processing algorithms to quantify relative pigment levels.
Application of the developed program to assess changes in bodily pigmentation.
Analysis of pigment cell ablation induced by prolonged light exposure.

Main Results:

A novel tool was created to quantify pigment levels in live planarians.
The tool enabled analysis of light-induced changes in pigmentation.
The study observed light-induced ablation of pigment cells via a porphyrin-based mechanism.

Conclusions:

The developed image-processing tool is effective for studying planarian pigmentation.
This research facilitates the characterization of genetic pathways controlling pigment cell differentiation and biosynthesis.
The findings contribute to understanding porphyrin-based photosensitivity mechanisms relevant to both planarians and human porphyrias.