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. 2016 Sep;20(3):207-217.
doi: 10.12717/DR.2016.20.3.207.

Digestive Physiological Characteristics of the Gobiidae: - Characteristics of CCK-producing Cells and Mucus-secreting Goblet Cells of Stomach Fish and Stomachless Fish

Sang-Woo Hur  1 , Shin-Kwon Kim  1 , Dae-Jung Kim  1 , Bae-Ik Lee  1 , Su-Jin Park  1 , Hyung-Gyu Hwang  1 , Je-Cheon Jun  1 , Jeong-In Myeong  1 , Chi-Hoon Lee  2 , Young-Don Lee  2
Affiliations

Digestive Physiological Characteristics of the Gobiidae: - Characteristics of CCK-producing Cells and Mucus-secreting Goblet Cells of Stomach Fish and Stomachless Fish

Sang-Woo Hur et al. Dev Reprod. 2016 Sep.

Abstract

In this study, we investigated the characteristics of CCK-producing cells and mucus-secreting goblet cells with respect to stomach fish and stomachless fish of the Gobiidae in order to provide a basis for understanding the digestive physiology. Hairychin goby (Sagamia geneionema), which is stomachless fish, the numbers of mucus-secreting goblet cells is highest in the posterior intestine portion (P<0.05), while CCK-producing cells are scattered throughout the intestine. Gluttonous goby (Chasmichthys gulosus), which is stomach fish, mucus-secreting goblet cells are most abundant in the mid intestine portion (P<0.05), whereas CCK-producing cells are observed only in the anterior and mid intestine portion. Trident goby (Tridentiger obscurus) which is stomach fish, mucus-secreting goblet cells were most abundant in the mid intestine portion (P<0.05). CCK-producing cells are found in the anterior and mid intestine portion. Giurine goby, Rhinogobius giurinus which is also stomach fish, the largest number of mucus-secreting goblet cells showed in anterior intestine portion except for esophagus (P<0.05). CCK-producing cells are present only in the anterior and mid intestine portion. In S. geneionema, digestive action occurs in the posterior intestine portion to protect and functions to activate digestion. In contrast, in C. gulosus, T. obscurus and R. giurinus, their digestive action occurs in the anterior and mid intestine portion to protect and functions to activate digestion. Further studies of the modes of food ingestion by these fish, the contents of their digestive tracts, and the staining characteristics of the goblet cells need to be carried out.

Keywords: CCK-producing cell; Gobiidae; Mucus-secreting goblet cells; Stomach fish; Stomachless fish.

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Figures

Fig. 1
Fig. 1. External morphology of the digestive tract of the Gobiidae.
A: S. geneionema, B: C. gulosus, C: T. obscurus, D: R. giurinus AN: anus, ES: esophagus, SP: spleen, ST: stomach, ap: anterior intestine portion, ep: esophagus portion, mp: mid intestine portion, pp: posterior intestine portion, rp: rectum portion, sp: stomach portion. Scale bars indicate 10 mm.
Fig. 2
Fig. 2. Photomicrographs of CCK-producing cells in the digestive tract of S. geneionema.
A: anterior intestine portion, B: mid intestine portion, C: posterior intestine portion, D: rectum, Cc: CCK-producing cell. Scale bars indicate 50 μm. Magnified goblet cells in (A-D) were shown in (A'-D'). Scale bars indicate 20 μm.
Fig. 3
Fig. 3. Photomicrographs of CCK-producing cells in the digestive tract of C. gulosus.
A: anterior intestine portion, B: mid intestine portion, Cc: CCK-producing cell. Scale bars indicate 50 μm. Magnified CCK-producing cells in (A-B) were shown in (A'- B'). Scale bars indicate 20 μm.
Fig. 4
Fig. 4. Photomicrographs of CCK-producing cells in the digestive tract of T. obscurus.
A: anterior intestine portion, B: mid intestine portion, Cc: CCKproducing cell. Scale bars indicate 50 μm. Magnified CCK-producing cells in (A-B) were shown in (A'- B'). Scale bars indicate 20 μm.
Fig. 5
Fig. 5. Photomicrographs of CCK-producing cells in the digestive tract of R. giurinus.
A: anterior intestine portion, B: mid intestine portion, Cc: CCK-producing cell. Scale bars indicate 50 μm. Magnified CCK-producing cells in (A-B) were shown (A'-B'). Scale bars indicate 20 μm.
Fig. 6
Fig. 6. Photomicrographs of goblet cells in the digestive tract of S. geneionema.
A: esophagus, B: anterior intestine portion, C: mid intestine portion, D: posterior intestine portion, E: rectum, Gc: goblet cell. Scale bars indicate 100 μm. Magnified goblet cells in (A-E) were shown in (A'-E'). Scale bars indicate 20 μm.
Fig. 7
Fig. 7. Photomicrographs of goblet cells in the digestive tract of C. gulosus.
A: esophagus, B: anterior intestine portion, C: mid intestine portion, D: posterior intestine portion, E: rectum, Gc: goblet cell. Scale bars indicate 100 μm. Magnified goblet cells in (A-E) were shown in (A'-E'). Scale bars indicate 20 μm.
Fig. 8
Fig. 8. Photomicrographs of goblet cells in the digestive tract of T. obscurus.
A: esophagus, B: anterior intestine portion, C: mid intestine portion, D: posterior intestine portion, E: rectum, Gc: goblet cell. Scale bars indicate 100 μm. Magnified goblet cells in (A-E) were shown in (A'-E'). Scale bars indicate 20 μm.
Fig. 9
Fig. 9. Photomicrographs of goblet cells in the digestive tract of R. giurinus.
A: esophagus, B: anterior intestine portion, C: mid intestine portion, D: posterior intestine portion, E: rectum, Gc: goblet cell. Scale bars indicate 100 μm. Magnified goblet cells in (A-E) were shown in (A'-E'). Scale bars indicate 20 μm.
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