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Changes in Tracheal Respiratory Mucosa After Thyroidectomy: A Rat Model.

ABSTRACT: BACKGROUND/AIM:This study aimed to investigate changes in the tracheal mucosa after thyroidectomy, that can be a cause of post-thyroidectomy discomfort. MATERIALS AND METHODS:Forty rats were divided into normal controls and 3 surgical groups: (i) thyroid isthmectomy with cauterization, (ii) isthmectomy by a cold instrument without hemostasis, and (iii) sham (exposure of the trachea and thyroid gland without thyroidectomy by dissection through pretracheal fascia). Animals were euthanized at 1 and 4 weeks. Mucosal edema and glandular hyperplasia were measured. Mucin production and basal cell activities were evaluated by mucin 5AC (MUC5AC) and keratin 5 (KRT5) using immunofluorescence staining. RESULTS:Larger mucosal areas were observed in all surgical groups at 1 and 4 weeks. More submucosal glandular hyperplasia was noted in the group with isthmectomy without hemostasis. MUC5AC and KRT5 expressions were significantly higher in the surgical groups. CONCLUSION:The tracheal mucosa may change after surgery, which could explain postoperative discomfort after thyroidectomy.

SUBMITTER: Lim YS

PROVIDER: S-EPMC7279836 | biostudies-literature | 2020 May-Jun

REPOSITORIES: biostudies-literature

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Changes in Tracheal Respiratory Mucosa After Thyroidectomy: A Rat Model.

Lim Yun-Sung YS Choi Yong Jun YJ Kim Bo Hae BH Kim Hee-Bok HB Cho Chang Gun CG Park Seok-Won SW Park Joo Hyun JH

In vivo (Athens, Greece) 20200501 3

<h4>Background/aim</h4>This study aimed to investigate changes in the tracheal mucosa after thyroidectomy, that can be a cause of post-thyroidectomy discomfort.<h4>Materials and methods</h4>Forty rats were divided into normal controls and 3 surgical groups: (i) thyroid isthmectomy with cauterization, (ii) isthmectomy by a cold instrument without hemostasis, and (iii) sham (exposure of the trachea and thyroid gland without thyroidectomy by dissection through pretracheal fascia). Animals were euth ...[more]

PMID: 32354902

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Project description:Extracts of the bovine tracheal mucosa have an abundant peptide with potent antimicrobial activity. The 38-amino acid peptide, which we have named tracheal antimicrobial peptide (TAP), was isolated by a sequential use of size-exclusion, ion-exchange, and reverse-phase chromatographic fractionations using antimicrobial activity as a functional assay. The yield was approximately 2 micrograms/g of wet mucosa. The complete peptide sequence was determined by a combination of peptide and cDNA analysis. The amino acid sequence of TAP is H-Asn-Pro-Val-Ser-Cys-Val-Arg-Asn-Lys-Gly-Ile-Cys-Val-Pro-Ile-Arg-Cys-Pr o- Gly-Ser-Met-Lys-Gln-Ile-Gly-Thr-Cys-Val-Gly-Arg-Ala-Val-Lys-Cys-Cys-Arg- Lys-Lys - OH. Mass spectral analysis of the isolated peptide was consistent with this sequence and indicated the participation of six cysteine residues in the formation of intramolecular disulfide bonds. The size, basic charge, and presence of three intramolecular disulfide bonds is similar to, but clearly distinct from, the defensins, a well-characterized class of antimicrobial peptides from mammalian circulating phagocytic cells. The putative TAP precursor is predicted to be relatively small (64 amino acids), and the mature peptide resides at the extreme carboxyl terminus and is bracketed by a short putative propeptide region and an inframe stop codon. The mRNA encoding this peptide is more abundant in the respiratory mucosa than in whole lung tissue. The purified peptide had antibacterial activity in vitro against Escherichia coli, Staphylococcus aureus, Klebsiella pneumonia, and Pseudomonas aeruginosa. In addition, the peptide was active against Candida albicans, indicating a broad spectrum of activity. This peptide appears to be, based on structure and activity, a member of a group of cysteine-rich, cationic, antimicrobial peptides found in animals, insects, and plants. The isolation of TAP from the mammalian respiratory mucosa may provide insight into our understanding of host defense of this vital tissue.

Dataset Information

Changes in Tracheal Respiratory Mucosa After Thyroidectomy: A Rat Model.

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Changes in Tracheal Respiratory Mucosa After Thyroidectomy: A Rat Model.

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