The Association of Fasting C-peptide with Corneal Neuropathy in Patients with Type 2 Diabetes
Purpose. Damage to corneal nerve fibers has been demonstrated in people with type 2 diabetes mellitus (T2DM) that further progresses with increasing severity of diabetic peripheral neuropathy. However, the role of C-peptide in corneal nerve damage has not been reported in T2DM. The present study inv...
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | Journal of Diabetes Research |
| Online Access: | http://dx.doi.org/10.1155/2020/8883736 |
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| author | Anju Zuo Chuan Wang Lili Li Jingru Qu Juan Cao Li Chen Solomon Tesfaye Wenjuan Li Xinguo Hou |
| author_facet | Anju Zuo Chuan Wang Lili Li Jingru Qu Juan Cao Li Chen Solomon Tesfaye Wenjuan Li Xinguo Hou |
| author_sort | Anju Zuo |
| collection | DOAJ |
| description | Purpose. Damage to corneal nerve fibers has been demonstrated in people with type 2 diabetes mellitus (T2DM) that further progresses with increasing severity of diabetic peripheral neuropathy. However, the role of C-peptide in corneal nerve damage has not been reported in T2DM. The present study investigated the relationship of fasting C-peptide levels with corneal neuropathy evaluated by corneal confocal microscopy (CCM) in patients with T2DM. Methods. 160 T2DM patients (72 females) aged 34-78 with duration ranging from 0 to 40 years underwent CCM to measure corneal nerve fiber length (CNFL), corneal nerve fiber density (CNFD), and corneal nerve branch density (CNBD). Pearson correlation analysis and multiple linear regression analysis were used to explore the association of fasting C-peptide levels with corneal nerve parameters. Partial correlation analysis (adjusted for age and gender) was also conducted to analyze the correlation of metabolic indexes with these three corneal nerve parameters. The relationship between fasting C-peptide levels and duration of diabetes was also explored by Pearson correlation analysis. Results. With an increase in fasting C-peptide levels, the values of CNFL, CNFD, and CNBD also showed a corresponding trend for an increase. Partial correlation analysis revealed that fasting C-peptide levels were positively associated with CNFL (r=0.245, P=0.002), CNFD (r=0.180, P=0.024), and CNBD (r=0.214, P=0.008) after adjusting for age and gender. Using multiple linear regression analysis, fasting C-peptide levels were also closely associated with CNFL (P=0.047) and CNBD (P=0.038) after multiple adjustments. However, this association disappeared after further adjusting for duration of diabetes. Further analysis indicated that fasting C-peptide levels declined with duration of diabetes (r=−0.267, P=0.001). Conclusions. C-peptide was closely associated with corneal neuropathy and disease duration in T2DM. C-peptide levels might be both an indicator of beta-cell function and a marker of disease severity (such as diabetic corneal neuropathy) and duration. |
| format | Article |
| id | doaj-art-7883798b4fdf4bc5bbef57b87327d439 |
| institution | Kabale University |
| issn | 2314-6745 2314-6753 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Diabetes Research |
| spelling | doaj-art-7883798b4fdf4bc5bbef57b87327d4392025-02-03T06:05:42ZengWileyJournal of Diabetes Research2314-67452314-67532020-01-01202010.1155/2020/88837368883736The Association of Fasting C-peptide with Corneal Neuropathy in Patients with Type 2 DiabetesAnju Zuo0Chuan Wang1Lili Li2Jingru Qu3Juan Cao4Li Chen5Solomon Tesfaye6Wenjuan Li7Xinguo Hou8Department of Endocrinology, Qilu Hospital of Shandong University, Jinan, Shandong, 250012, ChinaDepartment of Endocrinology, Qilu Hospital of Shandong University, Jinan, Shandong, 250012, ChinaDepartment of Endocrinology, Qilu Hospital of Shandong University, Jinan, Shandong, 250012, ChinaDepartment of Endocrinology, Qilu Hospital of Shandong University, Jinan, Shandong, 250012, ChinaDepartment of Endocrinology, Qilu Hospital of Shandong University, Jinan, Shandong, 250012, ChinaDepartment of Endocrinology, Qilu Hospital of Shandong University, Jinan, Shandong, 250012, ChinaDiabetes Research Department, Sheffield Teaching Hospitals NHS Foundation Trust, Sheffield, UKDepartment of Endocrinology, Qilu Hospital of Shandong University, Jinan, Shandong, 250012, ChinaDepartment of Endocrinology, Qilu Hospital of Shandong University, Jinan, Shandong, 250012, ChinaPurpose. Damage to corneal nerve fibers has been demonstrated in people with type 2 diabetes mellitus (T2DM) that further progresses with increasing severity of diabetic peripheral neuropathy. However, the role of C-peptide in corneal nerve damage has not been reported in T2DM. The present study investigated the relationship of fasting C-peptide levels with corneal neuropathy evaluated by corneal confocal microscopy (CCM) in patients with T2DM. Methods. 160 T2DM patients (72 females) aged 34-78 with duration ranging from 0 to 40 years underwent CCM to measure corneal nerve fiber length (CNFL), corneal nerve fiber density (CNFD), and corneal nerve branch density (CNBD). Pearson correlation analysis and multiple linear regression analysis were used to explore the association of fasting C-peptide levels with corneal nerve parameters. Partial correlation analysis (adjusted for age and gender) was also conducted to analyze the correlation of metabolic indexes with these three corneal nerve parameters. The relationship between fasting C-peptide levels and duration of diabetes was also explored by Pearson correlation analysis. Results. With an increase in fasting C-peptide levels, the values of CNFL, CNFD, and CNBD also showed a corresponding trend for an increase. Partial correlation analysis revealed that fasting C-peptide levels were positively associated with CNFL (r=0.245, P=0.002), CNFD (r=0.180, P=0.024), and CNBD (r=0.214, P=0.008) after adjusting for age and gender. Using multiple linear regression analysis, fasting C-peptide levels were also closely associated with CNFL (P=0.047) and CNBD (P=0.038) after multiple adjustments. However, this association disappeared after further adjusting for duration of diabetes. Further analysis indicated that fasting C-peptide levels declined with duration of diabetes (r=−0.267, P=0.001). Conclusions. C-peptide was closely associated with corneal neuropathy and disease duration in T2DM. C-peptide levels might be both an indicator of beta-cell function and a marker of disease severity (such as diabetic corneal neuropathy) and duration.http://dx.doi.org/10.1155/2020/8883736 |
| spellingShingle | Anju Zuo Chuan Wang Lili Li Jingru Qu Juan Cao Li Chen Solomon Tesfaye Wenjuan Li Xinguo Hou The Association of Fasting C-peptide with Corneal Neuropathy in Patients with Type 2 Diabetes Journal of Diabetes Research |
| title | The Association of Fasting C-peptide with Corneal Neuropathy in Patients with Type 2 Diabetes |
| title_full | The Association of Fasting C-peptide with Corneal Neuropathy in Patients with Type 2 Diabetes |
| title_fullStr | The Association of Fasting C-peptide with Corneal Neuropathy in Patients with Type 2 Diabetes |
| title_full_unstemmed | The Association of Fasting C-peptide with Corneal Neuropathy in Patients with Type 2 Diabetes |
| title_short | The Association of Fasting C-peptide with Corneal Neuropathy in Patients with Type 2 Diabetes |
| title_sort | association of fasting c peptide with corneal neuropathy in patients with type 2 diabetes |
| url | http://dx.doi.org/10.1155/2020/8883736 |
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