Development of medial pterygoid muscle fibers in rabbits fed with a liquid diet. (August 2017)

• Record Type: Journal Article
• Authors: Kuroki, Kozue; Morita, Takumi; Takasu, Hiroki; Saito, Keisuke; Fujiwara, Takuya; Hiraba, Katsunari; Goto, Shigemi
• Is Part Of: Archives of oral biology. Volume 80(2017)
• Page Start: 82
• Page End: 88
• Publication Date: 2017-08
• Subjects: Medial pterygoid muscle -- Postnatal development -- Muscle fiber type -- Liquid diet -- Rabbits; Mouth -- Periodicals; Mouth -- Diseases -- Periodicals; Dentistry -- Periodicals; Electronic journals; 617.6005
• DOI: 10.1016/j.archoralbio.2017.03.022
• Languages: English
• ISSNs: 0003-9969

Abstract

Highlights: We investigated the influence of liquid-diet raising on the medial pterygoid muscle. Medial pterygoid muscles were histochemically examined by MATPase staining. Liquid-diet consumption caused muscle fiber atrophy. Liquid-diet consumption caused an increase in the number of fast fibers. Effect of liquid-diet consumption appeared during early developmental stages after weaning. Abstract: Objective: This study aimed to investigate the influence of decreased functional load on the medial pterygoid muscle during mastication in rabbits fed with a liquid-diet. Materials and Methods: Medial pterygoid muscles from 54 rabbits (solid- and liquid-diet groups, n = 48; unweaned group, n = 6) were histochemically examined at 4, 9, 12, 18, and 33 weeks after birth. Six fiber types (I, IC, IIC, IIA, IIAB, and IIB) were distinguished via mATPase staining. Results: Significant increases in the diameters of all fiber types were seen up to 33 weeks of age in the solid-diet group; however, no significant increase was noted in fiber types I and IC, from 4 to 33 weeks of age, in the liquid-diet group. The proportion of slow fibers increased up to 12 weeks followed by an increase in the number of fast fibers in the solid-diet group, whereas in the liquid-diet group, the number of slow fiber declined after weaning. Conclusions: Liquid-diet consumption caused muscle fiber atrophy and an increase in the number of fast fibers during early developmental stages after weaning. Furthermore, the growth pattern of the medial pterygoid muscle in the liquid-diet group was different from that in the solid-diet group.