Review Article

The Great Healing Potential Hidden in Plant Preparations of Antioxidant Properties: A Return to Nature?

Table 16

The protective effects of plant origin materials in animal models of diabetes.

ReferencePlant extract, dose, way and time of treatment, and animalsInducing factor and negative effectsProtective effects of plant materialEffects of plant per se

Ben Salem et al. [128]Cynara scolymus leaves
75% ethanol extract
200 or 400 mg/kg b.w. daily, p.o., for 28 days
Male Wistar rats, 10-12-week-old, 160–200 g
Alloxan monohydrate-induced diabetes, a single dose 150 mg/kg b.w., i.p.
Body weight gain: ↓
Blood glucose: ↑
Serum: α-amylase, pancreatic lipase, ALT, AST, ALP, urea, CR ↑
Plasma: TG, TC, LDL-c ↑, HDL-c ↓
Blood: RBC, WBC, HGB, PLT ↓
Liver: SOD, CAT, GSH ↓, MDA, AOPP ↑
Pancreas: SOD, CAT, GSH ↓, MDA, AOPP ↑
Kidney: SOD, CAT, GSH ↓, MDA, AOPP ↑
Body weight gain: (+++ both doses)
Blood glucose: (+++ 200, ++ 400)
Serum: ALP (++ both doses), urea (++ 200, +++ 400), CR (+++ 200, ++ 400), ALT, AST, α-amylase, pancreatic lipase (+++ both doses)
Plasma: TG, TC, LDL-c, HDL-c (+++ both doses)
Blood: WBC (0 200, ++ 400), PLT (++ both doses), RBC and HGB (+++ both doses)
Liver: MDA, SOD, CAT, AOPP (+++ both doses), GSH (+++ 200, ↑ 400)
Pancreas: SOD (++ both doses), MDA, CAT (+++ 200, ++ 400), GSH, AOPP (+++ both doses)
Kidney: SOD (+ 200, ++ 400), CAT (+++ 200, ++ 400), GSH, MDA, AOPP (+++ both doses)
Not studied

Dra et al. [127]Caralluma europaea aerial part extract obtained by successive extraction with dichloromethane and methanol
250 or 500 mg/kg b.w., p.o., a single dose, followed for 10 h
Swiss albino mice, 8 weeks
Alloxan monohydrate-induced diabetes type 1, a single dose of 200 mg/kg b.w., i.p.
Blood: glucose ↑
Islets diameter: ↓
The lower dose:
Blood glucose: after 2, 4, and 6 h (++), after8 h (+++) and after 10 h (↓); islet diameter (++)
The higher dose:
Blood glucose: after 2 (++), after 4 and 6 h (+++), after 8 and 10 h (↓)
Not studied

Silva et al. [59]Musa × paradisiaca L. green banana pasta
Commercial feed containing 25, 50, or 75% of green banana pasta, for 12 weeks
Male Wistar rats, 6-8 weeks old, 180-300 g
Alloxan-induced diabetes, type 1, i.p., a single dose of 150 mg/kg
Serum: glucose, ALT, AST, TC, TG, fructosamine ↑
Liver: total lipids, LPO and PC ↑
Kidney: PC ↑
Serum: AST (0 all doses), glucose, fructosamine (+ 25 and 50, +++ 75), TC (0 25, +++ 50, 0 75), ALT (0 25, +++ 50 and 75), TG (+++ all doses)
Liver: total lipids (+ 25 and 50, +++ 75), LPO (0 25, +++ 50, ↓ 75), PC (0 25, ++ 50, +++ 75)
Kidney: PC (0 25, +++ 50, ↓ 75)
Not studied

Du et al. [66]Polysaccharide separated from Lycium barbarum
100, 250, or 500 mg/kg, p.o., for 4 weeks
Male Sprague Dawley rats 8 weeks old, 180–220 g
High-fat diet for 8 weeks and then diabetes induced by streptozotocin injection, 30 mg/kg for a week
Fasting blood glucose: ↑
Serum: insulin, SOD, GPx ↓, BUN, IL-2, IL-6, TNF-α, INF-α, MCP-1, ICAM-1 ↑
Urine: ALB ↑
Fasting blood glucose: (+ 100, ++ 250, and 500)
Serum: INF-α (0 100 and 250, ++ 500), insulin, IL-2, ICAM-1 (0 100, + 250, ++ 500), SOD, TNF-α, BUN (0 100, + 250, +++ 500), GPx, IL-6 (0 100, +++ 250 and 500), MCP-1 (+ 250, +++ 250 and 500)
Urine: ALB (+ 250, ++ 250 and 500)
Not studied

Wattanathorn et al. [42]The combination of 50% hydroalcoholic extracts of Mangifera indica L. seeds and Polygonum odoratum L. aerial parts prepared at a ratio 1 : 5
2, 10, or 50 mg/kg b.w., daily, for 10 weeks
Male Wistar rats, 180–220 g
Diabetes cataract and retinopathy induced by a single injection of streptozotocin
55 mg/kg b.w.
Blood glucose after 5 and 10 weeks ↑
Grade of cataract severity ↑
Total retinal thickness ↓
Lens: SOD, CAT, GPx ↓, MDA, VEGF, ERK1/2, p38MAPK, AR ↑
Lens: opacity index ↑
Blood glucose after 5 weeks: (+ 2 and 50, ++ 10)
Blood glucose after 10 weeks: (+ 2, 0 10, - 50)
Total retinal thickness: (++ 2 and 10, 0 50)
Grade of cataract severity: (++ all doses)
Lens: SOD (++ 2, + 10, - 50), MDA (++ 2 and 10, 0 50), GPx (+ 2 and 50, ++ 10), CAT, AR, ERK1/2, p38MAPK (++ all doses), VEGF (+ 2, ++ 10, +++ 50)
Lens: opacity index (++ all doses)
Not studied

Balbaa et al. [57]Nigella sativa seed oil
2.0 mL/kg b.w., i.g., for 21 days after diabetes development
Male Wistar rats, about 125 g
Type 2 diabetes induced by a high-fat diet for 2 weeks, followed by a single injection of streptozotocin 35 mg/kg, i.p.
Serum: TNF-α, IL-6, AGE ↑
Brain: TBARS, XO, NO, TNF-α, IL-6, IL-1β, iNOS, AGE, AChE, Aβ-42, IDE ↑, GSH, GPx, GST, SOD, glucose ↓
Serum: TNF-α, IL-6 (+++), AGE ↓
Brain: AChE (↓), TBARS, XO, IL-6, IL-1β (++), NO, TNF-α, iNOS, GSH, GST, SOD, AGE, Aβ-42, IDE, glucose (+++), GPx (↑)
Serum: IL-6 and AGE ↓
Brain: AChE and Aβ-42 ↓, TBARS, NO, IDE, GPx, GST, SOD ↑

Fajri et al. [131]Equisetum arvense aerial parts, methanolic extract
250 or 500 mg/kg b.w., daily p.o., for 45 days after diabetes inducing
Male mice, 6-8 weeks
Streptozotocin-induced diabetes,
50 mg/kg b.w. i.p., for 5 days
Sperm: viability, motility ↓, percentage of morphological abnormalities, DNA damage and nuclear immaturity ↑
The lower dose: viability, percentage of morphological abnormalities and DNA damage (++), motility and percentage of nuclear immaturity (+++)
The higher dose: viability, motility (++), percentage of morphological abnormalities, DNA damage and nuclear immaturity (+++)
Not studied

Khanra et al. [129]Abroma augusta L. leaf methanol extract
100 or 200 mg/kg, p.o., daily for 4 weeks
Male Wistar rats, 2–3-month-old, about 180 g
Type 2 diabetes induced by a single injection of streptozotocin 65 mg/kg i.p., 15 min later nicotinamide 110 mg/kg, i. p.
Fasting blood glucose: ↑
Serum: HDL-c, insulin ↓, TC, TG, HbA1c, ALT, AST, urea, LDH, CK, CRP ↑
Kidney: DNA fragmentation, ROS, TBARS, PC, IL-1β, IL-6, TNF-α, ↑, total coenzymes Q9 and Q10, GSH, CAT, SOD, GST, GPx, GR, G6PD, ATP, Bcl-2/Bax ↓
Kidney: expression of NF-κB,
PKC (α, β, δ, ε), caspase 3, caspase 9 ↑
Heart: ROS, TBARS, PC, IL-1β, IL-6, TNF-α, GPx, GR, DNA fragmentation ↑, total coenzymes Q9 and Q10, GSH, CAT, SOD, GST, G6PD, ATP, Bcl-2/Bax ↓
Heart: expression of NF-κB, caspase 3, caspase 9, PKC (α, β, δ, ε) ↑
Fasting blood glucose: (++ both doses
Serum: TC, TG, HbA1c, ALT, AST, urea, LDH, CK, CRP, insulin (++ both doses), HDL-c (++ 100, +++ 200)
Kidney: ROS, TBARS, PC, total coenzyme Q9, SOD, IL-1β, IL-6, TNF-α, DNA fragmentation, ATP and Bcl-2/Bax (++ both doses), total coenzyme Q10, GSH, GST, GPx, GR, G6PD (++ 100, +++ 200), CAT (+++ both doses)
Kidney: expression of NF-κB, PKC (α, β, δ, ε), caspase 3, caspase 9 (++ both doses)
Heart: ROS, TBARS, PC, GSH, CAT, SOD, IL-1β, IL-6, TNF-α, ATP, Bcl-2/Bax, DNA fragmentation (++ both doses), GST, G6PD (++ 100, +++ 200), total coenzymes Q9 and Q10 (+++ both doses), GPx, GR (↑ both doses)
Heart: expression of PKC (α, β, δ, ε), caspase 3, caspase 9 (++ both doses), NF-κB (+++ both doses)
Not studied

Omodanisi et al. [130]Moringa oleifera leaf extract obtained by successive extraction with n-hexane and 80% methanol, 250 mg/kg b.w., p.o., for 6 weeks
Male Wistar rats, 10 weeks
Streptozotocin-induced diabetes, a single dose of 55 mg/kg, i.p.
Plasma: glucose ↑
Serum: TP, ALB ↓
Kidney: weight and relative weight ↑
Kidney: GPx, SOD slightly ↓, CAT ↓, TNF-α slightly↑,
MDA, IL-6 ↑
Plasma: glucose (++)
Serum: ALB (+), TP (+++)
Kidney: weight and relative weight (++)
Kidney: GPx (-), CAT (0), TNF-α, IL-6 (+), SOD (++), MDA (+++)
Plasma: glucose ↓
Serum: TP, ALB ↑
Kidney: SOD ↑, GPx, IL-6, TNF-α

↓: a decrease vs. control; ↑: an increase vs. control; (+): a slight beneficial effect; (++): a distinct beneficial effect; (+++): a complete beneficial effect; (0): no beneficial effect; (-): intensification of the harmful effect.